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Puthettu M, Vandenberghe S, Balafas S, Di Serio C, Singjeli G, Pagnamenta A, Demertzis S. Optimizing CO2 field flooding during sternotomy: In vitro confirmation of the Karolinska studies. PLoS One 2024; 19:e0292669. [PMID: 38194426 PMCID: PMC10775975 DOI: 10.1371/journal.pone.0292669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 09/26/2023] [Indexed: 01/11/2024] Open
Abstract
Although CO2 field-flooding was first used during cardiac surgery more than 60 years ago, its efficacy is still disputed. The invisible nature of the gas and the difficulty in determining the "safe" quantity to protect the patient are two of the main obstacles to overcome for its validation. Moreover, CO2 concentration in the chest cavity is highly sensitive to procedural aspects, such suction and hand movements. Based on our review of the existing literature, we identified four major factors that influence the intra-cavity CO2 concentration during open-heart surgery: type of delivery device (diffuser), delivery CO2 flow rate, diffuser position around the wound cavity, and its orientation inside the cavity. In this initial study, only steady state conditions were considered to establish a basic understanding on the effect of the four above-mentioned factors. Transient factors, such as suction or hand movements, will be reported separately.
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Affiliation(s)
- Mira Puthettu
- Department of Cardiac Surgery, Istituto Cardiocentro Ticino, Lugano, Switzerland
- Laboratory of Cardiovascular Engineering, Laboratories for Translational Research EOC (LRT-EOC), Bellinzona, Switzerland
| | - Stijn Vandenberghe
- Department of Cardiac Surgery, Istituto Cardiocentro Ticino, Lugano, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
| | - Spyros Balafas
- University Centre for Statistics in the Biomedical Sciences, Vita-Salute San Raffaele University, Milano, Italy
| | - Clelia Di Serio
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
- University Centre for Statistics in the Biomedical Sciences, Vita-Salute San Raffaele University, Milano, Italy
- Clinical Trial Unit (CTU), Ente Ospedaliero Cantonale (EOC), Lugano, Switzerland
| | - Geni Singjeli
- Department of Cardiac Surgery, Istituto Cardiocentro Ticino, Lugano, Switzerland
| | - Alberto Pagnamenta
- Clinical Trial Unit (CTU), Ente Ospedaliero Cantonale (EOC), Lugano, Switzerland
- Department of Intensive Care, Ente Ospedaliero Cantonale (EOC), Lugano, Switzerland
- Division of Pneumology, University of Geneva, Geneva, Switzerland
| | - Stefanos Demertzis
- Department of Cardiac Surgery, Istituto Cardiocentro Ticino, Lugano, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
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2
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Roopnarinesingh R, Leppert M, Mukherjee D. Evidence and Mechanisms for Embolic Stroke in Contralateral Hemispheres From Carotid Artery Sources. J Am Heart Assoc 2023; 12:e030792. [PMID: 38014680 PMCID: PMC10727331 DOI: 10.1161/jaha.123.030792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 08/23/2023] [Indexed: 11/29/2023]
Abstract
BACKGROUND Disambiguation of embolus pathogenesis in embolic strokes is often a clinical challenge. One common source of embolic stroke is the carotid arteries, with emboli originating due to plaque buildup or perioperatively during revascularization procedures. Although it is commonly thought that thromboemboli from carotid sources travel to cerebral arteries ipsilaterally, there are existing reports of contralateral embolic events that complicate embolus source destination relationship for carotid sources. Here, we hypothesize that emboli from carotid sources can travel to contralateral hemispheres and that embolus interactions with collateral hemodynamics in the circle of Willis influence this process. METHODS AND RESULTS We use a patient-specific computational embolus-hemodynamics interaction model developed in prior works to conduct an in silico experiment spanning 4 patient vascular models, 6 circle of Willis anastomosis variants, and 3 different thromboembolus sizes released from left and right carotid artery sites. This led to a total of 144 different experiments, estimating trajectories and distribution of approximately 1.728 million embolus samples. Across all cases considered, emboli from left and right carotid sources showed nonzero contralateral transport (P value <-0.05). Contralateral movement revealed a size dependence, with smaller emboli traveling more contralaterally. Detailed analysis of embolus dynamics revealed that collateral flow routes in the circle of Willis played a role in routing emboli, and transhemispheric movement occurred through the anterior and posterior communicating arteries in the circle of Willis. CONCLUSIONS We generated quantitative data demonstrating the complex dynamics of finite size thromboembolus particles as they interact with pulsatile arterial hemodynamics and traverse the vascular network of the circle of Willis. This leads to a nonintuitive source-destination relationship for emboli originating from carotid artery sites, and emboli from carotid sources can potentially travel to cerebral arteries on contralateral hemispheres.
