1
|
Perlow HK, Nalin A, Ritter A, Addington M, Ward A, Liu M, Nappi C, Blakaj DM, Beyer S, Thomas EM, Grecula JC, Raval R, Kotecha R, Boulter D, Dawson E, Zoller W, Palmer JD. Advancing beyond the Hippocampus to Preserve Cognition for Patients with Brain Metastases: Dosimetric Results from a Phase 2 Trial of Memory-Avoidance Whole Brain Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:e145-e146. [PMID: 37784722 DOI: 10.1016/j.ijrobp.2023.06.960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Recent advances to preserve neurocognitive function in patients treated for brain metastases include stereotactic radiosurgery (SRS), hippocampal avoidance whole brain radiation therapy (HA-WBRT), and memantine administration. However, 23% of patients receiving HA-WBRT and memantine on NRG-CC001 still experienced executive function deterioration at 4 months, with 12% experiencing total recall and delayed recognition deterioration at 6 months. The hippocampus, corpus callosum, fornix, and amygdala are key neurocognitive substructures with a low propensity for brain metastases. Herein, we report our preliminary experience using an advanced "memory-avoidance" WBRT (MA-WBRT) approach sparing these substructures for patients with multiple (>15) brain metastases. MATERIALS/METHODS Ten consecutive patients treated with MA-WBRT on a phase 2 clinical trial (OSU-21074) were reviewed. In each patient, the hippocampi, amygdalae, corpus callosa, and fornix were contoured. Patients were not eligible for MA-WBRT if they had metastases in these substructures. A memory- avoidance region created using a 5mm volumetric expansion around these substructures. Hotspots were avoided in the hypothalamus and pituitary gland. Dose constraints for these avoidance structures were modeled after NRG CC-001 and include a D100% ≤ 9 Gy and a D0.03 cc ≤ 16 (acceptable to 20 Gy). Coverage of brain metastases was prioritized over memory avoidance dose constraints. Linac-based volumetric modulated arc therapy (VMAT) plans were generated for a prescription dose of 30 Gy in 10 fractions. RESULTS On average, the memory avoidance structure volume was 37.1 ccs (Range: 25.2-44.6 ccs), occupying 2.5% of the entire whole brain target volume. All treatment plans met the D100% dose constraint, and 8/10 plans met the D0.03cc constraint, with priority given to tumor coverage for the remaining 2 cases. VMAT spared the memory avoidance structures with a median dose range of 10.8-14.2 Gy and a maximum dose (D0.03cc) range of 15.6-22.7 Gy. The mean dose to the memory avoidance structures was 12.7 Gy (Range: 11.5-13.8 Gy). Target coverage (D98% > 25 Gy) and homogeneity (D2% ≤ 37.5 Gy) were achieved for all plans. CONCLUSION Modern VMAT techniques allow for sparing of the hippocampus, amygdala, corpus callosum, and fornix with good target coverage and homogeneity. Prospective quality of life and cognitive data including are being collected and include the Functional Assessment of Cancer Therapy - Brain (Fact-Br), Hopkins Verbal Learning Test (HLVT-R), Trail Making Test A/B (TMT-A/B) and Controlled Oral Word Association Test (COWAT). After enrollment is completed, these data will be evaluated to assess the efficacy of MA-WBRT to mitigate declines in quality of life and cognition after whole brain radiation.
Collapse
Affiliation(s)
- H K Perlow
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - A Nalin
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - A Ritter
- The Ohio State University, Columbus, OH
| | - M Addington
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - A Ward
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - M Liu
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - C Nappi
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - D M Blakaj
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - S Beyer
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - E M Thomas
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - J C Grecula
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - R Raval
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - R Kotecha
- Florida International University, Herbert Wertheim College of Medicine, Miami, FL
| | - D Boulter
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - E Dawson
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - W Zoller
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - J D Palmer
- Department of Radiation Oncology, The Ohio State University Wexner Medical Center, Columbus, OH
| |
Collapse
|
2
|
Lindelauf KHK, Baragona M, Baumann M, Maessen RTH, Ritter A. Pulse Parameters and Thresholds for (ir)Reversible Electroporation on Hepatocellular Carcinoma Cells in Vitro. Technol Cancer Res Treat 2023; 22:15330338221136694. [PMID: 36600679 PMCID: PMC9829997 DOI: 10.1177/15330338221136694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Hepatocellular carcinoma is a leading cause of cancer-related death in many parts of the world. Traditional treatment options are not always effective. During the promising minimally invasive electroporation-based therapies, biological cell membranes are exposed to an external, sufficiently high, pulsed electric field which creates so-called nanopores into the lipid bilayer of the cell membrane. These pores can either be permanent (irreversible electroporation (IRE)), leading to apoptosis, or repairable (reversible electroporation (RE)), with continued cell function. In tumor therapy, RE is used to increase the diffusion of a chemotherapeutic drug during electrochemotherapy. For both IRE and RE, the success of the treatment is dependent on application of the appropriate electric field. Therefore, this study aims to define the pulse parameters and thresholds for IRE and RE on hepatocellular carcinoma (HepG2) cells in-vitro.In a custom-made in-vitro setup, HepG2 cell viability (0, 5, 10, and 15 min), and the peak temperature were measured after electroporation with the different IRE and RE pulsing protocols, to determine the most successful settings for IRE and RE. A CAM/PI flow cytometric assay was performed to confirm cell permeabilization for the RE pulsing protocols with the highest cell viability.The results indicated that an IRE pulsing protocol (70 pulses, 100 µs pulse length, and 100 ms interval) with an electric field strength of 4000 V/cm was needed as threshold for almost complete cell death of HepG2 cells. A RE pulsing protocol (8 pulses, 100 µs pulse length, and 1000 ms interval) with an electric field strength of 1000 V/cm was needed as threshold for viable and permeabilized HepG2 cells. The low peak temperatures (max 30.1°C for IRE, max 23.1°C for RE) within this study indicated that the reduction in HepG2 cell viability was caused by the applied electric field and was not a result of Joule heating.
Collapse
Affiliation(s)
- K. H. K. Lindelauf
- Department of Diagnostic and Interventional Radiology,
University
Hospital RWTH Aachen, Aachen, Germany,Philips
Research, Eindhoven, the Netherlands,K. H. K. Lindelauf, Department of
Diagnostic and Interventional Radiology, University Hospital RWTH Aachen,
Aachen, Germany.
