1
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Bertoli D, Mark EB, Liao D, Brock C, Frøkjaer JB, Drewes AM. A novel MRI-based three-dimensional model of stomach volume, surface area, and geometry in response to gastric filling and emptying. Neurogastroenterol Motil 2023; 35:e14497. [PMID: 36416084 PMCID: PMC10078211 DOI: 10.1111/nmo.14497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 09/29/2022] [Accepted: 10/20/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Gastric motility and accommodation have a critical role in maintaining normal gastrointestinal homeostasis. Different modalities can be adopted to quantify those processes, that is, scintigraphy to measure emptying time and intragastric Barostat for accommodation assessment. However, magnetic resonance imaging (MRI) can assess the same parameters noninvasively without ionizing radiation. Our study aimed to develop a detailed three-dimensional (3D) MRI model of the stomach to describe gastric volumes, surface areas, wall tension distribution, and interobserver agreement. METHODS Twelve healthy volunteers underwent an MRI protocol of six axial T2-weighted acquisitions. Each dataset was used to construct a 3D model of the stomach: First, the volumes of the whole stomach, gastric liquid, and air were segmented. After landmark placing, a raw 3D model was generated from segmentation data. Subsequently, irregularities were removed, and the model was divided into compartments. Finally, surface area and 3D geometry parameters (inverse curvatures) were extracted. The inverse curvatures were used as a proxy for wall tension distribution without measuring the intragastric pressure. KEY RESULTS The model was able to describe changes in volume and surface geometry for each compartment with a distinct pattern in response to filling and emptying. The surface tension was distributed nonhomogeneously between compartments and showed dynamical changes at various time points. CONCLUSION & INFERENCES The presented model offers a detailed tool for evaluating gastric volumes, surface geometry, and wall tension in response to filling and emptying and will provide insights into gastric emptying and accommodation in diseases such as diabetic gastroparesis.
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Affiliation(s)
- Davide Bertoli
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Esben Bolvig Mark
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Donghua Liao
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Christina Brock
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Jens Brøndum Frøkjaer
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Department of Radiology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn Mohr Drewes
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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2
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Gholamrezaei A, Van Diest I, Aziz Q, Pauwels A, Tack J, Vlaeyen JWS, Van Oudenhove L. Effect of slow, deep breathing on visceral pain perception and its underlying psychophysiological mechanisms. Neurogastroenterol Motil 2022; 34:e14242. [PMID: 34378834 DOI: 10.1111/nmo.14242] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 07/09/2021] [Accepted: 07/22/2021] [Indexed: 01/09/2023]
Abstract
BACKGROUND Studies using somatic pain models have shown the hypoalgesic effects of slow, deep breathing. We evaluated the effect of slow, deep breathing on visceral pain and explored putative mediating mechanisms including autonomic and emotional responses. METHODS Fifty-seven healthy volunteers (36 females, mean age = 22.0 years) performed controlled, deep breathing at a slow frequency (6 breaths per minute), controlled breathing at a normal frequency (14 breaths per minute; active control), and uncontrolled breathing (no-treatment control) in randomized order. Moderate painful stimuli were given during each condition by delivering electrical stimulation in the distal esophagus. Participants rated pain intensity after each stimulation. Heart rate variability and self-reported arousal were measured during each condition. KEY RESULTS Compared to uncontrolled breathing, pain intensity was lower during slow, deep breathing (Cohen's d = 0.40) and normal controlled breathing (d = 0.47), but not different between slow, deep breathing and normal controlled breathing. Arousal was lower (d = 0.53, 0.55) and heart rate variability was higher (d = 0.70, 0.86) during slow, deep breathing compared to the two control conditions. The effect of slow, deep breathing on pain was not mediated by alterations in heart rate variability or arousal but was moderated by pain catastrophizing. CONCLUSIONS AND INFERENCES Slow, deep breathing can reduce visceral pain intensity. However, the effect is not specific to the slow breathing frequency and is not mediated by autonomic or emotional responses, suggesting other underlying mechanisms (notably distraction). Whether a long-term practice of slow, deep breathing can influence (clinical) visceral pain warrants to be investigated.
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Affiliation(s)
- Ali Gholamrezaei
- Laboratory for Brain-Gut Axis Studies (LaBGAS), Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium.,Health Psychology Research Group, KU Leuven, Leuven, Belgium.,Pain Management Research Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Ilse Van Diest
- Health Psychology Research Group, KU Leuven, Leuven, Belgium
| | - Qasim Aziz
- Centre for Neuroscience and Trauma, Blizard Institute, Wingate Institute of Neurogastroeneterology, Queen Mary University of London, London, UK
| | - Ans Pauwels
- Gastrointestinal Sensitivity and Motility Research Group, Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium
| | - Jan Tack
- Gastrointestinal Sensitivity and Motility Research Group, Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium
| | - Johan W S Vlaeyen
- Health Psychology Research Group, KU Leuven, Leuven, Belgium.,Experimental Health Psychology, Maastricht University, Maastricht, The Netherlands
| | - Lukas Van Oudenhove
- Laboratory for Brain-Gut Axis Studies (LaBGAS), Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases, Metabolism and Ageing, KU Leuven, Leuven, Belgium
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3
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Phillips AE, Faghih M, Singh VK, Olesen SS, Kuhlmann L, Novovic S, Bick B, Hart PA, Ramsey ML, Talukdar R, Garg PK, Yadav D, Drewes AM. Rationale for and Development of the Pancreatic Quantitative Sensory Testing Consortium to Study Pain in Chronic Pancreatitis. Pancreas 2021; 50:1298-1304. [PMID: 34860815 DOI: 10.1097/mpa.0000000000001912] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVES Abdominal pain is the primary symptom of chronic pancreatitis (CP), but pain is difficult to assess, and objective methods for pain assessment are lacking. The characterization of the sensory component of pain as a surrogate for nociception can be achieved by sensory testing using standardized stimuli. Herein, we describe the rationale for and development of an international consortium to better understand and characterize CP pain. METHODS A collaboration was initially formed between the University of Aalborg, Johns Hopkins University, and the University of Pittsburgh. This group refined the protocol for pancreatic quantitative sensory testing (P-QST) and then expanded the collaboration with plans for incorporating P-QST into prospective studies. RESULTS The collaboration has successfully developed a P-QST nomogram. Chronic pancreatitis patients identified with P-QST as having widespread hyperalgesia had higher pain intensity scores, higher prevalence of constant pain, and decreased quality of life. Psychiatric comorbidities were independent of pain phenotypes. Multiple studies are underway to validate these findings and evaluate their utility in clinical trials. CONCLUSIONS Development of the P-QST Consortium will facilitate collaborative efforts to use P-QST as a means for evaluation and characterization of pain in CP patients, and optimize methods to guide individualized pain management approaches.
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Affiliation(s)
- Anna Evans Phillips
- From the Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Mahya Faghih
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Vikesh K Singh
- Division of Gastroenterology and Hepatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | | | | | - Srdan Novovic
- Pancreatitis Centre Copenhagen, Gastrounit, Hvidovre Hospital, Copenhagen, Denmark
| | - Benjamin Bick
- Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | - Philip A Hart
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Mitchell L Ramsey
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Rupjyoti Talukdar
- Department of Gastroenterology, Asian Institute of Gastroenterology, Hyderabad
| | - Pramod K Garg
- Department of Gastroenterology, All India Institute of Medical Sciences, New Delhi, India
| | - Dhiraj Yadav
- From the Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA
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4
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Hansen TM, Frøkjaer JB, Mark EB, Drewes AM. Tapentadol and oxycodone reduce cingulate glutamate in healthy volunteers. Br J Clin Pharmacol 2021; 88:1358-1364. [PMID: 34427941 DOI: 10.1111/bcp.15050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 06/30/2021] [Accepted: 07/03/2021] [Indexed: 12/20/2022] Open
Abstract
Tapentadol and oxycodone are commonly used analgesics. Preclinical studies have shown that oxycodone modulates brain metabolites related to opioid pathways, whereas tapentadol also affects noradrenergic activity. However, knowledge about the function of the medications in the human brain is limited. The aim was to investigate effects of tapentadol and oxycodone on brain glutamate, the most important neurotransmitter in pain processing. Magnetic resonance spectroscopy was obtained in 21 healthy subjects from the anterior cingulate cortex, prefrontal cortex, and insula at baseline and after 14 days of treatment with either 50 mg tapentadol, 10 mg oxycodone (equipotent dose, both extended release) or placebo twice daily in a randomized double-blind cross-over study. Compared to baseline, decreased glutamate/creatine levels were identified in anterior cingulate cortex after tapentadol (1.26 ± 0.14 vs. 1.35 ± 0.18, P = .04) and oxycodone (1.26 ± 0.10 vs. 1.35 ± 0.12, P = .05) treatments, both with 7% reduction. This indicates that both analgesics modulate the glutamatergic system at the supraspinal level in humans.
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Affiliation(s)
- Tine Maria Hansen
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Jens Brøndum Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Esben Bolvig Mark
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn Mohr Drewes
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
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5
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Croosu SS, Frøkjaer JB, Drewes AM, Hansen TM. Tapentadol and oxycodone affect resting-state functional brain connectivity: A randomized, placebo-controlled trial. J Neuroimaging 2021; 31:956-961. [PMID: 34196442 DOI: 10.1111/jon.12902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/24/2021] [Accepted: 06/07/2021] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE The changes in functional brain connectivity induced by treatment with analgesics are poorly investigated. Unfortunately, results from clinical studies investigating treatments in patients with pain are often confounded by co-medication and comorbidity. Thalamus is central in sensory processing, and we hypothesized that functional connectivity between thalamus and other brain areas in healthy volunteers was different in treatment with oxycodone, representing a pure opioid, compared to treatment with tapentadol, which has a dual effect on the opioidergic and adrenergic systems. METHODS Twenty-one healthy male volunteers were included in a randomized, double-blind, three-armed, placebo-controlled, cross-over study. All received tapentadol (50 mg extended release), oxycodone (10 mg extended release), or placebo twice daily for 14 days. Resting-state functional magnetic resonance imaging data were obtained before and after treatment. Seed-based functional connectivity analyses were performed between thalamus and other brain regions. RESULTS Compared to placebo, tapentadol increased functional connectivity between left thalamus and precentral cortex (P = .048), whereas oxycodone decreased functional connectivity between bilateral thalamus and the anterior cingulate cortex (P ≤ .005). CONCLUSIONS This study has shown that the functional connectivity between thalamus and other brain areas central in pain processing was different for the tapentadol and oxycodone treatments compared to placebo. This supports that the two treatments exert different mechanism of action. Further studies with larger sample sizes need to be carried out in order to validate this.
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Affiliation(s)
- Suganthiya S Croosu
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Jens B Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Asbjørn M Drewes
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Tine M Hansen
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
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6
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Peihong M, Yuzhu Q, Tao Y, Zhaoxuan H, Shirui C, Yuke T, Kunnan X, Shenghong L, Ruirui S, Fang Z. Neuroimaging in the Understanding of Acupuncture Analgesia: A Review of Acupuncture Neuroimaging Study Based on Experimental Pain Models. Front Neurosci 2021; 15:648305. [PMID: 34093111 PMCID: PMC8172961 DOI: 10.3389/fnins.2021.648305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 04/06/2021] [Indexed: 11/13/2022] Open
Abstract
With the development of real-time and visualized neuroimaging techniques, the studies on the central mechanism of acupuncture analgesia gain increasing attention. The experimental pain models have been widely used in acupuncture-analgesia neuroimaging studies with quantitative and controlled advantages. This review aimed to analyze the study design and main findings of acupuncture neuroimaging studies to provide reference for future study. The original studies were collected and screened in English databases (PubMed, EMBASE, and Cochrane Library) and Chinese databases (Chinese Nation Knowledge Infrastructure, Chinese Biomedical Literature Database, the Chongqing VIP Database, and Wanfang Database). As a result, a total of 27 articles were included. Heat stimulation and electroacupuncture were the mostly used pain modeling method and acupuncture modality, respectively. The neuroimaging scanning process can be divided into two models and five subtypes. The anterior cingulate cortex and insula were the most commonly reported brain regions involved in acupuncture analgesia with experimental pain models.