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Affiliation(s)
| | - Michelle Leppert
- Department of NeurologyUniversity of Colorado Anschutz Medical CampusAuroraCO
| | - Debanjan Mukherjee
- Paul M Rady Department of Mechanical EngineeringUniversity of Colorado BoulderBolderCO
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3
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Pierik R, Scheeren TWL, Erasmus ME, van den Bergh WM. Near-infrared spectroscopy and processed electroencephalogram monitoring for predicting peri-operative stroke risk in cardiothoracic surgery: An observational cohort study. Eur J Anaesthesiol 2023; 40:425-435. [PMID: 37067999 DOI: 10.1097/eja.0000000000001836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
BACKGROUND Stroke is a feared complication after cardiothoracic surgery, with an incidence of around 2 to 3%. Anaesthesia and postoperative sedation may obscure clinical symptoms of stroke and thus delay diagnosis and timely intervention. OBJECTIVES The objective was to assess the value of intra-operative neuromonitoring and blood pressure monitoring for predicting the occurrence of peri-operative stroke within 3 days after cardiothoracic surgery. DESIGN Single-centre retrospective observational cohort study. SETTING Academic tertiary care medical centre. PATIENTS All consecutive patients with cardiothoracic surgery and intra-operative neuromonitoring admitted postoperatively to the Intensive Care Unit (ICU) between 2008 and 2017. MAIN OUTCOME MEASURES The primary endpoint was the occurrence of any stroke confirmed by brain imaging within 3 days postcardiothoracic surgery. Areas under the curve (AUC) of intra-operative mean arterial pressure (MAP), cerebral oxygen saturation (ScO2) and bispectral index (BIS) below predefined thresholds were calculated, and the association with early stroke was tested using logistic regression analyses. RESULTS A total of 2454 patients admitted to the ICU after cardiothoracic surgery had complete intra-operative data for ScO2, BIS and MAP and were included in the analysis. In 58 patients (2.4%), a stroke was confirmed. In univariate analysis, a larger AUCMAP greater than 60 mmHg [odds ratio (OR) 1.43; 95% confidence interval (CI), 1.21 to 1.68) and larger AUCBIS<25 (OR 1.51; 95% CI, 1.24 to 1.83) were associated with the occurrence of postoperative stroke while ScO2 less than 50% or greater than 20% reduction from individual baseline was not (OR 0.91; 95% CI, 0.50 to 1.67). After multivariable analysis, AUCBIS<25 (OR 1.45; 95% CI, 1.12 to 1.87) and longer duration of MAP less than 60 mmHg (OR 1.52; 95% CI, 1.02 to 2.27) remained independently associated with stroke occurrence. CONCLUSION Cumulative intra-operative BIS values below 25 and longer duration of MAP below 60 mmHg were associated with the occurrence of peri-operative stroke within 3 days after cardiothoracic surgery. Prospective studies are warranted to evaluate a causal relationship between low BIS and stroke to establish whether avoiding intra-operative BIS values below 25 might reduce the incidence of peri-operative stroke.