| | - M. Baragona
- Philips
Research, Eindhoven, the Netherlands
| | - M. Baumann
- Institute of Applied Medical Engineering,
RWTH Aachen
University, Aachen, Germany
| | | | - A. Ritter
- Department of Diagnostic and Interventional Radiology,
University
Hospital RWTH Aachen, Aachen, Germany
| |
Collapse
|
3
|
Prasad R, Ritter A, Royce T, Chino F, Jagsi R, Palmer J. Patient-Reported Economic Outcomes in Modern Radiotherapy Trials. Int J Radiat Oncol Biol Phys 2022. [DOI: 10.1016/j.ijrobp.2022.07.1688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
4
|
Romberg S, Solbach C, Louwen F, Yuan J, Ritter A. 257 Primary cilia in placental mesenchymal stem/stromal cells: Implication in placental development and preeclampsia. Eur J Obstet Gynecol Reprod Biol 2022. [DOI: 10.1016/j.ejogrb.2021.11.269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
5
|
Longhurst JK, Cummings JL, John SE, Poston B, Rider JV, Salazar AM, Mishra VR, Ritter A, Caldwell JZ, Miller JB, Kinney JW, Landers MR. Dual Task Performance Is Associated with Amyloidosis in Cognitively Healthy Adults. J Prev Alzheimers Dis 2022; 9:297-305. [PMID: 35543003 PMCID: PMC9286710 DOI: 10.14283/jpad.2022.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Preclinical Alzheimer's disease (AD) provides an opportunity for the study and implementation of interventions and strategies aimed at delaying, mitigating, and preventing AD. While this preclinical state is an ideal target, it is difficult to identify efficiently and cost-effectively. Recent findings have suggested that cognitive-motor dual task paradigms may provide additional inference. OBJECTIVES Investigate the relationship between dual task performance and amyloidosis, suggestive of preclinical Alzheimer's disease and whether dual task performance provides additional information beyond a cognitive composite, to help in the identification of amyloidosis. DESIGN Cross-sectional. SETTING Outpatient specialty brain health clinical research institution in the United States. PARTICIPANTS 52 cognitively healthy adults. MEASUREMENTS The data included demographics, amyloid standardized uptake value ratio obtained via florbetapir-PET, neuropsychological testing, apolipoprotien E genotype, and dual task performance measures. Data were analyzed via hierarchal multiple linear regression or logistic regression, controlling for age, education, and apolipoprotien E genotype. Receiver operating characteristic curves were plotted, and sensitivity and specificity calculated via 2x2 contingency tables. RESULTS There was a moderate relationship (rs>.30) between motor and cognitive dual task effects and amyloid standardized uptake value ratio (ps<.042). A strong relationship (r=.58) was found between combined dual task effect, a measure of automaticity derived from dual task performance, and amyloid standardized uptake value ratio (p<.001). Additionally, combined dual task effect showed promise in its unique contributions to amyloid standardized uptake value ratio, accounting for 7.8% of amyloid standardized uptake value ratio variance beyond cognitive composite scores (p=.018). Additionally, when incorporated into the cognitive composite, combined dual task effect resulted in improved diagnostic accuracy for determining elevated amyloid standardized uptake value ratio, and increased the sensitivity and specificity of the cognitive composite. CONCLUSSION Dual task performance using the combined dual task effect, a measure of automaticity, was a moderate predictor of cerebral amyloidosis, which suggests that it has utility in the screening and diagnosis of individuals for preclinical AD. Additionally, when combined with the cognitive composite, the combined dual task effect improves diagnostic accuracy. Further research is warranted.
Collapse
Affiliation(s)
- J K Longhurst
- Jason K. Longhurst, PT, DPT, PHD, Department of Physical Therapy and Athletic Training, Saint Louis University, Saint Louis, Missouri, USA, 63104, , tel: 314-977-8533, fax: 314-977-8513
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Kölbener P, Ritter A, Corradini F, Baumann U, Cook AM. Refractory organic carbon and sulfur in the biotransformed by-products in commercial linear alkylbenzenesulfonate (LAS). TENSIDE SURFACT DET 2021. [DOI: 10.1515/tsd-1996-330212] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
7
|
van de Ven K, Ritter A, Vuong T, Livingston M, Berends L, Chalmers J, Dobbins T. A comparison of structural features and vulnerability between government and nongovernment alcohol and other drug (AOD) treatment providers. J Subst Abuse Treat 2021; 132:108467. [PMID: 34098205 DOI: 10.1016/j.jsat.2021.108467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 04/13/2021] [Accepted: 04/30/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Both public (government-run), and not-for-profit (nongovernment) service providers provide alcohol and other drug (AOD) treatment services. Research has rarely studied the structural features of these providers, such as workforce characteristics, procurement arrangements, and funding security. The study reported here sought to document and analyze the differences between these two AOD treatment provider types in Australia. METHODS The study administered an online survey instrument targeted at managers of AOD treatment sites. The survey comprised three sections: (1) the service (e.g., treatment types); (2) workforce (e.g., total number of staff); and (3) funding and procurement arrangements (e.g., contract length). The study completed a total of 207 site surveys. The studied compared government and nongovernment services on structural features that may create a more or less sustainable or vulnerable service (funding arrangements, payment mechanisms, and contract length). RESULTS Government providers were more likely to provide medically oriented treatment types such as withdrawal management and pharmacotherapy, whereas nongovernment organization (NGO) providers were more likely to offer rehabilitation. Consistent with this, government services were more likely to employ medical professionals and nurses, indicative of a more medically oriented workforce, while NGO services were more likely to employ AOD workers, youth workers, peer workers, and counselors. Our data illustrate that NGO services were more likely to be subject to competitive tendering and to have shorter contract lengths, compared with government services, and overall to be more structurally vulnerable. CONCLUSION Despite the reliance on NGOs to provide the majority of specialist care (71% of all treatment episodes in Australia), these services are more vulnerable than their government counterparts. To ensure that a comprehensive suite of treatment services is available, procurement arrangements that support stability and security in nongovernment service providers and government service providers are essential.
Collapse
Affiliation(s)
- K van de Ven
- Centre for Rural Criminology, School of Humanities, Arts, and Social Sciences, University of New England, Armidale, New South Wales, Australia; Drug Policy Modelling Program, Social Policy Research Centre, UNSW, Sydney, NSW, Australia.