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Affiliation(s)
- Ma Peihong
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Qu Yuzhu
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yin Tao
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - He Zhaoxuan
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Cheng Shirui
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Teng Yuke
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Xie Kunnan
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Li Shenghong
- State Key Laboratory of Southwestern Chinese Medicine Resources, Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Sun Ruirui
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Zeng Fang
- Acupuncture and Tuina School/The Third Teaching Hospital, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Acupuncture and Brain Science Research Center, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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7
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Mouraux A, Bannister K, Becker S, Finn DP, Pickering G, Pogatzki-Zahn E, Graven-Nielsen T. Challenges and opportunities in translational pain research - An opinion paper of the working group on translational pain research of the European pain federation (EFIC). Eur J Pain 2021; 25:731-756. [PMID: 33625769 PMCID: PMC9290702 DOI: 10.1002/ejp.1730] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
For decades, basic research on the underlying mechanisms of nociception has held promise to translate into efficacious treatments for patients with pain. Despite great improvement in the understanding of pain physiology and pathophysiology, translation to novel, effective treatments for acute and chronic pain has however been limited, and they remain an unmet medical need. In this opinion paper bringing together pain researchers from very different disciplines, the opportunities and challenges of translational pain research are discussed. The many factors that may prevent the successful translation of bench observations into useful and effective clinical applications are reviewed, including interspecies differences, limited validity of currently available preclinical disease models of pain, and limitations of currently used methods to assess nociception and pain in non-human and human models of pain. Many paths are explored to address these issues, including the backward translation of observations made in patients and human volunteers into new disease models that are more clinically relevant, improved generalization by taking into account age and sex differences, and the integration of psychobiology into translational pain research. Finally, it is argued that preclinical and clinical stages of developing new treatments for pain can be improved by better preclinical models of pathological pain conditions alongside revised methods to assess treatment-induced effects on nociception in human and non-human animals. Significance: For decades, basic research of the underlying mechanisms of nociception has held promise to translate into efficacious treatments for patients with pain. Despite great improvement in the understanding of pain physiology and pathophysiology, translation to novel, effective treatments for acute and chronic pain has however been limited, and they remain an unmet medical need.
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Affiliation(s)
- André Mouraux
- Institute of Neuroscience (IONS), UCLouvain, Brussels, Belgium
| | - Kirsty Bannister
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Susanne Becker
- Department of Cognitive and Clinical Neuroscience, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.,Integrative Spinal Research, Department of Chiropractic Medicine, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
| | - David P Finn
- Pharmacology and Therapeutics, Centre for Pain Research, School of Medicine, National University of Ireland Galway, Galway, Ireland
| | - Gisèle Pickering
- Department of Clinical Pharmacology, Inserm CIC 1405, University Hospital, CHU Clermont-Ferrand, France.,Fundamental and Clinical Pharmacology of Pain, University Clermont Auvergne, Clermont-Ferrand, France
| | - Esther Pogatzki-Zahn
- Department of Anesthesiology, Critical Care Medicine and Pain Therapy, University Hospital Muenster, Muenster, Germany
| | - Thomas Graven-Nielsen
- Center for Neuroplasticity and Pain (CNAP), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
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8
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Siebenga PS, van Amerongen G, Okkerse P, Denney WS, Dua P, Butt RP, Hay JL, Groeneveld GJ. Reproducibility of a battery of human evoked pain models to detect pharmacological effects of analgesic drugs. Eur J Pain 2019; 23:1129-1140. [PMID: 30793411 PMCID: PMC6618124 DOI: 10.1002/ejp.1379] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 02/01/2019] [Accepted: 02/17/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Although reproducibility is considered essential for any method used in scientific research, it is investigated only rarely; thus, strikingly little has been published regarding the reproducibility of evoked pain models involving human subjects. Here, we studied the reproducibility of a battery of evoked pain models for demonstrating the analgesic effects of two analgesic compounds. METHODS A total of 81 healthy subjects participated in four studies involving a battery of evoked pain tests in which mechanical, thermal and electrical stimuli were used to measure pain detection and tolerance thresholds. Pharmacodynamic outcome variables were analysed using a mixed model analysis of variance, and a coefficient of variation was calculated by dividing the standard deviation by the least squares means. RESULTS A total of 76 subjects completed the studies. After being administered pregabalin, the subjects' pain tolerance thresholds in the cold pressor and pressure stimulation tests were significantly increased compared to the placebo group. Moreover, the heat pain detection threshold in UVB-irradiated skin was significantly increased in subjects who were administered ibuprofen compared to the placebo group. Variation among all evoked pain tests ranged from 2.2% to 30.6%. CONCLUSIONS Four studies using a similar design showed reproducibility with respect to the included evoked pain models. The relatively high consistency and reproducibility of two analgesics at doses known to be effective in treating clinically relevant pain supports the validity of using this pain test battery to investigate the analgesic activity and determine the active dosage of putative analgesic compounds in early clinical development. SIGNIFICANCE The consistency and reproducibility of measuring the profile of an analgesic at clinically relevant doses illustrates that this pain test battery is a valid tool for demonstrating the analgesic activity of a test compound and for determining the optimal active dose in early clinical drug development.
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Affiliation(s)
| | | | | | - William S. Denney
- Pfizer Inc.CambridgeMassachusetts
- Present address:
Human Predictions LLCCambridgeMassachusetts
| | | | | | | | - Geert J. Groeneveld
- Centre for Human Drug ResearchLeidenThe Netherlands
- Leiden University Medical CenterLeidenThe Netherlands
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9
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Broers C, Boecxstaens V, Deloose E, Tack J, Pauwels A. The optimal order of stimulation modalities and reproducibility of the multimodal esophageal stimulation paradigm. Neurogastroenterol Motil 2019; 31:e13475. [PMID: 30246470 DOI: 10.1111/nmo.13475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 08/22/2018] [Accepted: 08/28/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND Esophageal hypersensitivity can be triggered by different stimuli. We use a multimodal stimulation model to study esophageal sensitivity to four sensory modalities: thermal, mechanical, electrical, and chemical stimulation. The optimal order of these stimulations needs further validation. METHODS Esophageal sensitivity to thermal (heated saline solution), mechanical (balloon distention), electrical (block pulses with electrodes), and chemical stimulation (acid solution, 0.1 N HCl) was assessed in 10 subjects. In one session, thermal stimulation was performed first, followed by mechanical stimulation ("original protocol"). In a second session, mechanical stimulation was performed first, followed by temperature stimulation ("reversed protocol"). Besides, the impact of balloon distention speed (25 mL/min vs 50 mL/min) during mechanical stimulation was evaluated. Secondly, in order to establish reproducibility, independent control sessions of multimodal stimulations in 15 healthy volunteers were used retrospectively. KEY RESULTS A significant difference in pain perception threshold for thermal stimulation was found between the original and reversed protocol (P = 0.046), indicating that mechanical stimulation can sensitize the esophagus to thermal stimulation. Balloon distention rate had no impact on sensitivity thresholds for mechanical stimulation. Concerning the reproducibility, there were no differences for thermal, mechanical, electrical, and chemical stimulation in any of the control sessions. CONCLUSIONS The optimal order of the multimodal stimulation protocol was to start with the thermal stimulation, followed by mechanical, electrical, and chemical stimulation. The optimal balloon distention rate was 25 mL/min. Multimodal esophageal stimulation generates reproducible perception scores in health and therefore provides a reliable method to assess esophageal sensitivity changes after interventions that may alter esophageal sensitivity.
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Affiliation(s)
- Charlotte Broers
- Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
| | - Veerle Boecxstaens
- Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium.,Department of Oncology, Abdominal Surgical Oncology, KU Leuven, Leuven, Belgium
| | - Eveline Deloose
- Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
| | - Jan Tack
- Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium.,Department of Gastroenterology, Leuven University Hospitals, Leuven, Belgium
| | - Ans Pauwels
- Department of Chronic Diseases, Metabolism and Ageing (CHROMETA), Translational Research Center for Gastrointestinal Disorders (TARGID), KU Leuven, Leuven, Belgium
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10
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Olesen AE, Nissen TD, Nilsson M, Lelic D, Brock C, Christrup LL, Drewes AM. Offset Analgesia and The Impact of Treatment with Oxycodone and Venlafaxine: A Placebo-Controlled, Randomized Trial in Healthy Volunteers. Basic Clin Pharmacol Toxicol 2018; 123:727-731. [DOI: 10.1111/bcpt.13078] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 06/20/2018] [Indexed: 01/03/2023]
Affiliation(s)
- Anne E. Olesen
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
- Department of Clinical Medicine; Aalborg University; Aalborg Denmark
- Department of Drug Design and Pharmacology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - Thomas D. Nissen
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
| | - Matias Nilsson
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
| | - Dina Lelic
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
| | - Christina Brock
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
- Department of Clinical Medicine; Aalborg University; Aalborg Denmark
- Department of Drug Design and Pharmacology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - Lona L. Christrup
- Department of Drug Design and Pharmacology; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
| | - Asbjørn M. Drewes
- Mech-Sense; Department of Gastroenterology & Hepatology; Aalborg University Hospital; Aalborg Denmark
- Department of Clinical Medicine; Aalborg University; Aalborg Denmark
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11
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Hoff DAL, McMahon B, Gregersen H. Esophageal multimodal stimulation and sensation. Ann N Y Acad Sci 2018; 1434:210-218. [DOI: 10.1111/nyas.13730] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 03/16/2018] [Accepted: 03/21/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Dag Arne Lihaug Hoff
- Division of Gastroenterology and Hepatology, Department of Medicine, Ålesund HospitalMøre and Romsdal Hospital Trust Ålesund Norway
| | - Barry McMahon
- Trinity Academic Gastroenterology Group (TAGG)Trinity College and Tallaght Hospital Dublin Ireland
| | - Hans Gregersen
- Department of Surgerythe Chinese University of Hong Kong Shatin Hong Kong
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12
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Gregersen H, Lo KM. What Is the Future of Impedance Planimetry in Gastroenterology? J Neurogastroenterol Motil 2018; 24:166-181. [PMID: 29605974 PMCID: PMC5885717 DOI: 10.5056/jnm18013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 02/09/2018] [Indexed: 12/13/2022] Open
Abstract
The gastrointestinal (GI) tract is efficient in transporting ingested material to the site of delivery in healthy subjects. A fine balance exists between peristaltic forces, the mixing and delivery of the contents, and sensory signaling. This fine balance is easily disturbed by diseases. It is mandatory to understand the pathophysiology to enhance our understanding of GI disorders. The inaccessibility and complex nervous innervation, geometry and mechanical function of the GI tract make mechanosensory evaluation difficult. Impedance planimetry is a distension technology that assesses luminal geometry, mechanical properties including muscle dynamics, and processing of nociceptive signals from the GI tract. Since standardized models do not exist for GI muscle function in vivo, models, concepts, and terminology must be borrowed from other medical fields such as cardiac mechanophysiology. The review highlights the impedance planimetric technology, muscle dynamics assessment, and 3 applied technologies of impedance planimetry. These technologies are the multimodal probes that assesses sensory function, the functional luminal imaging probe that dynamically measures the geometry of the lumen it distends, and Fecobionics that is a simulated feces providing high-resolution measurements during defecation. The advanced muscle analysis and 3 applied technologies can enhance the quality of future interdisciplinary research for gaining more knowledge about mechanical function, sensory-motor disorders, and symptoms. This is a step in the direction of individualized treatment for GI disorders based on diagnostic subtyping. There seems to be no better alternatives to impedance planimetry, but only the functional luminal imaging probe is currently commercially available. Wider use depends on commercialization of the multimodal probe and Fecobionics.
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Affiliation(s)
- Hans Gregersen
- GIOME, Department of Surgery, The Chinese University of Hong Kong, Shatin, Hong Kong.,California Medical Innovations Institute, San Diego, California, USA
| | - Kar Man Lo
- GIOME Doublecove, Wu Kai Sha, New Territories, Hong Kong
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13
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Larsen IM, Drewes AM, Olesen AE. The Effect of a Combination of Diclofenac and Methadone Applied as Gel in a Human Experimental Pain Model - A Randomized, Placebo-controlled Trial. Basic Clin Pharmacol Toxicol 2018; 123:188-194. [PMID: 29498480 DOI: 10.1111/bcpt.12993] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 02/13/2018] [Indexed: 12/16/2022]
Abstract
Pain involves responses in which both peripheral and central mechanisms contribute to the generation of pain. Pre-clinical laboratory data have supported that a topical formulation of combined diclofenac and methadone (Diclometh) may alleviate local pain, and potentially, the side effect profile should be low. We hypothesized that antiallodynic and antihyperalgesic effects of Diclometh could be demonstrated in a human experimental pain model and that Diclometh would be safe to administer. Thus, the aims were as follows: (i) to compare two doses of Diclometh versus placebo; and (ii) to assess the safety profile of Diclometh. The study was a crossover, randomized, double-blind, placebo-controlled comparison of two doses of Diclometh gel (0.1% and 0.2%) administered topically in healthy participants. Nerve growth factor (NGF) and capsaicin intradermal injections were used as human pain models. Pressure stimulation, contact heat stimulation, hyperalgesia (pinprick stimulation) and allodynia (brush stimulation) to mechanical stimulation were performed in the area where capsaicin and NGF were injected. Side effects were recorded on a four-point Likert scale. Twenty-one men completed the study (mean age 26.14 ± 5.3). Diclometh 0.2% reduced the capsaicin-induced dynamic mechanical allodynia compared to placebo (primary end-point, p = 0.03). No other primary or secondary end-points were found significantly different (all p > 0.05). All side effects were reported as mild with no differences between treatments (p = 0.15). Indication of antiallodynic effect of Diclometh 0.2% was found. Additionally, it was demonstrated that Diclometh was safe to use.