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Affiliation(s)
- Ramon Pierik
- From the Department of Critical Care (RP, WMvdB), Department Anaesthesiology (TWLS) and Department of Cardiac Surgery (MEE), University Medical Center Groningen, University of Groningen, the Netherlands
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4
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Chen CH, Peterson MD, Mazer CD, Hibino M, Beaudin AE, Chu MWA, Dagenais F, Teoh H, Quan A, Dickson J, Verma S, Smith EE. Acute Infarcts on Brain MRI Following Aortic Arch Repair With Circulatory Arrest: Insights From the ACE CardioLink-3 Randomized Trial. Stroke 2023; 54:67-77. [PMID: 36315249 DOI: 10.1161/strokeaha.122.041612] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND to investigate the frequency and distribution of new ischemic brain lesions detected by diffusion-weighted imaging on brain magnetic resonance imaging after aortic arch surgery. METHODS This preplanned secondary analysis of the randomized, controlled ACE (Aortic Surgery Cerebral Protection Evaluation) CardioLink-3 trial compared the safety and efficacy of innominate versus axillary artery cannulation during elective proximal aortic arch surgery. Participants underwent pre and postoperative magnetic resonance imaging. New ischemic lesions were defined as lesions visible on postoperative, but not preoperative diffusion weighted imaging. RESULTS Of the 111 trial participants, 102 had complete magnetic resonance imaging data. A total of 391 new ischemic lesions were observed on diffusion-weighted imaging in 71 (70%) patients. The average number of lesions in patients with ischemic lesion were 5.5±4.9 with comparable numbers in the right (2.9±2.0) and left (3.0±2.3) hemispheres (P=0.49). Half the new lesions were in the middle cerebral artery territory; 63% of the cohort had ischemic lesions in the anterior circulation, 49% in the posterior circulation, 42% in both, and 20% in watershed areas. A probability mask of all diffusion-weighted imaging lesions revealed that the cerebellum was commonly involved. More severe white matter hyperintensity on preoperative magnetic resonance imaging (odds ratio, 1.80 [95% CI, 1.10-2.95]; P=0.02) and lower nadir nasopharyngeal temperature during surgery (odds ratio per 1°C decrease, 1.15 [95% CI, 1.00-1.32]; P=0.05) were associated with the presentation of new ischemic lesion; older age (risk ratio per 1-year increase, 1.02 [95% CI, 1.00-1.04]; P=0.03) and lower nadir temperature (risk ratio per 1°C decrease, 1.06 [95% CI, 1.00-1.14]; P=0.06) were associated with greater number of lesions. CONCLUSIONS In patients who underwent elective proximal aortic arch surgery, new ischemic brain lesions were common, and predominantly involved the middle cerebral artery territory or cerebellum. Underlying small vessel disease, lower temperature nadir during surgery, and advanced age were risk factors for perioperative ischemic lesions. REGISTRATION URL: https://www. CLINICALTRIALS gov; Unique identifier: NCT02554032.
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Affiliation(s)
- Chih-Hao Chen
- Department of Clinical Neurosciences, University of Calgary, AB, Canada (C.-H.C., A.E.B., E.E.S.).,Department of Neurology, National Taiwan University Hospital, Taipei, Taiwan (C.-H.C.)
| | - Mark D Peterson
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, ON, Canada (M.D.P., H.T., A.Q., S.V.).,Department of Surgery, University of Toronto, ON, Canada (M.D.P., S.V.)
| | - C David Mazer
- Department of Anesthesia, St. Michael's Hospital, Toronto, ON, Canada (C.D.M., J.D.).,Departments of Anesthesiology and Pain Medicine, University of Toronto, ON, Canada (C.D.M., J.D.).,Department of Physiology, University of Toronto, ON, Canada (C.D.M.)
| | - Makoto Hibino
- Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta, GA (M.H.)
| | - Andrew E Beaudin
- Department of Clinical Neurosciences, University of Calgary, AB, Canada (C.-H.C., A.E.B., E.E.S.).,Hotchkiss Brain Institute, University of Calgary, AB, Canada (A.E.B., E.E.S.)
| | - Michael W A Chu
- Division of Cardiac Surgery, London Health Sciences Centre and the Western University, ON, Canada (M.W.A.C.)
| | - François Dagenais
- Quebec Heart and Lung Institute, Université Laval, Quebec City, QC, Canada (F.D.)
| | - Hwee Teoh
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, ON, Canada (M.D.P., H.T., A.Q., S.V.).,Division of Endocrinology and Metabolism, St. Michael's Hospital, Toronto, ON, Canada (H.T.)
| | - Adrian Quan
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, ON, Canada (M.D.P., H.T., A.Q., S.V.)
| | - Jeffrey Dickson
- Department of Anesthesia, St. Michael's Hospital, Toronto, ON, Canada (C.D.M., J.D.).,Departments of Anesthesiology and Pain Medicine, University of Toronto, ON, Canada (C.D.M., J.D.)
| | - Subodh Verma
- Division of Cardiac Surgery, St. Michael's Hospital, Toronto, ON, Canada (M.D.P., H.T., A.Q., S.V.).,Department of Surgery, University of Toronto, ON, Canada (M.D.P., S.V.).,Department of Pharmacology and Toxicology, University of Toronto, ON, Canada (S.V.)
| | - Eric E Smith
- Department of Clinical Neurosciences, University of Calgary, AB, Canada (C.-H.C., A.E.B., E.E.S.).,Hotchkiss Brain Institute, University of Calgary, AB, Canada (A.E.B., E.E.S.)