| | - A Ritter
- Drug Policy Modelling Program, Social Policy Research Centre, UNSW, Sydney, NSW, Australia
| | - T Vuong
- Drug Policy Modelling Program, Social Policy Research Centre, UNSW, Sydney, NSW, Australia
| | - M Livingston
- Centre for Alcohol Policy Research, La Trobe University, Melbourne, Australia
| | - L Berends
- TRACE Research; National Drug and Research Centre, UNSW, Australia
| | - J Chalmers
- National Drug and Alcohol Research Centre, University of New South Wales, Sydney, Australia
| | - T Dobbins
- School of Public Health and Community Medicine, UNSW, Sydney, Australia
| |
Collapse
|
8
|
Sreenivasan K, Zhuang X, Longhurst J, Yang Z, Cordes D, Ritter A, Caldwell J, Mari Z, Litvan I, Bluett B, Mishra V. Resting state functional connectivity in levodopa non responsive Parkinson's disease patients with freezing of gait. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
9
|
Emons J, Fasching PA, Wunderle M, Heindl F, Rieger J, Horn F, Pelzer G, Ritter A, Weber T, Radicke M, Polifka I, Wachter DL, Wenkel E, Michel T, Uder M, Hartmann A, Anton G, Beckmann MW, Schulz-Wendtland R, Jud SM. Assessment of the additional clinical potential of X-ray dark-field imaging for breast cancer in a preclinical setup. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- J Emons
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| | - PA Fasching
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| | - M Wunderle
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| | - F Heindl
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| | - J Rieger
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - F Horn
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - G Pelzer
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - A Ritter
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - T Weber
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | | | - I Polifka
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Pathology
| | - DL Wachter
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Pathology
| | - E Wenkel
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Radiologie
| | - T Michel
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - M Uder
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Radiologie
| | - A Hartmann
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Pathology
| | - G Anton
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics
| | - MW Beckmann
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| | | | - SM Jud
- Friedrich-Alexander-Universität Erlangen-Nürnberg
| |
Collapse
|
10
|
Mishra V, Sreenivasan K, Cordes D, Ritter A, Miller J, Mari Z, Litvan I, Caldwell J. Investigating the sensitivity of free-water corrected diffusion-weighted MRI measures to understand sex-specific alterations in Parkinson's disease with mild cognitive impairment. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
11
|
Berner K, Hirschfeld M, Rücker G, Weiß D, Ritter A, Juhasz-Böss I, Erbes T. Urinary exosomal microRNAs as potential non-invasive biomarkers in breast cancer detection. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- K Berner
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
| | - M. Hirschfeld
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
- Institut für Veterinärmedizin, Georg-August-Universität Goettingen
| | - G Rücker
- Medizinische Fakultät, Universität Freiburg
- Institut für medizinische Biometrie und Statistic, Universität Freiburg
| | - D Weiß
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
| | - A Ritter
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
| | - I Juhasz-Böss
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
| | - T Erbes
- Universitätsfrauenklinik Freiburg
- Medizinische Fakultät, Universität Freiburg
| |
Collapse
|
12
|
Vatankhah M, Kobravi H, Ritter A. Bio-inspired Model of Humanoid Robot for Ascending Movement. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:5287-5290. [PMID: 31947050 DOI: 10.1109/embc.2019.8856988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Stair climbing is one of the important daily life activities that biped robots have to carry out. However, the number of researches study the ascending movement mechanisms and its stability is low. In this study, we have inspired by human ascending movement underlying mechanisms and developed a new control law based on the nature of the human motor behavior. This model has been developed in phase space using an intermittent sliding mode controller to give stable control and eliminate the effect of the system's uncertainty. A planar five-link biped model has been used to test the model. The embedded space and controller has been formed for each joint separately. Therefore, in this case, the position of each angle in embedded space gets compared along time with its corresponding desired dynamic. The position of each angle in space regarding its corresponding reference trajectory made the error signal. Results show that the designed sliding mode controllers successfully keeps the trajectory near the desired dynamics, and the output follows the desired dynamic very well.
Collapse
|
13
|
Hawley N, Bennett L, Ritter A. C-03 The sensitivity and specificity of the Montreal Cognitive Assessment is Age Dependent for Amyloid Positivity in a Mixed Clinical Sample. Arch Clin Neuropsychol 2019. [DOI: 10.1093/arclin/acz034.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Objective
The Montreal Cognitive Assessment (MoCA) is a widely-used screening tool for neurodegenerative disorders. Despite widespread use, there have been few investigations into correlations between MoCA and biomarkers of Alzheimer's disease pathology. This study examined the relationship between MoCA performance and the presence of amyloid as detected by positron emission tomography (PET).
Methods
Sensitivity and specificity for the total MoCA score were determined for 76 individuals (26 amyloid-negative, 50 amyloid- positive) who were between the ages of 55 and 90 and diagnosed with MCI or mild dementia with a CDR score of 0-1 and were participating in a longitudinal, observational study at the Cleveland Clinic Lou Ruvo Center for Brain Health. All individuals underwent an amyloid PET scan and cognitive screening.
Results
Sensitivity and specificity for the total score were determined using amyloid positivity as the standard. A cutpoint of 25 yielded the best balance between sensitivity and specificity (74% and 74%, respectively). A total score of 27 was required to achieve 90% sensitivity to identify amyloid positive individuals (i.e. only a 10% risk that individuals with a score of 28-30 have a positive scan). A score of 26 was required in individuals over the age of 75.
Conclusions
With the emergence of new diagnostic biomarkers, there is need to define the utility of affordable, widely-available screening tools. In this mixed clinical sample, the MoCA score showed good sensitivity for detecting amyloid pathology but with low specificity. Thus a total MoCA score of 28 is needed to confidently rule out risk for AD pathology.
Collapse
|
14
|
Hawley N, Bennett L, Ritter A. C-02 An Unbiased Biomarker Approach to Neuropsychological, Behavioral, and Psychiatric Symptoms in a Mixed Clinical Sample. Arch Clin Neuropsychol 2019. [DOI: 10.1093/arclin/acz034.164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Objective
Suspected Non-Alzheimer’s Pathology (SNAPs) are individuals who present with a cognitive syndrome meeting clinical criteria for Alzheimer’s disease (AD) but are found to lack underlying AD pathology. Current clinical criteria for AD lack specificity in predicting underlying neurodegenerative pathology. With the advent of amyloid positron emission tomography (PET) the presence of amyloid pathology can now be identified in vivo. Using a biomarker-based approach, we aimed to characterize the neuropsychological, behavioral, and psychiatric profile of SNAPs in contrast to those with AD pathology (APs).
Method
76 individuals (26 amyloid-negative [SNAPs], 50 amyloid- positive [APs]) completed neuropsychological testing and a PET amyloid scan as a part of a longitudinal observational study at the Cleveland Clinic LRCBH. Individuals meeting NIA-A criteria for MCI or mild AD with a Clinical Dementia Rating score of .05 -1 were included. Amyloid status was determined via clinical read of two clinicians trained in reading amyloid scans (neuroradiologist and neuropsychiatrist). Independent samples t tests assessed group differences between SNAPs and APs across cognitive, behavioral, and psychiatric measures.
Results
Mini-Mental State Examination scores were equivalent between SNAPs and APs. SNAPs performed significantly better on measures of verbal and nonverbal memory, set-shifting, and semantic fluency, as well as aspects of processing speed and working memory (all p’s < .05). Additionally, SNAPs endorsed more RBD symptoms (p < .05). No significant group differences were observed across neuropsychiatric or functional measures.
Conclusion(s)
Differences in an individual’s neuropsychological, behavioral, and psychiatric profile in consideration with a biomarker approach may provide key insights and afford greater diagnostic clarity.