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Affiliation(s)
- Isabelle M Larsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Anne E Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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14
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Grønlund D, Poulsen JL, Krogh K, Brock C, Liao D, Gregersen H, Drewes AM, Olesen AE. The impact of naloxegol on anal sphincter function - Using a human experimental model of opioid-induced bowel dysfunction. Eur J Pharm Sci 2018; 117:187-192. [PMID: 29432808 DOI: 10.1016/j.ejps.2018.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 01/23/2018] [Accepted: 02/06/2018] [Indexed: 01/01/2023]
Abstract
BACKGROUND AND AIMS Opioid treatment interferes with anal sphincter function and its regulation during defecation. This may result in straining, incomplete evacuation, and contribute to opioid-induced bowel dysfunction (OIBD). Employing an experimental model of oxycodone-induced OIBD, we hypothesized that co-administration of the peripherally acting μ-opioid antagonist naloxegol would improve anal sphincter function in comparison to placebo. METHODS In a double-blind randomized crossover trial, 24 healthy males were assigned to a six-day treatment of oral oxycodone 15 mg twice daily in combination with either oral naloxegol 25 mg once daily or placebo. At baseline and at day 6, anal resting pressure and the recto-anal inhibitory reflex (RAIR) were evaluated using manometry and rectal balloon distension. Furthermore, the functional lumen imaging probe was used to measure distensibility of the anal canal. Gastrointestinal symptoms were assessed with the Patient Assessment of Constipation Symptom (PAC-SYM) questionnaire and the Bristol Stool Form Scale. RESULTS During oxycodone treatment, naloxegol improved RAIR-induced sphincter relaxation by 15% (-45.9 vs -38.8 mm Hg; P < 0.01). No differences in anal resting pressure and anal canal distensibility were found between treatments (all P > 0.5). Naloxegol improved PAC-SYM symptoms (mean score over days; 2.6 vs 4.5, P < 0.001) and improved stool consistency scores (mean score over days; 3.3 vs 2.9, P < 0.01). CONCLUSIONS In this experimental model of OIBD, naloxegol improved the RAIR and reduced gastrointestinal symptoms. Hence, in contrast to conventional laxatives, naloxegol may regulate opioid-induced anal sphincter dysfunction and facilitate the defecation process.
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Affiliation(s)
- Debbie Grønlund
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Jakob L Poulsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Klaus Krogh
- Neurogastroenterology Unit, Department of Hepatology and Gastroenterology, Aarhus University Hospital, Aarhus, Denmark
| | - Christina Brock
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark; Department of Drug Design and Pharmacology, University of Copenhagen, Denmark
| | - Donghua Liao
- GIOME Academia, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Hans Gregersen
- GIOME, Department of Surgery, Chinese University of Hong Kong and Prince of Wales Hospital, Shatin, Hong Kong
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Anne E Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark; Department of Drug Design and Pharmacology, University of Copenhagen, Denmark.
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15
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Arendt‐Nielsen L, Morlion B, Perrot S, Dahan A, Dickenson A, Kress H, Wells C, Bouhassira D, Drewes AM. Assessment and manifestation of central sensitisation across different chronic pain conditions. Eur J Pain 2018; 22:216-241. [DOI: 10.1002/ejp.1140] [Citation(s) in RCA: 372] [Impact Index Per Article: 62.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
Abstract
AbstractDifferent neuroplastic processes can occur along the nociceptive pathways and may be important in the transition from acute to chronic pain and for diagnosis and development of optimal management strategies. The neuroplastic processes may result in gain (sensitisation) or loss (desensitisation) of function in relation to the incoming nociceptive signals. Such processes play important roles in chronic pain, and although the clinical manifestations differ across condition processes, they share some common mechanistic features. The fundamental understanding and quantitative assessment of particularly some of the central sensitisation mechanisms can be translated from preclinical studies into the clinic. The clinical perspectives are implementation of such novel information into diagnostics, mechanistic phenotyping, prevention, personalised treatment, and drug development. The aims of this paper are to introduce and discuss (1) some common fundamental central pain mechanisms, (2) how they may translate into the clinical signs and symptoms across different chronic pain conditions, (3) how to evaluate gain and loss of function using quantitative pain assessment tools, and (4) the implications for optimising prevention and management of pain. The chronic pain conditions selected for the paper are neuropathic pain in general, musculoskeletal pain (chronic low back pain and osteoarthritic pain in particular), and visceral pain (irritable bowel syndrome in particular). The translational mechanisms addressed are local and widespread sensitisation, central summation, and descending pain modulation.SignificanceCentral sensitisation is an important manifestation involved in many different chronic pain conditions. Central sensitisation can be different to assess and evaluate as the manifestations vary from pain condition to pain condition. Understanding central sensitisation may promote better profiling and diagnosis of pain patients and development of new regimes for mechanism based therapy. Some of the mechanisms underlying central sensitisation can be translated from animals to humans providing new options in development of therapies and profiling drugs under development.
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Affiliation(s)
| | - B. Morlion
- The Leuven Centre for Algology University Hospitals Leuven University of Leuven Belgium
| | - S. Perrot
- INSERM U987 Pain Center Cochin Hospital Paris Descartes University Paris France
| | - A. Dahan
- Department of Anesthesiology Leiden University Medical Center Leiden The Netherlands
| | - A. Dickenson
- Neuroscience Physiology & Pharmacology University College London UK
| | - H.G. Kress
- Department of Special Anaesthesia and Pain Therapy Medizinische Universität/AKH Wien Vienna Austria
| | | | - D. Bouhassira
- INSERM U987 Centre d'Evaluation et de Traitement de la Douleur Hôpital Ambroise Paré Boulogne Billancourt France
| | - A. Mohr Drewes
- Mech‐Sense Department of Gastroenterology and Hepatology Clinical Institute Aalborg University Hospital Aalborg Denmark
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16
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Gram M, Erlenwein J, Petzke F, Falla D, Przemeck M, Emons MI, Reuster M, Olesen SS, Drewes AM. The cortical responses to evoked clinical pain in patients with hip osteoarthritis. PLoS One 2017; 12:e0186400. [PMID: 29084278 PMCID: PMC5662082 DOI: 10.1371/journal.pone.0186400] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 09/29/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Experimental models have been used extensively to evaluate pain using e.g., visual analogue scales or electroencephalography (EEG). Stimulation using tonic pain has been shown to better mimic the unpleasantness of chronic pain, but has mainly been evoked by non-clinical stimuli. This study aims to, evaluate the EEG during clinical pain in patients scheduled for total hip replacement with control and resting conditions. METHODS The hip scheduled for replacement was moved by the examiner to evoke pain for 30 seconds while recording EEG. The control condition entailed movement of the opposite hip in a similar fashion and holding it for 30 seconds. In addition, EEG was recorded during the resting condition with open eyes. The relative spectral content was calculated from the EEG as well as functional connectivity using phase-lag index for frequency bands delta (1-4Hz), theta (4-8Hz), alpha (8-12Hz) and beta (12-32Hz). A mixed model was used for statistical comparison between the three recording conditions. RESULTS Spectral content differed between conditions in all bands. Functional connectivity differed in delta and theta frequency bands. Post-hoc analysis revealed differences between the painful and control condition in delta, theta and beta for spectral content. Pain during the hip rotation was correlated to the theta (r = -0.24 P = 0.03) and beta (r = 0.25 P = 0.02) content in the EEG. CONCLUSION EEG differences during hip movements in the affected and unaffected hip appeared in the spectral beta and theta content. This was correlated to the reported pain perceived, pointing towards pain specific brain activity related to clinical pain.
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Affiliation(s)
- Mikkel Gram
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
- Coaze IVS, Aalborg, Denmark
| | - Joachim Erlenwein
- Pain Clinic, Department of Anesthesiology, University Hospital, Georg-August-University of Göttingen; Göttingen, Germany
| | - Frank Petzke
- Pain Clinic, Department of Anesthesiology, University Hospital, Georg-August-University of Göttingen; Göttingen, Germany
| | - Deborah Falla
- Pain Clinic, Department of Anesthesiology, University Hospital, Georg-August-University of Göttingen; Göttingen, Germany
| | - Michael Przemeck
- Department of Anesthesiology and Intensive Care, Annastift, Hannover, Germany
| | - Miriam I. Emons
- Pain Clinic, Department of Anesthesiology, University Hospital, Georg-August-University of Göttingen; Göttingen, Germany
| | - Michael Reuster
- Pain Clinic, Department of Anesthesiology, University Hospital, Georg-August-University of Göttingen; Göttingen, Germany
| | - Søren S. Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn M. Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
- Clinical Institute, Aalborg University Hospital, Aalborg, Denmark
- * E-mail:
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17
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Hansen TM, Mark EB, Olesen SS, Gram M, Frøkjær JB, Drewes AM. Characterization of cortical source generators based on electroencephalography during tonic pain. J Pain Res 2017; 10:1401-1409. [PMID: 28652806 PMCID: PMC5476635 DOI: 10.2147/jpr.s132909] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Objective The aim of the present study was to characterize the cortical source generators evoked by experimental tonic pain. Methods Electroencephalography (EEG) was recorded on two separate days during rest and with immersion of the hand in ice water for 2 minutes (cold pressor test). Exact low-resolution brain electromagnetic tomography source localization was performed in 31 healthy volunteers to characterize the cortical source generators. Results Reliability was high in all eight frequency bands during rest and cold pressor conditions (intraclass coefficients =0.47–0.83 in the cingulate and insula). Tonic pain increased cortical activities in the delta (1–4 Hz), theta (4–8 Hz), beta1 (12–18 Hz), beta2 (18–24 Hz), beta3 (24–32 Hz), and gamma (32–60 Hz) bands (all P<0.011) in widespread areas mainly in the limbic system, whereas decreased cortical activities were found in cingulate and pre- and postcentral gyri in the alpha2 (10–12 Hz) band (P=0.007). The pain intensity was correlated with cingulate activity in the beta2, beta3, and gamma bands (all P<0.04). Conclusion Source localization of EEG is a reliable method to estimate cortical source generators. Activities in different brain regions, mainly in the limbic system, showed fluctuations in various frequency bands. Cingulate changes were correlated with pain intensity. Significance This method might add information to the objective assessment of the cortical pain response in future experimental pain studies.
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Affiliation(s)
- Tine Maria Hansen
- Mech-Sense, Department of Radiology, Aalborg University Hospital.,Department of Clinical Medicine, Aalborg University
| | - Esben Bolvig Mark
- Mech-Sense, Department of Radiology, Aalborg University Hospital.,Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Søren Schou Olesen
- Department of Clinical Medicine, Aalborg University.,Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Mikkel Gram
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Jens Brøndum Frøkjær
- Mech-Sense, Department of Radiology, Aalborg University Hospital.,Department of Clinical Medicine, Aalborg University
| | - Asbjørn Mohr Drewes
- Department of Clinical Medicine, Aalborg University.,Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
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18
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Broers C, Melchior C, Van Oudenhove L, Vanuytsel T, Van Houtte B, Scheerens C, Rommel N, Tack J, Pauwels A. The effect of intravenous corticotropin-releasing hormone administration on esophageal sensitivity and motility in health. Am J Physiol Gastrointest Liver Physiol 2017; 312:G526-G534. [PMID: 28336550 DOI: 10.1152/ajpgi.00437.2016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 03/09/2017] [Accepted: 03/13/2017] [Indexed: 02/08/2023]
Abstract
Esophageal hypersensitivity is important in gastroesophageal reflux disease (GERD) patients who are refractory to acid-suppressive therapy. Stress affects visceral sensitivity and exacerbates heartburn in GERD. Peripheral CRH is a key mediator of the gut stress response. We hypothesize that CRH increases esophageal sensitivity and alters esophageal motility in health. Esophageal sensitivity to thermal, mechanical, electrical, and chemical stimuli was assessed in 14 healthy subjects after administration of placebo or CRH (100 μg iv). Perception scores were assessed for first perception, pain perception threshold (PPT), and pain tolerance threshold (PTT). Esophageal motility was investigated by high-resolution impedance manometry, before and after CRH and evaluated by distal contractile integral (DCI) and intrabolus pressure (IBP). Pressure flow analysis assessed bolus clearance (impedance ratio), degree of pressurization needed to propel bolus onward (IBP slope), and pressure flow (pressure flow index, PFI). Stress and mood were assessed during the study. Sensitivity to mechanical distention was increased after CRH compared with placebo (PPT: P = 0.0023; PTT: P = 0.0253). CRH had no influence on the other stimulations. DCI was increased for all boluses (liquid, P = 0.0012; semisolid, P = 0.0017; solid, P = 0.0107). Impedance ratio for liquid (P < 0.0001) and semisolid swallows (P = 0.0327) decreased after CRH. IBP slope increased after CRH for semisolid (P = 0.0041) and solid (P = 0.0003) swallows. PFI increased for semisolid (P = 0.0017) and solid swallows (P = 0.0031). CRH increased esophageal sensitivity to mechanical distention, not to the other stimulation modalities. CRH increased esophageal contractility and tone, decreased LES relaxation, increased esophageal bolus pressurization, improved esophageal bolus clearance, and increased pressure flow.NEW & NOTEWORTHY This is the first study to address the effect of corticotropin-releasing hormone (CRH) on esophageal sensitivity and alterations in motility in health. CRH administration increased esophageal sensitivity to mechanical distention. This effect is accompanied by an increase in esophageal contractility and tone and a decrease in lower esophageal sphincter relaxation. CRH increased esophageal bolus pressurization, improved esophageal bolus clearance, and increased pressure flow. The changes in esophageal contractile properties may underlie the increased sensitivity to mechanical distention after CRH.