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Vandenberghe S, Singjeli G, Demertzis S. Patient tilt improves efficacy of CO 2 field-flooding in minimally invasive cardiac surgery. J Cardiothorac Surg 2022; 17:164. [PMID: 35733212 PMCID: PMC9219288 DOI: 10.1186/s13019-022-01916-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 06/12/2022] [Indexed: 11/18/2022] Open
Abstract
Objective Space limitations during minimally invasive cardiac surgery impede consistent use of CO2 field-flooding. We compared different gas delivery methods, flow rates and the effect of patient inclination. Methods A gastight model of MICS surgery with internal organs and right thoracotomy wound was created from a mannequin and equipped with a CO2 concentration sensor in the left ventricle. Maximum achievable CO2 concentration was compared for gas delivery via three commercial CO2 diffusors (CarbonMini, Temed, Andocor) and also via a trocar with side port. Gas flow rates of 1, 3, 5 and 8 L per minute were tested. The model was placed either in supine position or with 20° oblique tilt. A simplified transparent model was also created and placed in an optical test bench to evaluate the gas cloud motions via real-time visualization. Results The trocar consistently achieved higher CO2 concentrations inside the left ventricle. At 1 l/min, approximately 2.5 min were needed to fill the supine model to its maximum CO2 concentration, which was limited to a range of 48–82% in the left ventricle. At higher flow rates, filling time and concentration were significantly improved. In a tilted model, all devices and all flow rates generated on average 99% CO2 in the ventricle. Imaging revealed constant gas exchange via the main incision, with CO2 outflow via bottom and air inflow via the top of the incision. Conclusions CO2 field flooding in minimally invasive cardiac surgery is highly effective if the patient is tilted. Else a flow rate of 5 l/min is recommended to achieve the same protection. Supplementary Information The online version contains supplementary material available at 10.1186/s13019-022-01916-5.
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Affiliation(s)
- Stijn Vandenberghe
- Faculty of Biomedical Sciences, Università Della Svizzera Italiana, Via Giuseppe Buffi 13, 6900, Lugano, Switzerland. .,Department of Cardiac Surgery, Istituto Cardiocentro Ticino, EOC, Lugano, Switzerland.
| | - Geni Singjeli
- Department of Cardiac Surgery, Istituto Cardiocentro Ticino, EOC, Lugano, Switzerland
| | - Stefanos Demertzis
- Faculty of Biomedical Sciences, Università Della Svizzera Italiana, Via Giuseppe Buffi 13, 6900, Lugano, Switzerland.,Department of Cardiac Surgery, Istituto Cardiocentro Ticino, EOC, Lugano, Switzerland
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6
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Augoustides JG. Protecting the Central Nervous System During Cardiac Surgery. Perioper Med (Lond) 2022. [DOI: 10.1016/b978-0-323-56724-4.00022-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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7
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Abstract
Neurological complications after cardiac surgery and percutaneous cardiac interventions are not uncommon. These include periprocedural stroke, postoperative cognitive dysfunction after cardiac surgery, contrast-induced encephalopathy after percutaneous interventions, and seizures. In this article, we review the incidence, pathophysiology, diagnosis, and management of these complications. Improved understanding of these complications could lead to their prevention, faster detection, and facilitation of diagnostic workup and appropriate treatment.
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Affiliation(s)
| | - Jeffrey Wang
- Division of Neurology, Department of Medicine, University of Toronto, St. Michael's Hospital, Toronto, Ontario, Canada
| | - Magdy Selim
- Department of Neurology, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Massachusetts
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8
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Malone F, McCarthy E, Delassus P, Buhk JH, Fiehler J, Morris L. An in vitro assessment of atrial fibrillation flow types on cardiogenic emboli trajectory paths. Proc Inst Mech Eng H 2020; 234:1421-1431. [DOI: 10.1177/0954411920946873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Atrial fibrillation is the most significant contributor to thrombus formation within the heart and is responsible for 45% of all cardio embolic strokes, which account for approximately 15% of acute ischemic strokes cases worldwide. Atrial fibrillation can result in a reduction of normal cardiac output and cycle length of up to 30% and 40%, respectively. A total of 240 embolus analogues were released into a thin-walled, patient-specific aortic arch under normal (60 embolus analogues) and varying atrial fibrillation (180 embolus analogues) pulsatile flow conditions. Under healthy flow conditions (n = 60), the embolus analogues tended to follow the flow rate split through each outlet vessel. There was an increase in clot trajectories along the common carotid arteries under atrial fibrillation flow conditions. A shorter pulse period (0.3 s) displayed the highest percentage of clots travelling to the brain (24%), with a greater percentage of clots travelling through the left common carotid artery (17%). This study provides an experimental insight into the effect varying cardiac output and cycle length can have on the trajectory of a cardiac source blood clots travelling to the cerebral vasculature and possibly causing a stroke.