Collapse
|
15
|
Shyamsundar P, Springer NP, Tallis H, Polasky S, Jat ML, Sidhu HS, Krishnapriya PP, Skiba N, Ginn W, Ahuja V, Cummins J, Datta I, Dholakia HH, Dixon J, Gerard B, Gupta R, Hellmann J, Jadhav A, Jat HS, Keil A, Ladha JK, Lopez-Ridaura S, Nandrajog SP, Paul S, Ritter A, Sharma PC, Singh R, Singh D, Somanathan R. Fields on fire: Alternatives to crop residue burning in India. Science 2019; 365:536-538. [DOI: 10.1126/science.aaw4085] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
16
|
Farris J, Ritter A, Craig M, Shah N, Veltri L, Kanate A, Ross K, Vargo J. Patterns of Relapse after Salvage Autologous Hematopoietic Cell Transplantation for Hodgkin’s Lymphoma: Should Sites of Relapse Relative to Initially Involved Sites Be Used to Guide Indications for Peritransplant Radiation Therapy. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
17
|
Mahar AL, El-Sedfy A, Dixon M, Siddiqui M, Elmi M, Ritter A, Vasilevska-Ristovska J, Jeong Y, Helyer L, Law C, Zagorski B, Coburn NG. Geographic variation in surgical practice patterns and outcomes for resected nonmetastatic gastric cancer in Ontario. ACTA ACUST UNITED AC 2018; 25:e436-e443. [PMID: 30464695 DOI: 10.3747/co.25.3953] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Background Gastrectomy with negative resection margins and adequate lymph node dissection is the cornerstone of curative treatment for gastric cancer (gc). However, gastrectomy is a complex and invasive operation with significant morbidity and mortality. Little is known about surgical practice patterns or short- and long-term outcomes in early-stage gc in Canada. Methods We undertook a population-based retrospective cohort study of patients with gc diagnosed between 1 April 2005 and 31 March 2008. Chart review provided clinical and operative details such as disease stage, primary tumour location, surgical approach, operation, lymph nodes, and resection margins. Administrative data provided patient demographics, geography, and vital status. Variations in treatment and outcomes were compared for 14 local health integration networks. Descriptive statistics and log-rank tests were used to examine geographic variation. Results We identified 722 patients with nonmetastatic resected gc. We documented significant provincial variation in case mix, including primary tumour location, stage at diagnosis, and tumour grade. Short-term surgical outcomes varied across the province. The percentage of patients with 15 or fewer lymph nodes removed and examined varied from 41.8% to 73.8% (p = 0.02), and the rate of positive surgical margins ranged from 15.2% to 50.0% (p = 0.002). The 30-day surgical mortality rates did not vary statistically significantly across the province (p = 0.13); however, rates ranged from 0% to 16.7%. Overall 5-year survival was 44% and ranged from 31% to 55% across the province. Conclusions This cohort of patients with resected stages i-iii gc is the largest analyzed in Canada, providing important historical information about treatment outcomes. Understanding the causes of regional variation will support interventions aiming to improve gc operative outcomes in the cancer system.
Collapse
Affiliation(s)
- A L Mahar
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB.,Institute for Clinical Evaluative Sciences, University of Toronto, Toronto, ON
| | - A El-Sedfy
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB
| | - M Dixon
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB.,Department of Surgery, University of Toronto, Toronto, ON
| | - M Siddiqui
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB
| | - M Elmi
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB
| | - A Ritter
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB
| | | | - Y Jeong
- Department of Community Health Sciences, University of Manitoba, Winnipeg, MB.,Institute for Clinical Evaluative Sciences, University of Toronto, Toronto, ON.,Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, ON
| | - L Helyer
- Department of Surgery, Dalhousie University, Halifax, NS
| | - C Law
- Department of Surgery, University of Toronto, Toronto, ON.,Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, ON.,Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, ON
| | - B Zagorski
- Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, ON
| | - N G Coburn
- Department of Surgery, University of Toronto, Toronto, ON.,Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, ON.,Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, ON
| |
Collapse
|
18
|
Emons J, Wunderle M, Emons PA, Heindl F, Rieger J, Horn F, Pelzer G, Ritter A, Weber T, Radicke M, Polifka I, Wachter DL, Wenkel E, Michel T, Uder M, Hartmann A, Anton G, Beckmann MW, Schulz-Wendtland R, Jud SM. Assessment of clinical potential of X-ray dark-field imaging for breast cancer. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- J Emons
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| | - M Wunderle
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| | - PA Emons
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| | - F Heindl
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| | - J Rieger
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - F Horn
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - G Pelzer
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - A Ritter
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - T Weber
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - M Radicke
- Siemens Healthcare GmbH, Erlangen, Deutschland
| | - I Polifka
- Universitätsklinikum Erlangen, Pathologie, Erlangen, Deutschland
| | - DL Wachter
- Universitätsklinikum Erlangen, Pathologie, Erlangen, Deutschland
| | - E Wenkel
- Universitätsklinikum Erlangen, Radiologie, Erlangen, Deutschland
| | - T Michel
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - M Uder
- Universitätsklinikum Erlangen, Radiologie, Erlangen, Deutschland
| | - A Hartmann
- Universitätsklinikum Erlangen, Pathologie, Erlangen, Deutschland
| | - G Anton
- Physikalisches Institut, Lehrstuhl für Experimentalphysik (Teilchen- und Astroteilchenphysik), Erlangen, Deutschland
| | - MW Beckmann
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| | | | - SM Jud
- Universitätsklinikum Erlangen, Frauenklinik, Erlangen, Deutschland
| |
Collapse
|
19
|
Ritter A, Friemel A, Kreis NN, Hoock SC, Roth S, Kielland-Kaisen U, Brüggmann D, Solbach C, Louwen F, Yuan J. Primary cilia are dysfunctional in obese adipose-derived mesenchymal stem cells. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- A Ritter
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - A Friemel
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - NN Kreis
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - SC Hoock
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - S Roth
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - U Kielland-Kaisen
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - D Brüggmann
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - C Solbach
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - F Louwen
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - J Yuan
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| |
Collapse
|
20
|
Hoock SC, Kreis NN, Ritter A, Friemel A, Solbach C, Yuan J, Louwen F. The role of RITA in migration of breast cancer cells. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- SC Hoock
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - NN Kreis
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - A Ritter
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - A Friemel
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - C Solbach
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - J Yuan
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| | - F Louwen
- Universitätsklinikum Frankfurt, ZFG – Molekulare Geburtshilfe, Frankfurt am Main, Deutschland
| |
Collapse
|
21
|
Ritter A, Louwen F, Yuan J. Deficient primary cilia in obese adipose-derived mesenchymal stem cells: obesity, a secondary ciliopathy? Obes Rev 2018; 19:1317-1328. [PMID: 30015415 DOI: 10.1111/obr.12716] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 04/24/2018] [Accepted: 05/09/2018] [Indexed: 12/14/2022]
Abstract
Obesity alters the composition, structure and function of adipose tissue, characterized by chronic inflammation, insulin resistance and metabolic dysfunction. Adipose-derived mesenchymal stem cells (ASCs) are responsible for cell renewal, spontaneous repair and immunomodulation in adipose tissue. Increasing evidence highlights that ASCs are deficient in obesity, and the underlying mechanisms are not well understood. We have recently shown that obese ASCs have defective primary cilia, which are shortened and unable to properly respond to stimuli. Impaired cilia compromise ASC functions. This work suggests an intertwined connection of obesity, defective cilia and dysfunctional ASCs. We have here discussed the current data regarding defective cilia in various cell types in obesity. Based on these observations, we hypothesize that obesity, a systemic chronic metainflammation, could impair cilia in diverse ciliated cells, like pancreatic islet cells, stem cells and hypothalamic neurons, making these critical cells dysfunctional by shutting down their signal sensors and transducers. In this context, obesity may represent a secondary form of ciliopathy induced by obesity-related inflammation and metabolic dysfunction. Reactivation of ciliated cells might be an alternative strategy to combat obesity and its associated diseases.