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Affiliation(s)
- Charlotte Broers
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium
| | - Chloé Melchior
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium.,Institut National de la Santé et de la Recherche Médicale, UMR 1073, Institute for Research and Innovation in Biomedicine, Normandy University, Rouen, France; and.,Physiology and Gastroenterology Department, Rouen University Hospital, France
| | - Lukas Van Oudenhove
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium
| | - Tim Vanuytsel
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium.,Department of Gastroenterology, Leuven University Hospitals, Leuven, Belgium
| | - Brecht Van Houtte
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium
| | - Charlotte Scheerens
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium.,Experimental Oto-Rhino-Laryngology, Department of Neurosciences, KU Leuven, Belgium
| | - Nathalie Rommel
- Experimental Oto-Rhino-Laryngology, Department of Neurosciences, KU Leuven, Belgium
| | - Jan Tack
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium; .,Department of Gastroenterology, Leuven University Hospitals, Leuven, Belgium
| | - Ans Pauwels
- Translational Research Center for Gastrointestinal Disorders, Department of Clinical and Experimental Medicine, KU Leuven, Belgium
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19
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Lottrup C, Krarup AL, Gregersen H, Ejstrud P, Drewes AM. Patients with Barrett's esophagus are hypersensitive to acid but hyposensitive to other stimuli compared with healthy controls. Neurogastroenterol Motil 2017; 29. [PMID: 27891754 DOI: 10.1111/nmo.12992] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 10/18/2016] [Indexed: 02/08/2023]
Abstract
BACKGROUND Esophageal hyposensitivity has been observed in Barrett's esophagus and may contribute to its pathophysiology. However, studies are few, in particular those assessing different sensory modalities. We aimed to compare esophageal sensitivity to multimodal stimulation in patients with Barrett's esophagus and in healthy controls. METHODS Twenty-three patients with Barrett's esophagus and 12 healthy controls were examined. A multimodal probe was placed in the lower esophagus. Mechanical, thermal, and electrical stimulation was applied followed by an acid perfusion test with 0.1 N hydrochloric acid. KEY RESULTS Compared with controls, patients were hyposensitive to mechanical distension, heat, and electrical stimulation (all P<.05), but hypersensitive to acid (mean tolerated acid volume 57% lower, P=.001). A linear correlation between acid hypersensitivity and lower baseline impedance was found (P<.001). Patients had longer esophageal acid exposure time than controls (median acid exposure time 18 vs 5%, P=.03). Asymptomatic patients (no reflux symptoms at baseline) were hyposensitive to mechanical distension, electrical stimulation, and acid perfusion (all P<.05) compared with symptomatic patients. CONCLUSIONS & INFERENCES Patients with Barrett's esophagus exhibited acid hypersensitivity but hyposensitivity to other stimuli. Lower mucosal baseline impedance, a likely surrogate marker for impaired mucosal integrity, may explain the selective hypersensitivity to acid. On the other hand, the concurrent hyposensitivity may theoretically be explained by changes in central pain modulation. Patients with Barrett's esophagus seem to compose symptomatic and asymptomatic subgroups, showing different esophageal sensory profiles.
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Affiliation(s)
- C Lottrup
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Department of Medicine, North Denmark Regional Hospital, Hjørring, Denmark
| | - A L Krarup
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Medicine, North Denmark Regional Hospital, Hjørring, Denmark
| | - H Gregersen
- GIOME, Department of Surgery, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, Hong Kong SAR
| | - P Ejstrud
- Department of Surgery, Aalborg University Hospital, Aalborg, Denmark
| | - A M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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20
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Nielsen LM, Christrup LL, Sato H, Drewes AM, Olesen AE. Genetic Influences of OPRM1, OPRD1 and COMT on Morphine Analgesia in a Multi-Modal, Multi-Tissue Human Experimental Pain Model. Basic Clin Pharmacol Toxicol 2017; 121:6-12. [PMID: 28084056 DOI: 10.1111/bcpt.12757] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 01/06/2017] [Indexed: 12/18/2022]
Abstract
Human studies on experimentally induced pain are of value to elucidate the genetic influence on morphine analgesia under controlled conditions. The aim of this study was to investigate whether genetic variants of mu-, kappa- and delta-opioid receptor genes (OPRM1, OPRK1 and OPRD1) and catechol-O-methyltransferase gene (COMT) are associated with the morphine analgesia. The study was a randomized, double-blind, two-way, crossover, single-dose study conducted in 40 healthy participants, where morphine was compared with placebo. Pain was induced by contact heat, muscle pressure, bone pressure, rectal stimulations (mechanical, electrical and thermal) and cold pressor test (immersion of the hand into ice water). Sixteen genetic polymorphisms of four candidate genes were explored. Variability in morphine analgesia to contact heat stimulation was associated with COMT rs4680 (p = 0.04), and rectal thermal stimulation was associated with OPRM1 rs9479757 (p = 0.03). Moreover, in males, variability in morphine analgesia to rectal thermal stimulation was associated with OPRD1 polymorphisms: rs2234918 (p = 0.01) and rs533123 (p = 0.046). The study was explorative and hypothesis-generating due to the relatively small study size. However, results suggest that genetic variants in the COMT and OPRM1 irrespective of gender, and OPRD1 in males may contribute to the variability in morphine analgesia in experimental pain models.
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Affiliation(s)
- Lecia M Nielsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lona L Christrup
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Hiroe Sato
- Interstitial Lung Disease Unit, Royal Brompton Hospital & National Heart and Lung Institute, Imperial College London, London, UK
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Anne E Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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21
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Fischer IW, Gram M, Hansen TM, Brokjaer A, Graversen C, Malver LP, Mørch CD, Christrup LL, Drewes AM, Olesen AE. Cortical and spinal assessment - a comparative study using encephalography and the nociceptive withdrawal reflex. J Pharmacol Toxicol Methods 2017; 84:37-43. [DOI: 10.1016/j.vascn.2016.10.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 10/20/2016] [Accepted: 10/27/2016] [Indexed: 01/03/2023]
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22
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van Weerdenburg LJ, Brock C, Drewes AM, van Goor H, de Vries M, Wilder-Smith OH. Influence of exercise on visceral pain: an explorative study in healthy volunteers. J Pain Res 2017; 10:37-46. [PMID: 28096689 PMCID: PMC5207470 DOI: 10.2147/jpr.s121315] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Background and objectives Contradictory results have been found about the effect of different exercise modalities on pain. The aim of this study was to investigate the early effects of aerobic and isometric exercise on different types of experimental pain, including visceral pain, compared to an active control condition. Methods Fifteen healthy subjects (6 women, mean [standard deviation] age 25 [6.5] years) completed 3 interventions consisting of 20 minutes of aerobic cycling, 12 minutes of isometric knee extension and a deep breathing procedure as active control. At baseline and after each intervention, psychophysical tests were performed, including electrical stimulation of the esophagus, pressure pain thresholds and the cold pressor test as a measure for conditioned pain modulation. Participants completed the Medical Outcome Study Short-Form 36 and State-Trait Anxiety Inventory prior to the experiments. Data were analyzed using two-way repeated measures analysis of variance. Results No significant differences were found for the psychophysical tests after the interventions, compared to baseline pain tests and the control condition. Conclusion No hypoalgesic effect of aerobic and isometric exercise was found. The evidence for exercise-induced hypoalgesia appears to be not as consistent as initially thought, and caution is recommended when interpreting the effects of exercise on pain.
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Affiliation(s)
| | - Christina Brock
- Mech-Sense, Department of Gastroenterology, Aalborg University Hospital, Aalborg; Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology, Aalborg University Hospital, Aalborg
| | - Harry van Goor
- Department of Surgery, Radboud University Medical Centre, Nijmegen, the Netherlands
| | - Marjan de Vries
- Department of Surgery, Radboud University Medical Centre, Nijmegen, the Netherlands
| | - Oliver Hg Wilder-Smith
- Department of Anesthesiology, Pain and Palliative Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands
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23
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Nielsen LM, Sverrisdóttir E, Stage TB, Feddersen S, Brøsen K, Christrup LL, Drewes AM, Olesen AE. Lack of genetic association between OCT1, ABCB1, and UGT2B7 variants and morphine pharmacokinetics. Eur J Pharm Sci 2017; 99:337-342. [PMID: 28063968 DOI: 10.1016/j.ejps.2016.12.039] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 11/20/2016] [Accepted: 12/31/2016] [Indexed: 12/14/2022]
Abstract
AIM A high inter-individual variation in the pharmacokinetics and pharmacodynamics of morphine has been observed. Genetic polymorphisms in genes encoding the organic cation transporter isoform 1 (OCT1), the efflux transporter p-glycoprotein (ABCB1), and the UDP-glucuronosyltransferase-2B7 (UGT2B7) may influence morphine pharmacokinetics and thus, also pharmacodynamics. The aim of this study was to evaluate the association between OCT1, ABCB1, and UGT2B7 variants, and morphine pharmacokinetics and -dynamics in healthy volunteers. METHODS Pharmacokinetic and pharmacodynamic data were collected from a double-blinded, randomized, crossover trial in 37 healthy subjects. Pharmacokinetic data were analyzed in NONMEM®, and the time-concentration relationship of morphine, morphine-3-glucuronide, and morphine-6-glucuronide was parameterized as the transit compartment rate constant (ktr), clearance (CL), and volume of distribution (VD). The area under the plasma concentration-time curve (AUC0-150min) and the maximum plasma concentration (Cmax) were also calculated. Pharmacodynamic data were measured as pain tolerance thresholds to mechanical stimulation of the rectum and muscle, as well as tonic cold pain stimulation ("the cold pressor test" where hand was immersed in cold water). Six different single nucleotide polymorphisms in three different genes (OCT1 (n=22), ABCB1 (n=37), and UGT2B (n=22)) were examined. RESULTS Neither AUC0-150min, ktr, CL, nor VD were associated with genetic variants in OCT1, ABCB1, and UGT2B7 (all P>0.05). Similarly, the antinociceptive effects of morphine on rectal, muscle, and cold pressor tests were not associated with these genetic variants (all P>0.05). CONCLUSIONS In this experimental study in healthy volunteers, we found no association between different genotypes of OCT1, ABCB1, and UGT2B7, and morphine pharmacokinetics and pharmacodynamics. Nonetheless, due to methodological limitations we cannot exclude that associations exist.
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Affiliation(s)
- L M Nielsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - E Sverrisdóttir
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - T B Stage
- Clinical Pharmacology, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - S Feddersen
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
| | - K Brøsen
- Clinical Pharmacology, Department of Public Health, University of Southern Denmark, Odense, Denmark
| | - L L Christrup
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - A M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - A E Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
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24
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Hoff DAL, Brock C, Farmer AD, Dickman R, Ruffle JK, Shaker A, Drewes AM. Pharmacological and other treatment modalities for esophageal pain. Ann N Y Acad Sci 2016; 1380:58-66. [PMID: 27442914 DOI: 10.1111/nyas.13151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/23/2016] [Accepted: 05/25/2016] [Indexed: 12/11/2022]
Abstract
Treatment of esophageal pain remains a major challenge for the clinician. Although many patients have heartburn and may respond to proton pump inhibitors, there in an unmet need for other treatment modalities in patients where there are no obvious pathological findings. Although analgesics are the mainstay in esophageal pain treatment, many patients are nonresponders to these drugs. The current concise review focuses on other systems affecting pain processing, where better understanding may serve as a framework for therapy. These are the parasympathetic nervous system, exercise, and personality profiles. Finally, treatment with analgesics for functional chest pain remains a challenge, and an overview of treatment with antidepressive drugs is provided.