Collapse
Affiliation(s)
- A Ritter
- Department of Gynecology and Obstetrics, University Hospital, Goethe University Frankfurt, Frankfurt, Germany
| | - F Louwen
- Department of Gynecology and Obstetrics, University Hospital, Goethe University Frankfurt, Frankfurt, Germany
| | - J Yuan
- Department of Gynecology and Obstetrics, University Hospital, Goethe University Frankfurt, Frankfurt, Germany
| |
Collapse
|
22
|
Abstract
Obesity is associated with a variety of disorders including cardiovascular diseases, diabetes mellitus and cancer. Obesity changes the composition and structure of adipose tissue, linked to pro-inflammatory environment, endocrine/metabolic dysfunction, insulin resistance and oxidative stress. Adipose-derived mesenchymal stem cells (ASCs) have multiple functions like cell renewal, spontaneous repair and homeostasis in adipose tissue. In this review article, we have summarized the recent data highlighting that ASCs in obesity are defective in various functionalities and properties including differentiation, angiogenesis, motility, multipotent state, metabolism and immunomodulation. Inflammatory milieu, hypoxia and abnormal metabolites in obese tissue are crucial for impairing the functions of ASCs. Further work is required to explore the precise molecular mechanisms underlying its alterations and impairments. Based on these data, we suggest that deregulated ASCs, possibly also other mesenchymal stem cells, are important in promoting the development of obesity. Restoration of ASCs/mesenchymal stem cells might be an additional strategy to combat obesity and its associated diseases.
Collapse
Affiliation(s)
- F Louwen
- Department of Gynecology and Obstetrics, J. W. Goethe-University, Frankfurt, Germany
| | - A Ritter
- Department of Gynecology and Obstetrics, J. W. Goethe-University, Frankfurt, Germany
| | - N N Kreis
- Department of Gynecology and Obstetrics, J. W. Goethe-University, Frankfurt, Germany
| | - J Yuan
- Department of Gynecology and Obstetrics, J. W. Goethe-University, Frankfurt, Germany
| |
Collapse
|
23
|
Jasmer B, Muschol-Steinmetz C, Kreis NN, Steinhäuser K, Ritter A, Friemel A, Yuan J, Louwen F. The function of B-cell lymphoma 6 in trophoblastic cells. Geburtshilfe Frauenheilkd 2016. [DOI: 10.1055/s-0036-1592904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
|
24
|
Zhao T, Mistry N, Ritter A, Sun B, Li H, Mutic S. Dosimetric Evaluation of Direct Electron Density Computed Tomography Images for Simplification of Treatment Planning Workflow. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
25
|
Leary SM, Liu C, Cheesman AL, Ritter A, Thompson S, Greenwood R. Incontinence after brain injury: prevalence, outcome and multidisciplinary management on a neurological rehabilitation unit. Clin Rehabil 2016; 20:1094-9. [PMID: 17148521 DOI: 10.1177/0269215506071258] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective: To investigate the prevalence, outcome and multidisciplinary management of incontinence in patients with acquired brain injury. Design: Retrospective case notes review. Setting: Regional neurological rehabilitation unit. Subjects: Two hundred and thirty-eight patients with acquired brain injury. Main measures: Bladder and bowel subscores of the Barthel Index and Functional Independence Measure; number of multidisciplinary goals addressing bladder and bowel function. Results: Fifty per cent of patients (n=112) had impaired bladder or bowel subscores on admission. Significant improvement was seen at discharge but 36% of patients (n=77) still had some degree of impairment. Over 90% of patients were set multidisciplinary goals addressing self-care (n=213) and mobility (n=205) but only 3.5% (n=8) were set multidisciplinary goals addressing bladder and bowel function. Conclusions: Incontinence was common in patients with brain injury on a neurological rehabilitation unit. Significant improvement was seen following rehabilitation. Bladder and bowel management was not well incorporated into the multidisciplinary management process.
Collapse
Affiliation(s)
- S M Leary
- Regional Neurological Rehabilitation Unit, Homerton University Hospital and National Hospital for Neurology and Neurosurgery, University College London Hospitals, Queen Square, London, UK.
| | | | | | | | | | | |
Collapse
|
26
|
Li H, Dolly S, Zhao T, Ritter A, Mistry N, Colombo V, Raupach R, Huenemohr N, Yu L, Anastasio M, Mutic S. TH-CD-202-02: A Preliminary Study Evaluating Beam-Hardening Artifact Reduction On CT Direct Electron-Density Images. Med Phys 2016. [DOI: 10.1118/1.4958157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
27
|
Arling V, Knispel J, Ritter A, Baumann M. Does enhancing consciousness for strategic planning processes support the effectiveness of problem-based learning concepts in biomedical education? Current Directions in Biomedical Engineering 2015. [DOI: 10.1515/cdbme-2016-0001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Interdisciplinary skills gain increasing importance in university and professional contexts. To support these interdisciplinary skills, problem-based learning (PBL) is regularly used in a course for biomedical education. In this study, we investigated whether enhancing consciousness for planning processes can support the effectiveness of PBL concepts in an intervention-control group design. Results indicated clear evidence for this: planning skills were associated with better PBL performance. Concluding, self-reflection of planning skills is useful to increase outcome performance of students in PBL courses.
Collapse
Affiliation(s)
- V. Arling
- Institut für Psychologie, Jägerstraße 17-19, 52066 Aachen
| | - J. Knispel
- Institut für Psychologie, Jägerstraße 17-19, 52066 Aachen
| | - A. Ritter
- Applied Medical Engineering (Biophysical & Education Engineering), Pauwelsstraße 20, 52074 Aachen
| | - M. Baumann
- Applied Medical Engineering (Biophysical & Education Engineering), Pauwelsstraße 20, 52074 Aachen
| |
Collapse
|
28
|
Sonntag D, Ritter A, Burkhart A, Fischer J, Mondrzyk A, Ritter H. Experimental amine-epoxide sealer: a physicochemical study in comparison with AH Plus and EasySeal. Int Endod J 2014; 48:747-56. [DOI: 10.1111/iej.12372] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 08/09/2014] [Indexed: 11/30/2022]
Affiliation(s)
- D. Sonntag
- Poliklinik für Zahnerhaltung, Parodontologie und Endodontologie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| | - A. Ritter
- Poliklinik für Zahnerhaltung, Parodontologie und Endodontologie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| | - A. Burkhart
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| | - J. Fischer
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| | - A. Mondrzyk
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| | - H. Ritter
- Institut für Organische Chemie und Makromolekulare Chemie; Heinrich-Heine-Universitaet Duesseldorf; Duesseldorf Germany
| |
Collapse
|
29
|
Sanhaji M, Ritter A, Belsham HR, Friel CT, Roth S, Yuan J, Louwen F. Mitotic regulation of the mitotic centromere-associated kinesin. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
|
30
|
Potzinger P, Ritter A, Krause J. Massenspektrometrische Bestimmung von Bindungsenergien in siliciumorganischen Verbindungen / Mass-spectrometric Determination of Bond Dissoziation Energies in Organosilicon Compounds. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1975-0314] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The appearance potentials for a large number of organosilicon ions have been measured. Combination of these values with thermochemical heats of combustion allow the determination of bond energy terms which may be used to calculate heats of formation for all silicon compounds containing hydrogen, alkyl and chlorine ligands. The bond dissoziation energies D(Si - H)= 89 ± 4, D(Si - C) = 85 ± 4 and D (Si - Si) =75 ± 8 kcal/Mol were found to be independent of the number of methylgroups attached to silicon. In addition the Si - Cl bond energy was found to be 116 and 104 kcal/Mol in (CH3)3SiCl and Cl3SiCl respectively.
Collapse
Affiliation(s)
- P. Potzinger
- Institut für Strahlenchemie im Max-Planck-Institut für Kohlenforschung, Mülheim a. d. Ruhr
| | - A. Ritter
- Institut für Strahlenchemie im Max-Planck-Institut für Kohlenforschung, Mülheim a. d. Ruhr
| | - J. Krause
- Institut für Strahlenchemie im Max-Planck-Institut für Kohlenforschung, Mülheim a. d. Ruhr
| |
Collapse
|
31
|
Gardères J, Henry J, Bernay B, Ritter A, Zatylny-Gaudin C, Wiens M, Müller WEG, Le Pennec G. Cellular effects of bacterial N-3-Oxo-dodecanoyl-L-Homoserine lactone on the sponge Suberites domuncula (Olivi, 1792): insights into an intimate inter-kingdom dialogue. PLoS One 2014; 9:e97662. [PMID: 24858701 PMCID: PMC4032237 DOI: 10.1371/journal.pone.0097662] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 04/22/2014] [Indexed: 11/30/2022] Open
Abstract
Sponges and bacteria have lived together in complex consortia for 700 million years. As filter feeders, sponges prey on bacteria. Nevertheless, some bacteria are associated with sponges in symbiotic relationships. To enable this association, sponges and bacteria are likely to have developed molecular communication systems. These may include molecules such as N-acyl-L-homoserine lactones, produced by Gram-negative bacteria also within sponges. In this study, we examined the role of N-3-oxododecanoyl-L-homoserine lactone (3-oxo-C12-HSL) on the expression of immune and apoptotic genes of the host sponge Suberites domuncula. This molecule seemed to inhibit the sponge innate immune system through a decrease of the expression of genes coding for proteins sensing the bacterial membrane: a Toll-Like Receptor and a Toll-like Receptor Associated Factor 6 and for an anti-bacterial perforin-like molecule. The expression of the pro-apoptotic caspase-like 3/7 gene decreased as well, whereas the level of mRNA of anti-apoptotic genes Bcl-2 Homolog Proteins did not change. Then, we demonstrated the differential expression of proteins in presence of this 3-oxo-C12-HSL using 3D sponge cell cultures. Proteins involved in the first steps of the endocytosis process were highlighted using the 2D electrophoresis protein separation and the MALDI-TOF/TOF protein characterization: α and β subunits of the lysosomal ATPase, a cognin, cofilins-related proteins and cytoskeleton proteins actin, α tubulin and α actinin. The genetic expression of some of these proteins was subsequently followed. We propose that the 3-oxo-C12-HSL may participate in the tolerance of the sponge apoptotic and immune systems towards the presence of bacteria. Besides, the sponge may sense the 3-oxo-C12-HSL as a molecular evidence of the bacterial presence and/or density in order to regulate the populations of symbiotic bacteria in the sponge. This study is the first report of a bacterial secreted molecule acting on sponge cells and regulating the symbiotic relationship.
Collapse
Affiliation(s)
- Johan Gardères
- Université de Bretagne-Sud, Laboratoire de Biotechnologie et de Chimie Marines, EA 3884, Institut Universitaire Européen de la Mer, Lorient, France
| | - Joël Henry
- Laboratoire des Mollusques Marins et des Ecosystèmes associés, CNRS INEE FRE 3484, Université de Caen Basse-Normandie, Caen, France
| | - Benoit Bernay
- Post Genomic Platform PROTEOGEN, SF ICORE 4206, Université de Caen Basse-Normandie, Caen, France
| | - Andrès Ritter
- Pontificia Universidad Católica de Chile - Departamento de Ecología Facultad de Ciencias Biológicas - Santiago - Chile
| | - Céline Zatylny-Gaudin
- Laboratoire des Mollusques Marins et des Ecosystèmes associés, CNRS INEE FRE 3484, Université de Caen Basse-Normandie, Caen, France
| | - Matthias Wiens
- European Research Council Advanced Investigator Grant Research Group at Institute for Physiological Chemistry, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Werner E. G. Müller
- European Research Council Advanced Investigator Grant Research Group at Institute for Physiological Chemistry, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Gaël Le Pennec
- Université de Bretagne-Sud, Laboratoire de Biotechnologie et de Chimie Marines, EA 3884, Institut Universitaire Européen de la Mer, Lorient, France
- * E-mail:
| |
Collapse
|
32
|
Franz M, Ritter A, Puta C, Nötzel D, Miltner WHR, Weiss T. Laser heat hyperalgesia is not a feature of non-specific chronic low back pain. Eur J Pain 2014; 18:1501-8. [PMID: 24842773 DOI: 10.1002/ejp.535] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/08/2014] [Indexed: 11/06/2022]
Abstract
BACKGROUND Based upon studies using mechanical pin-prick, pressure, electrical or heat stimuli applied to painful and/or pain-free parts of the body, chronic low back pain (CLBP) has been shown to be associated with generalized and enhanced pain sensitivity and altered brain responses to noxious stimuli. To date, no study examined the processing of noxious laser heat pulses, which are known to selectively excite thermal nociceptors located in the superficial skin layers, in CLBP. METHODS We studied laser heat pain thresholds (LHPTs) and nociceptive laser-evoked brain electrical potentials (LEPs) following skin stimulation of the pain-affected back and the pain-free abdomen using noxious laser heat stimulation in 16 CLBP patients and 16 age- and gender-matched healthy controls (HCs). RESULTS We observed no statistically significant differences in LHPTs between CLBP patients and HCs, neither on the back nor on the abdomen. Furthermore, we found no evidence for altered brain responses between CLBP patients and HCs in response to stimulation of the back and abdomen in single-trial latencies and amplitudes of LEP components (N2, P2). CONCLUSION The results are in contrast to previous studies showing hypersensitivity to different experimental noxious stimuli (e.g., contact heat). We argue that these discrepancies may be due to low spatial and temporal summation within the central nervous system following laser heat stimulation. Our results indicate important methodological differences between laser heat and thermode stimulation that should be taken into account when interpreting results, such as from thermal quantitative sensory testing.