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Affiliation(s)
- Dag Arne Lihaug Hoff
- Clinic of Medicine HMR Hospital Trust, Department of Medicine, Division of Gastroenterology & Hepatology, Aalesund Hospital, Aalesund, Norway.
| | - Christina Brock
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute, Aalborg University, Aalborg, Denmark
| | - Adam D Farmer
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute, Aalborg University, Aalborg, Denmark.,Centre for Digestive Diseases, Blizard Institute, Wingate Institute of Neurogastroenterology, Barts and the London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom.,Department of Gastroenterology, University Hospitals of North Midlands, Stoke on Trent, United Kingdom
| | - Ram Dickman
- Division of Gastroenterology, Rabin Medical Center, Beilinson Campus, Petach Tikva & Sackler School of Medicine, University of Tel Aviv, Israel
| | - James K Ruffle
- Centre for Digestive Diseases, Blizard Institute, Wingate Institute of Neurogastroenterology, Barts and the London School of Medicine & Dentistry, Queen Mary University of London, London, United Kingdom
| | - Anisa Shaker
- Department of Medicine, Division of Gastrointestinal and Liver Diseases, University of Southern California, Keck School of Medicine, Los Angeles, California
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute, Aalborg University, Aalborg, Denmark
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25
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Brock C, Gregersen H, Gyawali CP, Lottrup C, Furnari M, Savarino E, Novais L, Frøkjaer JB, Bor S, Drewes AM. The sensory system of the esophagus--what do we know? Ann N Y Acad Sci 2016; 1380:91-103. [DOI: 10.1111/nyas.13205] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 07/19/2016] [Accepted: 07/19/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Christina Brock
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
| | - Hans Gregersen
- GIOME and the Key Laboratory for Biorheological Science and Technology of Ministry of Education, College of Bioengineering; Chongqing University; Chongqing China
| | - C. Prakash Gyawali
- Division of Gastroenterology; Washington University School of Medicine; St. Louis Missouri
| | - Christian Lottrup
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
- Department of Medicine; North Jutland Regional Hospital; Hjørring Denmark
| | - Manuele Furnari
- Division of Gastroenterology, Department of Internal Medicine; University of Genoa; Genoa Italy
| | - Edoardo Savarino
- Division of Gastroenterology, Department of Surgery, Oncology and Gastroenterology; University of Padua; Padua Italy
| | - Luis Novais
- Neurogastroenterology and Gastrointestinal Motility Laboratory, Nova Medical School; Universidade Nova de Lisboa; Lisbon Portugal
| | - Jens Brøndum Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
| | - Serhat Bor
- Department of Gastroenterology; Ege University School of Medicine; Bornova Izmir Turkey
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital and Clinical Institute; Aalborg University; Aalborg Denmark
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26
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Farmer AD, Brock C, Frøkjaer JB, Gregersen H, Khan S, Lelic D, Lottrup C, Drewes AM. Understanding the sensory irregularities of esophageal disease. Expert Rev Gastroenterol Hepatol 2016; 10:907-14. [PMID: 26890720 DOI: 10.1586/17474124.2016.1155984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Symptoms relating to esophageal sensory abnormalities can be encountered in the clinical environment. Such sensory abnormalities may be present in demonstrable disease, such as erosive esophagitis, and in the ostensibly normal esophagus, such as non-erosive reflux disease or functional chest pain. In this review, the authors discuss esophageal sensation and the esophageal pain system. In addition, the authors provide a primer concerning the techniques that are available for investigating the autonomic nervous system, neuroimaging and neurophysiology of esophageal sensory function. Such technological advances, whilst not readily available in the clinic may facilitate the stratification and individualization of therapy in disorders of esophageal sensation in the future.
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Affiliation(s)
- Adam D Farmer
- a Mech-Sense , University Hospital Aalborg , Aalborg , Denmark.,b Centre for Digestive Diseases, Wingate Institute of Neurogastroenterology, Blizard Institute, Barts and the London School of Medicine & Dentistry, Queen Mary University of London , London , UK.,c Department of Gastroenterology , University Hospitals of North Midlands , Stoke on Trent , UK
| | - Christina Brock
- a Mech-Sense , University Hospital Aalborg , Aalborg , Denmark
| | - Jens Brøndum Frøkjaer
- a Mech-Sense , University Hospital Aalborg , Aalborg , Denmark.,d Department of Radiology , Aalborg University Hospital , Aalborg , Denmark
| | - Hans Gregersen
- e GIOME, Key Laboratory for Biorheological Science and Technology , College of Bioengineering, Chongqing University , Chongqing , China
| | - Sheeba Khan
- c Department of Gastroenterology , University Hospitals of North Midlands , Stoke on Trent , UK
| | - Dina Lelic
- a Mech-Sense , University Hospital Aalborg , Aalborg , Denmark
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27
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Farmer AD, Franchina M, Gregersen H, Penagini R, Shaker A, Soffer E. Provocative testing of the esophagus and its future. Ann N Y Acad Sci 2016; 1380:33-47. [DOI: 10.1111/nyas.13109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 04/21/2016] [Accepted: 04/25/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Adam D. Farmer
- Centre for Digestive Diseases, Wingate Institute of Neurogastroenterology, Blizard Institute, Barts and the London School of Medicine & Dentistry; Queen Mary University of London; London United Kingdom
- Department of Gastroenterology; University Hospitals of North Midlands; Stoke on Trent Staffordshire United Kingdom
| | - Marianna Franchina
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi of Milan and Gastroenterology and Endoscopy Unit; Fondazione IRCCS Cà Granda - Ospedale Maggiore Policlinico; Milan Italy
| | - Hans Gregersen
- GIOME, College of Bioengineering; Chongqing University; Chongqing China
- Department of Surgery; Prince of Wales Hospital; Shatin Hong Kong SAR
| | - Roberto Penagini
- Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi of Milan and Gastroenterology and Endoscopy Unit; Fondazione IRCCS Cà Granda - Ospedale Maggiore Policlinico; Milan Italy
| | - Anisa Shaker
- Department of Medicine; University of Southern California; Los Angeles California
| | - Edy Soffer
- Department of Medicine; University of Southern California; Los Angeles California
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28
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Nielsen LM, Olesen AE, Sato H, Christrup LL, Drewes AM. Association between Gene Polymorphisms and Pain Sensitivity Assessed in a Multi-Modal Multi-Tissue Human Experimental Model - An Explorative Study. Basic Clin Pharmacol Toxicol 2016; 119:360-6. [PMID: 27061127 DOI: 10.1111/bcpt.12601] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 04/04/2016] [Indexed: 12/27/2022]
Abstract
The genetic influence on sensitivity to noxious stimuli (pain sensitivity) remains controversial and needs further investigation. In the present study, the possible influence of polymorphisms in three opioid receptor (OPRM, OPRD and OPRK) genes and the catechol-O-methyltransferase (COMT) gene on pain sensitivity in healthy participants was investigated. Catechol-O-methyltransferase has an indirect effect on the mu opioid receptor by changing its activity through an altered endogenous ligand effect. Blood samples for genetic analysis were withdrawn in a multi-modal and multi-tissue experimental pain model in 40 healthy participants aged 20-65. Seventeen different single nucleotide polymorphisms in different genes (OPRM, OPRK, OPRD and COMT) were included in the analysis. Experimental pain tests included thermal skin stimulation, mechanical muscle and bone stimulation and mechanical, electrical and thermal visceral stimulations. A cold pressor test was also conducted. DNA was available from 38 of 40 participants. Compared to non-carriers of the COMT rs4680A allele, carriers reported higher bone pressure pain tolerance threshold (i.e. less pain) by up to 23.8% (p < 0.015). Additionally, carriers of the C allele (CC/CT) of OPRK rs6473799 reported a 30.4% higher mechanical visceral pain tolerance threshold than non-carriers (TT; p < 0.019). For the other polymorphisms and stimulations, no associations were found (all p > 0.05). In conclusion, COMT rs4680 and OPRK rs6473799 polymorphisms seem to be associated with pain sensitivity. Thus, the findings support a possible genetic influence on pain sensitivity.
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Affiliation(s)
- Lecia Møller Nielsen
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Faculty of Health and Medical Sciences, Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Anne Estrup Olesen
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark. .,Faculty of Health and Medical Sciences, Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark. .,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
| | - Hiroe Sato
- Interstitial Lung Disease Unit, National Heart and Lung Institute, Imperial College London, Royal Brompton Hospital, London, UK
| | - Lona Louring Christrup
- Faculty of Health and Medical Sciences, Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Asbjørn Mohr Drewes
- Department of Gastroenterology and Hepatology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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29
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Opioid-induced bowel dysfunction in healthy volunteers assessed with questionnaires and MRI. Eur J Gastroenterol Hepatol 2016; 28:514-24. [PMID: 26795566 DOI: 10.1097/meg.0000000000000574] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Opioid treatment is associated with numerous gastrointestinal adverse effects collectively known as opioid-induced bowel dysfunction (OIBD). Most current knowledge of the pathophysiology derives from animal studies limited by species differences and clinical studies, which have substantial confounders that make evaluation difficult. An experimental model of OIBD in healthy volunteers in a controlled setting is therefore highly warranted. The aim of this study was to assess bowel function in healthy volunteers during opioid treatment using subjective and objective methods. METHODS Twenty-five healthy men were assigned randomly to oxycodone or placebo for 5 days in a cross-over design. The analgesic effect was assessed with muscle pressure algometry and adverse effects were measured using questionnaires including the bowel function index, gastrointestinal symptom rating scale, patient assessment of constipation symptoms and the Bristol stool form scale. Colorectal volumes were determined using a newly developed MRI method. RESULTS Compared with baseline, oxycodone increased pain detection thresholds by 8% (P=0.02). Subjective OIBD was observed as increased bowel function index (464% increase; P<0.001), gastrointestinal symptom rating scale (37% increase; P<0.001) and patient assessment of constipation symptoms (198% increase; P<0.001). Objectively, stools were harder and drier during oxycodone treatment (P<0.001) and segmental colorectal volumes increased in the caecum/ascending colon by 41% (P=0.005) and in the transverse colon by 20% (P=0.005). No associations were detected between questionnaire scores and colorectal volumes. CONCLUSION Experimental OIBD in healthy volunteers was induced during oxycodone treatment. This model has potential for future interventional studies to discriminate the efficacies of different laxatives, peripheral morphine antagonists and opioid treatments.
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30
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Poulsen JL, Nilsson M, Brock C, Sandberg TH, Krogh K, Drewes AM. The Impact of Opioid Treatment on Regional Gastrointestinal Transit. J Neurogastroenterol Motil 2016; 22:282-91. [PMID: 26811503 PMCID: PMC4819867 DOI: 10.5056/jnm15175] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 12/22/2015] [Accepted: 12/31/2015] [Indexed: 12/28/2022] Open
Abstract
Background/Aims To employ an experimental model of opioid-induced bowel dysfunction in healthy human volunteers, and evaluate the impact of opioid treatment compared to placebo on gastrointestinal (GI) symptoms and motility assessed by questionnaires and regional GI transit times using the 3-dimensional (3D)-Transit system. Methods Twenty-five healthy males were randomly assigned to oxycodone or placebo for 5 days in a double blind, crossover design. Adverse GI effects were measured with the bowel function index, gastrointestinal symptom rating scale, patient assessment of constipation symptom questionnaire, and Bristol stool form scale. Regional GI transit times were determined using the 3D-Transit system, and segmental transit times in the colon were determined using a custom Matlab® graphical user interface. Results GI symptom scores increased significantly across all applied GI questionnaires during opioid treatment. Oxycodone increased median total GI transit time from 22.2 to 43.9 hours (P < 0.001), segmental transit times in the cecum and ascending colon from 5.7 to 9.9 hours (P = 0.012), rectosigmoid colon transit from 2.7 to 9.0 hours (P = 0.044), and colorectal transit time from 18.6 to 38.6 hours (P = 0.001). No associations between questionnaire scores and segmental transit times were detected. Conclusions Self-assessed GI adverse effects and increased GI transit times in different segments were induced during oxycodone treatment. This detailed information about segmental changes in motility has great potential for future interventional head-to-head trials of different laxative regimes for prevention and treatment of constipation.
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Affiliation(s)
- Jakob L Poulsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Matias Nilsson
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Christina Brock
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Thomas H Sandberg
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Klaus Krogh
- Neurogastroenterology Unit, Department of Hepatology and Gastroenterology, Aarhus University Hospital, Aarhus, Denmark
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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31
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Hansen TM, Graversen C, Frøkjaer JB, Olesen AE, Valeriani M, Drewes AM. Single-sweep spectral analysis of contact heat evoked potentials: a novel approach to identify altered cortical processing after morphine treatment. Br J Clin Pharmacol 2016; 79:926-36. [PMID: 25556985 DOI: 10.1111/bcp.12579] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 12/15/2014] [Accepted: 12/16/2014] [Indexed: 12/13/2022] Open
Abstract
AIMS The cortical response to nociceptive thermal stimuli recorded as contact heat evoked potentials (CHEPs) may be altered by morphine. However, previous studies have averaged CHEPs over multiple stimuli, which are confounded by jitter between sweeps. Thus, the aim was to assess single-sweep characteristics to identify alterations induced by morphine. METHODS In a crossover study 15 single-sweep CHEPs were analyzed from 62 electroencephalography electrodes in 26 healthy volunteers before and after administration of morphine or placebo. Each sweep was decomposed by a continuous wavelet transform to obtain normalized spectral indices in the delta (0.5-4 Hz), theta (4-8 Hz), alpha (8-12 Hz), beta (12-32 Hz) and gamma (32-80 Hz) bands. The average distribution over all sweeps and channels was calculated for the four recordings for each volunteer, and the two recordings before treatments were assessed for reproducibility. Baseline corrected spectral indices after morphine and placebo treatments were compared to identify alterations induced by morphine. RESULTS Reproducibility between baseline CHEPs was demonstrated. As compared with placebo, morphine decreased the spectral indices in the delta and theta bands by 13% (P = 0.04) and 9% (P = 0.007), while the beta and gamma bands were increased by 10% (P = 0.006) and 24% (P = 0.04). CONCLUSION The decreases in the delta and theta band are suggested to represent a decrease in the pain specific morphology of the CHEPs, which indicates a diminished pain response after morphine administration. Hence, assessment of spectral indices in single-sweep CHEPs can be used to study cortical mechanisms induced by morphine treatment.
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Affiliation(s)
- Tine M Hansen
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Carina Graversen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Jens B Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - Anne E Olesen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Massimiliano Valeriani
- Division of Neurology, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome, Italy.,Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Asbjørn M Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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32
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A review of morphine and morphine-6-glucuronide’s pharmacokinetic–pharmacodynamic relationships in experimental and clinical pain. Eur J Pharm Sci 2015; 74:45-62. [DOI: 10.1016/j.ejps.2015.03.020] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 01/31/2015] [Accepted: 03/23/2015] [Indexed: 01/10/2023]
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33
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Haas S, Brock C, Krogh K, Gram M, Lundby L, Drewes AM, Laurberg S. Abnormal neuronal response to rectal and anal stimuli in patients with idiopathic fecal incontinence. Neurogastroenterol Motil 2015; 27:954-62. [PMID: 25903483 DOI: 10.1111/nmo.12567] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 03/16/2015] [Indexed: 12/14/2022]
Abstract
BACKGROUND The pathophysiology behind idiopathic fecal incontinence (IFI) is poorly understood. We hypothesized abnormal sensory pathways along the brain-gut axis as a key player in this disease, reflected in cortical evoked potentials (CEP) from mechanical stimuli of the rectum and the anal canal. METHODS CEPs were recorded during repeated rapid balloon distensions of the rectum and anal canal in 19 women with IFI (mean age: 60 ± 14, mean Wexner score: 14.7 ± 2.9) and in 19 healthy women (mean age: 56 ± 11, mean Wexner score: 1.1 ± 1.3). Latencies, amplitudes and topography of CEPs elicited by rectal distension were compared between the groups. CEPs from both rectal and anal distensions were examined using spectral band analysis of single sweeps determining the relative amplitude of five spectral bands as a proxy of neuronal processing. KEY RESULTS Compared to controls IFI patients had prolonged latency of CEPs from rectal distension by up to 27% (p < 0.001) while amplitudes and topography were similar (all p > 0.7 and all p > 0.23). Spectral analysis of CEPs from rectal distensions showed no difference (all p > 0.1) between groups. However, analysis of CEPs following distension of the anal canal resulted in abnormally low activity in beta (8-12 Hz; p < 0.001) band and high activity in the gamma (32-70 Hz; p = 0.04) band in patients. CONCLUSIONS & INFERENCES IFI seems to be associated with impaired ano-rectal sensory functions in both the afferent fibers to the brain and the cortical processing of anal sensory pathways. This may play a central role for the pathogenesis of IFI.
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Affiliation(s)
- S Haas
- Department of Surgery P, Aarhus University Hospital, Aarhus, Denmark
| | - C Brock
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - K Krogh
- Neurogastroenterology Unit, Department of Hepatology and Gastroenterology, Aarhus University Hospital, Aarhus, Denmark
| | - M Gram
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - L Lundby
- Department of Surgery P, Aarhus University Hospital, Aarhus, Denmark
| | - A M Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - S Laurberg
- Department of Surgery P, Aarhus University Hospital, Aarhus, Denmark
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Lelic D, Nissen TD, Brock C, Aziz Q, Drewes AM. Rapid balloon distension as a tool to study cortical processing of visceral sensations and pain. Neurogastroenterol Motil 2015; 27:832-40. [PMID: 26011783 DOI: 10.1111/nmo.12557] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 02/27/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND The processing of discomfort and pain in the central nervous system is normally studied with experimental methods, but it is mandatory that they are reliable over time to ensure that any interventions will result in valid results. We investigated reliability of rapid balloon distension in the rectum to elicit cortical evoked potentials (CEPs) to study the reliability of central processing of visceral sensation and discomfort/pain. METHODS Eighteen healthy volunteers had two series of rectal balloon distensions performed on two separate days. Individualized balloon pressure, corresponding to pain detection threshold or to the maximum possible distension (30 psi), was used. Within- and between days reliability was measured in terms of amplitudes and latencies of the CEP global field power, topography and underlying brain networks. KEY RESULTS There were two prominent peaks in the CEP recordings at mean latencies of 157 and 322 ms. There were no differences in latencies or amplitudes (p = 0.3) and they passed the Bland-Altman test for reproducibility. There were no differences in topographies (p > 0.7). Brain source connectivity revealed the cingulate-operculum network as the most consistent network within and between subjects. There were no differences in the location of brain sources in this network (p = 0.9) and the source coordinates were reproducible. Finally, the cingulate source generally had higher strength than operculum source (p < 0.001). CONCLUSIONS & INFERENCES A reliable method to study central mechanisms underlying visceral sensation and pain was established. The method may improve our understanding of visceral pain and could be an objective method for studying efficacy of analgesics on visceral pain.
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Affiliation(s)
- D Lelic
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - T D Nissen
- Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
| | - C Brock
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Q Aziz
- Centre for Digestive Diseases, Blizard Institute, The Wingate Institute of Neurogastroenterology, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - A M Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
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Hansen TM, Olesen AE, Graversen C, Drewes AM, Frøkjaer JB. The Effect of Oral Morphine on Pain-Related Brain Activation - An Experimental Functional Magnetic Resonance Imaging Study. Basic Clin Pharmacol Toxicol 2015; 117:316-22. [PMID: 25924691 DOI: 10.1111/bcpt.12415] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 04/23/2015] [Indexed: 01/04/2023]
Abstract
Knowledge about cerebral mechanisms underlying pain perception and effect of analgesic drugs is important for developing methods for diagnosis and treatment of pain. The aim was to explore altered brain activation before and after morphine treatment using functional magnetic resonance imaging recorded during experimental painful heat stimulation. Functional magnetic resonance imaging data were recorded and analysed in 20 healthy volunteers (13 men and 7 women, 24.9 ± 2.6 years) in a randomized, double-blind, placebo-controlled, cross-over study. Painful stimulations were applied to the right forearm using a contact heat evoked potential stimulator (CHEPS) before and after treatment with 30 mg oral morphine and placebo. CHEPS stimulations before treatment induced activation in the anterior cingulate cortex, secondary somatosensory cortex/insula, thalamus and cerebellum (n = 16, p < 0.05). In response to morphine treatment, the spatial extent of these pain-specific areas decreased (n = 20). Reduced pain-induced activation was seen in the right insula, anterior cingulate cortex and inferior parietal cortex after morphine treatment compared to before treatment (n = 16, p < 0.05), and sensory ratings of pain perception were significantly reduced after morphine treatment (p = 0.02). No effect on pain-induced brain activation was seen after placebo treatment compared to before treatment (n = 12, p > 0.05). In conclusion, heat stimulation activated areas in the 'pain matrix' and a clinically relevant dose of orally administered morphine revealed significant changes in brain areas where opioidergic pathways are predominant. The method may be useful to investigate the mechanisms of analgesics.
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Affiliation(s)
- Tine Maria Hansen
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Anne Estrup Olesen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Carina Graversen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.,Department of Health Science and Technology, Center for Sensory-Motor Interaction (SMI), Aalborg University, Aalborg, Denmark
| | - Jens Brøndum Frøkjaer
- Mech-Sense, Department of Radiology, Aalborg University Hospital, Aalborg, Denmark.,Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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Juel J, Liguori S, Liguori A, Valeriani M, Graversen C, Olesen SS, Drewes AM. A New Method for Sham-Controlled Acupuncture in Experimental Visceral Pain - a Randomized, Single-Blinded Study. Pain Pract 2015; 16:669-79. [DOI: 10.1111/papr.12309] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Accepted: 03/02/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Jacob Juel
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg University Hospital; Aalborg Denmark
| | | | - Aldo Liguori
- Istituto Paracelso; Rome Italy
- Department of Anatomic, Histologic; Forensic Medicine and Locomotor System Sciences; Faculty of Pharmacy and Medicine; Sapienza University; Rome Italy
| | - Massimiliano Valeriani
- Department of Neurology; Paediatric Hospital Bambino Gesù; Rome Italy
- Center for Sensory-Motor Interaction; Department of Health Science and Technology; Faculty of Medicine; Aalborg University; Aalborg Denmark
| | - Carina Graversen
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg University Hospital; Aalborg Denmark
| | - Søren S. Olesen
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg University Hospital; Aalborg Denmark
| | - Asbjørn M. Drewes
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg University Hospital; Aalborg Denmark
- Center for Sensory-Motor Interaction; Department of Health Science and Technology; Faculty of Medicine; Aalborg University; Aalborg Denmark
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Brock C, Brokjaer A, Drewes AM, Farmer AD, Frøkjaer JB, Gregersen H, Lottrup C. Neurophysiology of the esophagus. Ann N Y Acad Sci 2015; 1325:57-68. [PMID: 25266015 DOI: 10.1111/nyas.12515] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The following, from the 12th OESO World Conference: Cancers of the Esophagus, includes commentaries on the methods and characteristics of esophageal afferents in humans; the pitfalls in characterization of mechanosensitive afferents; the sensitization of esophageal afferents in human studies; the brain source modeling in the understanding of the esophagus-brain axis; the use of evoked brain potentials in the esophagus; and measuring descending inhibition in animal and human studies.
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Affiliation(s)
- Christina Brock
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
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Malver LP, Brokjaer A, Staahl C, Graversen C, Andresen T, Drewes AM. Electroencephalography and analgesics. Br J Clin Pharmacol 2015; 77:72-95. [PMID: 23593934 DOI: 10.1111/bcp.12137] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 03/05/2013] [Indexed: 11/29/2022] Open
Abstract
To assess centrally mediated analgesic mechanisms in clinical trials with pain patients, objective standardized methods such as electroencephalography (EEG) has many advantages. The aim of this review is to provide the reader with an overview of present findings in analgesics assessed with spontaneous EEG and evoked brain potentials (EPs) in humans. Furthermore, EEG methodologies will be discussed with respect to translation from animals to humans and future perspectives in predicting analgesic efficacy. We searched PubMed with MeSH terms 'analgesics', 'electroencephalography' and 'evoked potentials' for relevant articles. Combined with a search in their reference lists 15 articles on spontaneous EEG and 55 papers on EPs were identified. Overall, opioids produced increased activity in the delta band in the spontaneous EEG, but increases in higher frequency bands were also seen. The EP amplitudes decreased in the majority of studies. Anticonvulsants used as analgesics showed inconsistent results. The N-methyl-D-aspartate receptor antagonist ketamine showed an increase in the theta band in spontaneous EEG and decreases in EP amplitudes. Tricyclic antidepressants increased the activity in the delta, theta and beta bands in the spontaneous EEG while EPs were inconsistently affected. Weak analgesics were mainly investigated with EPs and a decrease in amplitudes was generally observed. This review reveals that both spontaneous EEG and EPs are widely used as biomarkers for analgesic drug effects. Methodological differences are common and a more uniform approach will further enhance the value of such biomarkers for drug development and prediction of treatment response in individual patients.