Collapse
Affiliation(s)
- M Franz
- Department of Biological and Clinical Psychology, Friedrich Schiller University of Jena, Germany
| | | | | | | | | | | |
Collapse
|
33
|
Zubedat S, Freed Y, Eshed Y, Cymerblit-Sabba A, Ritter A, Nachmani M, Harush R, Aga-Mizrachi S, Avital A. Plant-derived nanoparticle treatment with cocc 30c ameliorates attention and motor abilities in sleep-deprived rats. Neuroscience 2013; 253:1-8. [DOI: 10.1016/j.neuroscience.2013.08.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 08/12/2013] [Accepted: 08/13/2013] [Indexed: 10/26/2022]
|
34
|
Alcalai R, Hirsh-Rokach B, Shai E, Lotan A, Ritter A, Varon D, Spectre G. Differential impact of SSRIs on platelet response to clopidogrel: a randomized, double-blind, crossover trial. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
35
|
Ritter A, Adar T. [How to integrate medical ethics into medical education during residency training?]. Harefuah 2013; 152:421-422. [PMID: 23957091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
|
36
|
Bruners P, Isfort P, Ritter A, Baumann M, Penzkofer T, Schmitz-Rode T, Kuhl CK, Mahnken AH. Entwicklung und erste ex-vivo Versuche eines Prototypen zur interstitiellen Elektrochemotherapie. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
37
|
Abstract
A 45-year-old female patient from Bosnia complained of recurrent swelling and redness of the upper eyelid and 24 h later the patient consulted the Salzburg eye hospital because of a subconjunctival swelling. The slit lamp investigation showed a living Dirofilaria repens which could be removed by forceps. On the basis of this case the infection pathway, possible increasing incidence and therapy are discussed.
Collapse
Affiliation(s)
- A Ritter
- Universitätsklinik für Augenheilkunde und Optometrie der PMU Salzburg, Müllner Hauptstrasse 48, Salzburg, Austria.
| | | | | |
Collapse
|
38
|
Ritter A, Baumann M, Menzel M, Bruners B, Pfeffer J, Schmitz-Rode T, Mahnken AH. Fem-Driven Parameter Optimization of an Electrochemotherapy Catheter Prototype. BIOMED ENG-BIOMED TE 2013; 58 Suppl 1:/j/bmte.2013.58.issue-s1-N/bmt-2013-4339/bmt-2013-4339.xml. [DOI: 10.1515/bmt-2013-4339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
39
|
Ritter A, Baumann M, Bruners P, Pfeffer J, Schmitz-Rode T, Mahnken AH. A fully functional prototype for establishing electrochemotherapy in interstitial usage. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
40
|
Ritter A, Karami M, Schäfer G, Baumann M. Multimodal Electronic Assessments with Active Voice Input. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
41
|
Mogensen C, Bergner B, Wallner S, Ritter A, d'Avis S, Ninichuk V, Kameritsch P, Gloe T, Nagel W, Pohl U. Isolation and functional characterization of pericytes derived from hamster skeletal muscle. Acta Physiol (Oxf) 2011; 201:413-26. [PMID: 20969729 DOI: 10.1111/j.1748-1716.2010.02206.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
AIM At the interface of tissue and capillaries, pericytes (PC) may generate electrical signals to be conducted along the skeletal muscle vascular network, but they are functionally not well characterized. We aimed to isolate and cultivate muscle PC allowing to analyse functional properties considered important for signal generation and conduction. METHODS Pericytes were enzymatically isolated from hamster thigh muscles and further selected during a 16-30 days' cultivation period. PC markers were studied by fluorescence activated cell scanning (FACS) and immunocytochemistry. Electrical properties of the cultured PC were investigated by patch clamp technique as well as the membrane potential sensitive dye DiBAC(4) (3). RESULTS The cultured cells showed typical PC morphology and were positive for NG2, alpha smooth muscle actin, PDGFR-β and the gap junction protein Cx43. Expressions of at least one single or combinations of several markers were found in 80-90% of subpopulations. A subset of the patched cells expressed channel activities consistent with a Kv1.5 channel. In vivo presence of the channels was confirmed in sections of hamster thigh muscles. Interleukin-8, a myokine known to be released from exercising muscle, increased the expression but not the activity of this channel. Pharmacologic stimulation of the channel activity by flufenamic acid induced hyperpolarization of PC alone but not of endothelial cells [human umbilical vein endothelial cells (HUVEC)] alone. However, hyperpolarization was observed in HUVEC adjacent to PC when kept in co-culture. CONCLUSION We established a culture method for PC from skeletal muscle. A first functional characterization revealed properties which potentially enable these cells to generate hyperpolarizing signals and to communicate them to endothelial cells.
Collapse
Affiliation(s)
- C Mogensen
- Walter-Brendel-Centre of Experimental Medicine, Ludwig-Maximilians-Universität München, Munich, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Kreße G, Felber H, Ritter A, Ascherl B, Vasella A. Ene reactions with α-chloronitroso compounds: Asymmetric synthesis of N-allylhydroxylamines. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19861050911] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
43
|
Bastian E, Potzinger P, Ritter A, Schuchmann HP, von Sonntag C, Weddle G. The Direct Photolysis of Tetramethylsilane in the Gas and Liquid Phases. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19800840112] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
44
|
Abstract
The present paper aims to explore issues related to men within the context of seeking help for substance abuse. The male gender role is in conflict with help-seeking behaviour and with the fundamental principles of therapy, i.e. introspection, emotional expressivity and acknowledgement of difficulties. This creates a paradox for the male seeking psychological treatment and, it will be argued, particularly for the male substance abuser. It is argued that interventions which address the gender role and challenge men's perceptions of themselves are critical variables in the outcome of therapy, i.e. enabling them to make the necessary changes in order to promote psychological well-being. An examination of the male gender role in relation to intrapsychic issues and family systems will be followed by a brief discussion of therapeutic interventions. Some of the difficulties and issues confronted by workers who work with male substance abusers will be explored.
Collapse
Affiliation(s)
- A Ritter
- Research and Training, Drug Services Victoria, 131 Wood St, Preston, Victoria, 3072, Australia
| | | |
Collapse
|
45
|
|
46
|
Schimmöller B, Schulz H, Ritter A, Reitzmann A, Kraushaar-Czarnetzki B, Baiker A, Pratsinis S. Structure of Flame-made Vanadia/Titania and Catalytic Behaviour in the Partial Oxidation of o-Xylene. CHEM-ING-TECH 2008. [DOI: 10.1002/cite.200750797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
47
|
Muñoz-Carpena R, Ritter A, Li YC. Dynamic factor analysis of groundwater quality trends in an agricultural area adjacent to Everglades National Park. J Contam Hydrol 2005; 80:49-70. [PMID: 16102872 DOI: 10.1016/j.jconhyd.2005.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2004] [Revised: 07/06/2005] [Accepted: 07/13/2005] [Indexed: 05/04/2023]
Abstract
The extensive eastern boundary of Everglades National Park (ENP) in south Florida (USA) is subject to one of the most expensive and ambitious environmental restoration projects in history. Understanding and predicting the water quality interactions between the shallow aquifer and surface water is a key component in meeting current environmental regulations and fine-tuning ENP wetland restoration while still maintaining flood protection for the adjacent developed areas. Dynamic factor analysis (DFA), a recent technique for the study of multivariate non-stationary time-series, was applied to study fluctuations in groundwater quality in the area. More than two years of hydrological and water quality time series (rainfall; water table depth; and soil, ground and surface water concentrations of N-NO3-, N-NH4+, P-PO4(3-), Total P, F-and Cl-) from a small agricultural watershed adjacent to the ENP were selected for the study. The unexplained variability required for determining the concentration of each chemical in the 16 wells was greatly reduced by including in the analysis some of the observed time series as explanatory variables (rainfall, water table depth, and soil and canal water chemical concentration). DFA results showed that groundwater concentration of three of the agrochemical species studied (N-NO3-, P-PO4(3-)and Total P) were affected by the same explanatory variables (water table depth, enriched topsoil, and occurrence of a leaching rainfall event, in order of decreasing relative importance). This indicates that leaching by rainfall is the main mechanism explaining concentration peaks in groundwater. In the case of N-NH4+, in addition to leaching, groundwater concentration is governed by lateral exchange with canals. F-and Cl- are mainly affected by periods of dilution by rainfall recharge, and by exchange with the canals. The unstructured nature of the common trends found suggests that these are related to the complex spatially and temporally varying land use patterns in the watershed. The results indicate that peak concentrations of agrochemicals in groundwater could be reduced by improving fertilization practices (by splitting and modifying timing of applications) and by operating the regional canal system to maintain the water table low, especially during the rainy periods.
Collapse
Affiliation(s)
- R Muñoz-Carpena
- Agricultural and Biological Engineering Department, University of Florida, 101 Frazier Rogers Hall, PO Box 110570 Gainesville, FL 32611-0570, USA.
| | | | | |
Collapse
|
48
|
Fry CL, Ritter A, Baldwin S, Bowen KJ, Gardiner P, Holt T, Jenkinson R, Johnston J. Paying research participants: a study of current practices in Australia. J Med Ethics 2005; 31:542-7. [PMID: 16131558 PMCID: PMC1734228 DOI: 10.1136/jme.2004.009290] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
OBJECTIVE To examine current research payment practices and to inform development of clearer guidelines for researchers and ethics committees. DESIGN Exploratory email based questionnaire study of current research participant reimbursement practices. A diverse sample of organisations and individuals were targeted. SETTING Australia. PARTICIPANTS Contacts in 84 key research organisations and select electronic listservers across Australia. A total of 100 completed questionnaires were received with representations from a variety of research areas (for example, market, alcohol and drug, medical, pharmaceutical and social research). MAIN MEASUREMENTS Open-ended and fixed alternative questions about type of research agency; type of research; type of population under study; whether payment is standard; amounts and mechanisms of payment; factors taken into account when deciding on payment practices; and whether payment policies exist. RESULTS Reimbursement practice is highly variable. Where it occurs (most commonly for drug dependent rather than health professional or general population samples) it is largely monetary and is for time and out-of-pocket expenses. Ethics committees were reported to be often involved in decision making around reimbursement. CONCLUSIONS Research subject payment practices vary in Australia. Researchers who do provide payments to research participants generally do so without written policy and procedures. Ethics committees have an important role in developing guidelines in this area. Specific guidelines are needed considering existing local policies and procedures; payment models and their application in diverse settings; case study examples of types and levels of reimbursement; applied definitions of incentive and inducement; and the rationale for diverse payment practices in different settings.
Collapse
Affiliation(s)
- C L Fry
- Turning Point Alcohol and Drug Centre Inc., 54-62 Gertrude St, Melbourne VIC 3065, Australia.
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Fortunato G, Ritter A, Fabian D. Old Masters' lead white pigments: investigations of paintings from the 16th to the 17th century using high precision lead isotope abundance ratios. Analyst 2005; 130:898-906. [PMID: 15912239 DOI: 10.1039/b418105k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
White lead (2PbCO(3).Pb(OH)(2)), a common component in 17c. artists' painting materials, was singled out to investigate the potential of lead isotope abundance ratios in the field of authentication and origin assignment. Paintings by Peter Paul Rubens, Anthony van Dyck and other Old Masters of the Northern and Southern schools were chosen for this study. An interdisciplinary approach was chosen using both analytical instrumental methods, art technological and art historical knowledge. Minute samples taken from paintings from selected art collections worldwide were investigated using mass spectrometry, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The high precision lead isotope abundance ratios were measured by multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The determination of the calcium matrix influence with respect to possible bias effects to the isotope ratios gave clear decision support, to whether a result lies within the stated combined measurement uncertainty of the result, to eliminate time-consuming matrix separations. The scatter plots of the measured isotope abundance ratios for the painting pigments from P. P. Rubens, A. van Dyck and other Flemish painters exhibit a very narrow distribution forming a cluster. The range of the measured ratio (206)Pb/(204)Pb amounts to 0.55% and for the ratio (207)Pb/(204)Pb to 0.2%. The comparison of the data to cis-alpine (Italian) sample pigments from paintings from the same time period reveals a clear distinction between the two fields. With respect to the lead isotope data originating from the ores it is assumed that the pigment isotope ratio distribution can be explained by very distinct origin of raw materials. Presumably, no mixing of different lead ores from Europe took place. The comparison of the measured white lead isotope ratio values (Flemish paintings) and the data from ore samples led to the unexpected conclusion that local ores were not used for the pigment production but British or German sources.
Collapse
Affiliation(s)
- G Fortunato
- Swiss Federal Laboratories for Materials Testing and Research (EMPA), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
| | | | | |
Collapse
|
50
|
Klaus B, Ritter A, Grosse Hülsewiesche H, Beyrle B, Euler HU, Fender H, Hübner M, von Mittelstaedt G. [Study of the quality of codification of diagnoses and procedures under DRG conditions]. Gesundheitswesen 2005; 67:9-19. [PMID: 15672301 DOI: 10.1055/s-2004-813833] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
UNLABELLED A system based on Diagnosis Related Groups was introduced in Germany and is mandatory for hospitals from 2004. Hospitals, health care providers and the Medical Service of Social Security-Health Insurance (MDK) face a common effort. Proper codification of diagnoses and procedures is essential. The Medical Service in the State of Hessen, the Techniker Krankenkasse and the Burgerhospital Frankfurt am Main combined forces to assess codification under the DRG system. GOALS The partners cooperated to assess actual codification and to identify starting points for improvement. METHODS A random sample was taken from all in-patient cases (all departments) over a 6-month-period (n = 309). Codification or coding was checked according to German Coding Rules (Deutsche Kodierrichtlinien) from the complete hospital records. Different codification, or coding, was discussed between MDK and Hospital doctors. RESULTS The actual data revealed overcoding in 34 per cent of diagnoses and in 15 per cent of procedures. Undercoding was present in 9 per cent of diagnoses and in 2 per cent of procedures. The DRG grouping changed in 68 cases (22 per cent) after scrutiny by the Medical Service (MDK). The case-mix index (CMI) calculated from relative weights as coded by the hospital was 0.84. The case-mix index calculated from coding by MDK was 0.81. The CMI calculated from effective weights was 0.77 (hospital) and 0.75 (MDK). DISCUSSION Causes of faulty coding and possible remedies are presented. CONCLUSIONS Further systematic reviews are required to develop the DRG System and identify faulty trends.
Collapse
Affiliation(s)
- B Klaus
- Medizinischer Dienst der Krankenversicherung in Hessen, Oberursel.
| | | | | | | | | | | | | | | |
Collapse
|