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Affiliation(s)
- Lasse Paludan Malver
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark
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Olesen AE, Nielsen LM, Larsen IM, Drewes AM. Randomized clinical trial: efficacy and safety of PPC-5650 on experimental esophageal pain and hyperalgesia in healthy volunteers. Scand J Gastroenterol 2015; 50:138-44. [PMID: 25483563 DOI: 10.3109/00365521.2014.966319] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE Gastroesophageal reflux disease (GERD) is a common condition associated with symptoms as heart burn, regurgitation, chest pain, and gastrointestinal discomfort. PPC-5650 is a new pharmacological agent that can modulate acid-sensing ion channel activity, potentially leading to reduction in the pain signal. In healthy volunteers the esophagus was sensitized with acid to mimic GERD with the aims: 1) to assess the efficacy of a single bolus of PPC-5650 locally applied to the esophagus using multimodal pain stimulations, and 2) to assess the safety profile of PPC-5650. MATERIALS AND METHODS The study was a randomized, double-blinded, placebo-controlled, crossover trial in healthy males. Esophageal electrical, thermal, mechanical, and chemical stimulations were performed, pain perception was rated, and referred pain areas were drawn. Sensitization was induced by intraluminal esophageal acid perfusions. Adverse events were registered. RESULTS Twenty-five healthy males completed the study (mean age 23.4 ± 2.0 years). About 90 min after drug administration, PPC-5650 increased the volume tolerated at moderate pain during mechanical stimulation compared to placebo (difference 13.5, 95% CI: 0.58-26.47, p = 0.04), but there was no effects on thermal-, electrical-, and chemical-induced pain (all p > 0.05). PPC-5650 did not affect referred pain areas to any stimulation (all p > 0.05). Ten participants reported adverse events during the placebo treatment period, and nine participants reported adverse events during the PPC-5650 treatment period (p = 0.8). CONCLUSION Sensitization to mechanical stimulation of the esophagus was reduced by PPC-5650 compared to placebo. The overall safety and tolerability of PPC-5650 was acceptable. Thus, PPC-5650 may play a role in the future treatment of patients with GERD.
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Affiliation(s)
- Anne Estrup Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital , Aalborg , Denmark
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Nilsson M, Lassen D, Andresen T, Nielsen AK, Arendt-Nielsen L, Drewes AM. Intradermal glutamate and capsaicin injections: intra- and interindividual variability of provoked hyperalgesia and allodynia. Clin Exp Pharmacol Physiol 2015; 41:423-9. [PMID: 24684312 DOI: 10.1111/1440-1681.12229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 03/20/2014] [Accepted: 03/22/2014] [Indexed: 11/30/2022]
Abstract
Intradermal injections of glutamate and capsaicin are attractive to use in human experimental pain models because hyperalgesia and allodynia mimic isolated aspects of clinical pain disorders. The aim of the present study was to investigate the reproducibility of these models. Twenty healthy male volunteers (mean age 24 years; range 18-38 years) received intradermal injections of glutamate and capsaicin in the volar forearm. Magnitudes of secondary pinprick hyperalgesia and brush-evoked allodynia were investigated using von Frey filaments (gauges 10, 15, 60 and 100 g) and brush strokes. Areas of secondary hyperalgesia and allodynia were quantified immediately after injection and after 15, 30 and 60 min. Two identical experiments separated by at least 7 days were performed. Reproducibility across and within volunteers (inter- and intra-individual variation, respectively) was assessed using intraclass correlation coefficient (ICC) and coefficient of variation (CV). Secondary pinprick hyperalgesia was observed as a marked increase in the visual analogue scale (VAS) response to von Frey gauges 60 and 100 g (P < 0.001) after glutamate injection. For capsaicin, secondary pinprick hyperalgesia was detected with all von Frey gauges (P < 0.001). Glutamate evoked reproducible VAS response to all von Frey gauges (ICC > 0.60) and brush strokes (ICC > 0.83). Capsaicin injection was reproducible for secondary hyperalgesia (ICC > 0.70) and allodynia (ICC > 0.71). Intra-individual variability was generally lower for the VAS response to von Frey and brush compared with areas of secondary hyperalgesia and allodynia. In conclusion, glutamate and capsaicin yield reproducible hyperalgesic and allodynic responses, and the present model is well suited for basic research, as well as for assessing the modulation of central phenomena.
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Affiliation(s)
- Matias Nilsson
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg University, Aalborg, Denmark
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Olesen AE, Brock C, Sverrisdóttir E, Larsen IM, Drewes AM. Sensitivity of quantitative sensory models to morphine analgesia in humans. J Pain Res 2014; 7:717-26. [PMID: 25525384 PMCID: PMC4266386 DOI: 10.2147/jpr.s73044] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Introduction Opioid analgesia can be explored with quantitative sensory testing, but most investigations have used models of phasic pain, and such brief stimuli may be limited in the ability to faithfully simulate natural and clinical painful experiences. Therefore, identification of appropriate experimental pain models is critical for our understanding of opioid effects with the potential to improve treatment. Objectives The aim was to explore and compare various pain models to morphine analgesia in healthy volunteers. Methods The study was a double-blind, randomized, two-way crossover study. Thirty-nine healthy participants were included and received morphine 30 mg (2 mg/mL) as oral solution or placebo. To cover both tonic and phasic stimulations, a comprehensive multi-modal, multi-tissue pain-testing program was performed. Results Tonic experimental pain models were sensitive to morphine analgesia compared to placebo: muscle pressure (F=4.87, P=0.03), bone pressure (F=3.98, P=0.05), rectal pressure (F=4.25, P=0.04), and the cold pressor test (F=25.3, P<0.001). Compared to placebo, morphine increased tolerance to muscle stimulation by 14.07%; bone stimulation by 9.72%; rectal mechanical stimulation by 20.40%, and reduced pain reported during the cold pressor test by 9.14%. In contrast, the more phasic experimental pain models were not sensitive to morphine analgesia: skin heat, rectal electrical stimulation, or rectal heat stimulation (all P>0.05). Conclusion Pain models with deep tonic stimulation including C fiber activation and and/or endogenous pain modulation were more sensitive to morphine analgesia. To avoid false negative results in future studies, we recommend inclusion of reproducible tonic pain models in deep tissues, mimicking clinical pain to a higher degree.
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Affiliation(s)
- Anne Estrup Olesen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark ; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Christina Brock
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark ; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Eva Sverrisdóttir
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Isabelle Myriam Larsen
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology and Hepatology, Aalborg University Hospital, Aalborg, Denmark ; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark
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Andresen T, Nilsson M, Nielsen AK, Lassen D, Arendt-Nielsen L, Drewes AM. Intradermal Injection with Nerve Growth Factor: A Reproducible Model to Induce Experimental Allodynia and Hyperalgesia. Pain Pract 2014; 16:12-23. [PMID: 25470218 DOI: 10.1111/papr.12267] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 10/10/2014] [Indexed: 01/17/2023]
Abstract
BACKGROUND Nerve growth factor (NGF) plays a pivotal role in survival, growth, and differentiation of the nervous system. Increased levels of NGF have been reported in human pain disorders. Experimental injection of NGF in humans is known to evoke long-lasting mechanical sensitization and subsequent allodynia and hyperalgesia. METHODS Reproducibility of intradermal injection of NGF was investigated. Twenty healthy male volunteers were included (mean age 24 years, range 19 to 31). The experiment consisted of 3 identical treatment periods with period 1 stimulating the right arm, period 2 the left arm, and period 3 stimulating the right arm again (period one and three were separated by at least 21 days). Pain intensity was assessed in response to several phasic stimuli in 3 adjacent sites of the volar forearm: pressure; pinprick; brush; and heat before and after NGF injection. Additionally, areas of allodynia and secondary hyperalgesia were assessed. Rekindling with pressure was performed 1 hour and 24 hours after injection. Reproducibility was assessed with intraclass correlation coefficient (ICC 3,1). RESULTS ICC values > 0.6 for all phasic stimuli and for the area of hyperalgesia. After NGF injection, pressure pain (P < 0.001) and heat pain (P < 0.01) sensitivity increased significantly. After rekindling, the area of hyperalgesia (von Frey 26 g) was significantly increased (P = 0.03) and sensitivity to pinprick was increased (P < 0.02). CONCLUSION Intradermal NGF injection is capable of inducing reproducible allodynia and hyperalgesia, and the model is recommended for future experimental and pharmacological pain studies.
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Affiliation(s)
- Trine Andresen
- Department of Gastroenterology & Hepatology, Center of Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Matias Nilsson
- Department of Gastroenterology & Hepatology, Center of Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Anders Klitgaard Nielsen
- Department of Gastroenterology & Hepatology, Center of Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Dorte Lassen
- Department of Gastroenterology & Hepatology, Center of Mech-Sense, Aalborg University Hospital, Aalborg, Denmark
| | - Lars Arendt-Nielsen
- Department of Health Science and Technology, Center for Sensory-Motor Interactions (SMI), Aalborg University, Aalborg, Denmark
| | - Asbjørn Mohr Drewes
- Department of Gastroenterology & Hepatology, Center of Mech-Sense, Aalborg University Hospital, Aalborg, Denmark.,Department of Health Science and Technology, Center for Sensory-Motor Interactions (SMI), Aalborg University, Aalborg, Denmark
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Sverrisdóttir E, Foster DJR, Upton RN, Olesen AE, Lund TM, Gabel-Jensen C, Drewes AM, Christrup LL, Kreilgaard M. Modelling concentration-analgesia relationships for morphine to evaluate experimental pain models. Eur J Pharm Sci 2014; 66:50-8. [PMID: 25315409 DOI: 10.1016/j.ejps.2014.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 08/29/2014] [Accepted: 10/02/2014] [Indexed: 02/07/2023]
Abstract
The aim of this study was to develop population pharmacokinetic-pharmacodynamic models for morphine in experimental pain induced by skin heat and muscle pressure, and to evaluate the experimental pain models with regard to assessment of morphine pharmacodynamics. In a randomised, double-blind, placebo-controlled, crossover study, 39 healthy volunteers received an oral dose of 30mg morphine hydrochloride or placebo. Non-linear mixed effects modelling was used to describe the plasma concentrations of morphine and metabolites, and the analgesic effect of morphine on experimental pain in skin and muscle. Baseline pain metrics varied between individuals and occasions, and were described with interindividual and interoccasion variability. Placebo-response did not change with time. For both pain metrics, morphine effect was proportional to baseline pain and was described with a linear model with interindividual variability on drug effect slope and linked to an effect compartment for muscle pressure. The models indicate that a steady-state morphine concentration of 21ng/ml causes 33% and 0.84% increases in stimulus intensity from baseline for muscle pressure and skin heat, respectively. The population pharmacokinetic-pharmacodynamic models developed in this study indicate that mechanical stimulation of muscle is a more clinically relevant pain stimulus for the assessment of morphine pharmacodynamics than thermal stimulation of skin.
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Affiliation(s)
- Eva Sverrisdóttir
- Department of Drug Design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - David John Richard Foster
- Australian Centre for Pharmacometrics, School of Pharmaceutical and Medical Sciences, City East Campus, North Terrace, University of South Australia, Adelaide, SA 5000, Australia
| | - Richard Neil Upton
- Australian Centre for Pharmacometrics, School of Pharmaceutical and Medical Sciences, City East Campus, North Terrace, University of South Australia, Adelaide, SA 5000, Australia
| | - Anne Estrup Olesen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Mølleparkvej 4, DK-9000 Aalborg, Denmark
| | - Trine Meldgaard Lund
- Department of Drug Design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Charlotte Gabel-Jensen
- Department of Pharmacy, Faculty of Health Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Mølleparkvej 4, DK-9000 Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Sdr. Skovvej 11, DK-9000 Aalborg, Denmark
| | - Lona Louring Christrup
- Department of Drug Design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Mads Kreilgaard
- Department of Drug Design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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Nielsen LM, Olesen AE, Andresen T, Simrén M, Törnblom H, Drewes AM. Efficacy and safety of PPC-5650 on experimental rectal pain in patients with irritable bowel syndrome. Basic Clin Pharmacol Toxicol 2014; 116:140-5. [PMID: 25052366 DOI: 10.1111/bcpt.12294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 06/30/2014] [Indexed: 12/14/2022]
Abstract
PPC-5650 is a new pharmacological agent that can modulate acid-sensing ion channel activity, leading to a reduction in the pain signal under up-regulated conditions. The non-clinical programme for PPC-5650 supported a role for this novel agent in the treatment of pain in patients with irritable bowel syndrome (IBS). In patients with IBS, the aims of the study were: (1) to assess the efficacy of a single bolus of PPC-5650 locally applied in the rectum using multi-modal stimulations of the recto sigmoid and (2) to assess the safety profile of PPC-5650. The study was a randomized, double-blind, placebo-controlled, cross-over trial in patients with IBS, excluding females of child-bearing potential. The study consisted of a training visit, study visit 1 and 2 and a follow-up visit. Rectosigmoid electrical, thermal and mechanical stimulations were performed, pain perception was rated on a pain intensity scale and referred pain areas were assessed. All adverse events were registered. Twenty-five patients with IBS were enrolled and completed the study (9 women and 16 men; mean age 50.4 ± 12.7 years). No effects of the study drug were found on any of the rectal stimulations or for referred pain areas (all p > 0.05). No significant or clinically relevant treatment-related differences were seen for the laboratory safety variables or any other reported adverse event. In conclusion, in patients with IBS on rectal sensitivity to multi-modal stimulations, PPC-5650 did not produce efficacy relative to placebo. The overall safety and tolerability of PPC-5650 was acceptable.
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Affiliation(s)
- Lecia Møller Nielsen
- Mech-Sense, Department of Gastroenterology & Hepatology, Aalborg University Hospital, Aalborg, Denmark; Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Haas S, Brock C, Krogh K, Gram M, Nissen TD, Lundby L, Laurberg S, Drewes AM. Cortical evoked potentials in response to rapid balloon distension of the rectum and anal canal. Neurogastroenterol Motil 2014; 26:862-73. [PMID: 24750321 DOI: 10.1111/nmo.12341] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Accepted: 03/11/2014] [Indexed: 02/08/2023]
Abstract
BACKGROUND Neurophysiological evaluation of anorectal sensory function is hampered by a paucity of methods. Rapid balloon distension (RBD) has been introduced to describe the cerebral response to rectal distension, but it has not successfully been applied to the anal canal. METHODS Nineteen healthy women received 30 RBDs in the rectum and the anal canal at intensities corresponding to sensory and unpleasantness thresholds, and response was recorded as cortical evoked potentials (CEPs) in 64-channels. The anal canal stimulations at unpleasantness level were repeated after 4 min to test the within-day reproducibility. CEPs were averaged, and to overcome latency variation related to jitter the spectral content of single sweeps was also computed. KEY RESULTS Repeated stimulation of the anal canal generated CEPs with similar latencies but smaller amplitudes compared to those from the rectum. Due to latency jitter, reproducibility of averaged CEPs was lower than what was found in the rectum. The most reproducible feature was N2P2 peak-to-peak amplitude with intra-class correlation coefficient (ICC) of 0.7 and coefficient of variation (CV) of 18%. Spectral content of the single sweeps showed reproducibility with ICCs for all bands >0.8 and corresponding CVs <7%. CONCLUSIONS & INFERENCES Cortical potentials evoked from the anal canal are challenged by latency jitter likely related to variability in muscle tone due to the distensions. Using single-sweep analysis, anal CEPs proved to be reproducible and should be used in future evaluation of the anal function.
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Affiliation(s)
- S Haas
- Department of Surgery, Aarhus University Hospital, Aarhus, Denmark
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Arendt-Nielsen L, Madsen H, Jarrell J, Gregersen H, Drewes AM. Pain evoked by distension of the uterine cervix in women with dysmenorrhea: evidence for central sensitization. Acta Obstet Gynecol Scand 2014; 93:741-8. [DOI: 10.1111/aogs.12403] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 04/10/2014] [Indexed: 12/15/2022]
Affiliation(s)
- Lars Arendt-Nielsen
- Center for Sensory-Motor Interactions (SMI); Department of Health Science and Technology; School of Medicine; Aalborg University; Aalborg Denmark
| | - Hans Madsen
- Department of Obstetrics and Gynecology; Aalborg University Hospital; Aalborg Denmark
| | - John Jarrell
- Calgary Chronic Pain Centre and Department of Obstetrics and Gynecology; University of Calgary; Calgary Alberta Canada
| | - Hans Gregersen
- Mech-Sense; Department of Gastroenterology; Aalborg University Hospital; Aalborg Denmark
| | - Asbjørn M. Drewes
- Center for Sensory-Motor Interactions (SMI); Department of Health Science and Technology; School of Medicine; Aalborg University; Aalborg Denmark
- Mech-Sense; Department of Gastroenterology; Aalborg University Hospital; Aalborg Denmark
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Hansen TM, Olesen AE, Simonsen CW, Drewes AM, Frøkjær JB. Cingulate metabolites during pain and morphine treatment as assessed by magnetic resonance spectroscopy. J Pain Res 2014; 7:269-76. [PMID: 24899823 PMCID: PMC4038455 DOI: 10.2147/jpr.s61193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Background Experimental investigation of cerebral mechanisms underlying pain and analgesia are important in the development of methods for diagnosis and treatment of pain. The aim of the current study was to explore brain metabolites in response to pain and treatment with morphine. Methods Proton magnetic resonance spectroscopy of the anterior cingulate cortex was performed in 20 healthy volunteers (13 males and seven females, aged 24.9±2.6 years) during rest and acute pain before and during treatment with 30 mg of oral morphine or placebo in a randomized, double-blinded, cross-over study design. Pain was evoked by skin stimulation applied to the right upper leg using a contact heat-evoked potential stimulator. Results Data from 12 subjects were valid for analysis. Painful stimulation induced an increase in N-acetylaspartate/creatine compared with rest (F=5.5, P=0.04). During treatment with morphine, painful stimulation induced decreased glutamate/creatine (F=7.3, P=0.02), myo-inositol/creatine (F=8.38, P=0.02), and N-acetylaspartate/creatine (F=13.8, P=0.004) concentrations, whereas an increase in the pain-evoked N-acetylaspartate/creatine concentration (F=6.1, P=0.04) was seen during treatment with placebo. Conclusion This explorative study indicates that neuronal metabolites in the anterior cingulate cortex, such as N-acetylaspartate, glutamate, and myo-inositol, could be related to the physiology of pain and treatment with morphine. This experimental method has the potential to enable the study of brain metabolites involved in pain and its treatment, and may in the future be used to provide further insight into these mechanisms.
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Affiliation(s)
- Tine Maria Hansen
- Mech-Sense, Department of Radiology, Aalborg University, Aalborg, Denmark
| | - Anne Estrup Olesen
- Mech-Sense, Department of Gastroenterology, Aalborg University, Aalborg, Denmark
| | | | - Asbjørn Mohr Drewes
- Mech-Sense, Department of Gastroenterology, Aalborg University, Aalborg, Denmark ; Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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Arendt-Nielsen L, Nielsen TA, Gazerani P. Translational pain biomarkers in the early development of new neurotherapeutics for pain management. Expert Rev Neurother 2014; 14:241-54. [PMID: 24490970 DOI: 10.1586/14737175.2014.884925] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Translation of the analgesic efficacy of investigational neurotherapeutics from pre-clinical pain models into clinical trial phases is associated with a high risk of failure. Application of human pain biomarkers in early stages of clinical trials can potentially enhance the rate of successful translation, which would eventually reduce both length and costs of drug development after the pre-clinical stage. Human pain biomarkers are based on the standardized activation of pain pathways followed by the assessment of ongoing and paroxysmal pain, plus evoked responses which can be applied to healthy individuals and patients prior to and after pharmacological interventions. This review discusses the rationality and feasibility of advanced human pain biomarkers in early phases of drug development for pain management which is still an unmet medical need.
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Affiliation(s)
- Lars Arendt-Nielsen
- Department of Health Science and Technology, Center for Sensory-Motor Interaction (SMI), Aalborg University, Fredrik Bajers Vej 7D-3, 9220 Aalborg East, Denmark
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Lelic D, Brock C, Simrén M, Frøkjaer JB, Søfteland E, Dimcevski G, Gregersen H, Drewes AM. The brain networks encoding visceral sensation in patients with gastrointestinal symptoms due to diabetic neuropathy. Neurogastroenterol Motil 2014; 26:46-58. [PMID: 24050116 DOI: 10.1111/nmo.12222] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 08/02/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND Increasing evidence points to association between long-term diabetes mellitus and abnormal brain processing. The aim of this study was to investigate central changes due to electrical stimulation in esophagus in patients with upper gastrointestinal (GI) symptoms due to diabetic neuropathy. METHODS Twenty-three diabetes patients with upper GI symptoms and 27 healthy controls were included. A standard ambulatory 24-h electrocardiography was carried out. 122-channel esophageal evoked brain potentials to electrical stimulation were acquired. Brain source/network analysis was performed. Gastroparesis Cardinal Symptom Index was used to evaluate upper GI symptoms and SF-36 questionnaire was utilized to assess patients' quality of life (QOL). KEY RESULTS Diabetes patients with GI symptoms showed modifications in three brain networks: (i) brainstem/operculum/frontal cortex, (ii) operculum/cingulate, and (iii) mid-cingulate/anterior-cingulate/operculum/deep limbic structures. Operculum brain source in patients was localized deeper and more anterior in all three networks. The shift of operculum source was correlated with the severity of upper GI symptoms, decreased heart beat-to-beat interval, and decreased SD of the intervals. The activation of the first network was delayed in patients. Operculum source had higher activity than cingulate in the second network in patients, and this was correlated with decreased physical QOL. Deep limbic source was localized deeper in patients, which also correlated with decreased physical QOL. CONCLUSIONS & INFERENCES This study indicates involvement of central nervous system in diabetes. Reorganization within opercular cortex was correlated with GI symptoms suggesting that operculo-cingulate cortex could contribute to development and maintenance of GI symptoms in diabetes patients.
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Affiliation(s)
- D. Lelic
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg Hospital; Aarhus University; Aalborg Denmark
| | - C. Brock
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg Hospital; Aarhus University; Aalborg Denmark
| | - M. Simrén
- Institute of Medicine; Department of Internal Medicine; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
| | - J. B. Frøkjaer
- Mech-Sense; Department of Radiology; Aalborg Hospital; Aarhus University Hospital; Aalborg Denmark
| | - E. Søfteland
- Department of Medicine; Haukeland University Hospital; Bergen Norway
- Institute of Medicine; University of Bergen; Bergen Norway
| | - G. Dimcevski
- Department of Medicine; Haukeland University Hospital; Bergen Norway
- Institute of Medicine; University of Bergen; Bergen Norway
| | - H. Gregersen
- Department of Medicine; GIOME and Sino-Danish Centre for Education and Research; Aarhus Denmark
| | - A. M. Drewes
- Mech-Sense; Department of Gastroenterology and Hepatology; Aalborg Hospital; Aarhus University; Aalborg Denmark
- Department of Health Science and Technology; Center for Sensory-Motor Interactions (SMI); Aalborg University; Aalborg Denmark
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Altomare A, Luca Guarino Sara Emerenziani MP, Cicala M, Drewes AM, Krarup AL, Brock C, Lottrup C, Frøkjaer JB, Souza RF, Nardone G, Compare D. Gastrointestinal sensitivity and gastroesophageal reflux disease. Ann N Y Acad Sci 2013; 1300:80-95. [PMID: 24117636 DOI: 10.1111/nyas.12236] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This paper reports on gastrointestinal sensitivity, including on the role of refluxate volume on the perception of reflux symptoms; experimental pain models that mimic mechanisms and symptoms of pain associated with esophageal diseases; the potential role of the acid receptor TRPV1 in the genesis of gastroesophageal reflux disease (GERD) symptoms; and roles for ATP and the purine and pyrimidine receptor subfamilies P1, P2X, and P2Y in the pathogenesis of GERD symptoms.
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Affiliation(s)
- Annamaria Altomare
- Department of Digestive Disease, Campus Bio-medico University, Rome, Italy
| | | | - Michele Cicala
- Department of Digestive Disease, Campus Bio-medico University, Rome, Italy
| | - Asbjørn Mohr Drewes
- Mech-Sense, Departments of Gastroenterology & Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Anne Lund Krarup
- Mech-Sense, Departments of Gastroenterology & Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Christina Brock
- Mech-Sense, Departments of Gastroenterology & Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Christian Lottrup
- Mech-Sense, Departments of Gastroenterology & Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Jens Brøndum Frøkjaer
- Mech-Sense, Departments of Gastroenterology & Radiology, Aalborg University Hospital, Aalborg, Denmark
| | - Rhonda F Souza
- Departments of Medicine, University of Texas Southwestern Medical Center and the VA North Texas Health Care System, Dallas, Texas
| | - Gerardo Nardone
- Department of Clinical and Experimental Medicine, Gastroenterology Unit, University "Federico II,", Naples, Italy
| | - Debora Compare
- Department of Clinical and Experimental Medicine, Gastroenterology Unit, University "Federico II,", Naples, Italy
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