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Affiliation(s)
- Fiona Malone
- GMedTech, Department of Mechanical and Industrial Engineering, Galway-Mayo Institute of Technology, Galway, Ireland
| | - Eugene McCarthy
- GMedTech, Department of Mechanical and Industrial Engineering, Galway-Mayo Institute of Technology, Galway, Ireland
| | - Patrick Delassus
- GMedTech, Department of Mechanical and Industrial Engineering, Galway-Mayo Institute of Technology, Galway, Ireland
| | - Jan-Hendrick Buhk
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jens Fiehler
- Department of Diagnostic and Interventional Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Liam Morris
- GMedTech, Department of Mechanical and Industrial Engineering, Galway-Mayo Institute of Technology, Galway, Ireland
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Patel N, Banahan C, Janus J, Horsfield MA, Cox A, Marshall D, Colman J, Morlese J, Evans DH, Hannon C, Egan V, Garrard P, Hague JP, Chung EML. Neurological impact of emboli during adult cardiac surgery. J Neurol Sci 2020; 416:117006. [PMID: 32623144 PMCID: PMC7718579 DOI: 10.1016/j.jns.2020.117006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/05/2020] [Accepted: 06/19/2020] [Indexed: 11/29/2022]
Abstract
Objectives This study draws on advances in Doppler ultrasound bubble sizing to investigate whether high volumes of macro-bubbles entering the brain during cardiac surgery increase the risk of new cerebral microbleeds (CMBs), ischemic MR lesions, or post-operative cognitive decline (POCD). Methods Transcranial Doppler (TCD) ultrasound recordings were analysed to estimate numbers of emboli and macrobubbles (>100 μm) entering the brain during cardiac surgery. Logistic regression was used to explore the hypothesis that emboli characteristics affect the incidence of new brain injuries identified through pre- and post-operative MRI and neuropsychological testing. Results TCD, MRI, and neuropsychological test data were compared between 28 valve and 18 CABG patients. Although valve patients received over twice as many emboli per procedure [median: 1995 vs. 859, p = .004], and seven times as many macro-bubbles [median: 218 vs. 28, p = .001], high volumes of macrobubbles were not found to be significantly associated with new CMBs, new ischaemic lesions, or POCD. The odds of acquiring new CMBs increased by approximately 5% [95% CI: 1 to 10%] for every embolus detected in the first minute after the release of the aortic cross-clamp (AxC). Logistic regression models also confirmed previous findings that cardiopulmonary bypass time and valve surgery were significant predictors for new CMBs (both p = .03). Logistic regression analysis estimated an increase in the odds of acquiring new CMBs of 6% [95% CI: 1 to 12%] for every minute of bypass time over 91 mins. Conclusions This small study provides new information about the properties and numbers of bubbles entering the brain during surgery, but found no evidence to substantiate a direct link between large numbers of macrobubbles and adverse cognitive or MR outcome. Clinical Trial Registration URL - http://www.isrctn.com. Unique identifier: 66022965. Higher numbers of macrobubbles enter the brain during valve surgery compared to bypass graft surgery. Macrobubbles did not appear to be linked to new cerebral microbleeds, ischemic lesions, or cognitive decline. Emboli received following release of the aortic cross-clamp predicted new cerebral microbleeds. Other factors predicting new microbleeds included cardiopulmonary bypass duration and surgery type.
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Affiliation(s)
- Nikil Patel
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK; Leicester Biomedical Research Centre, Glenfield Hospital, Leicester LE3 9QP, UK; Department of Clinical Neurosciences, St George's, University of London, London SW17 ORE, UK
| | - Caroline Banahan
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Justyna Janus
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Mark A Horsfield
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Anthony Cox
- Department of Clinical Neurosciences, St George's, University of London, London SW17 ORE, UK
| | - David Marshall
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Jordan Colman
- Department of Clinical Neurosciences, St George's, University of London, London SW17 ORE, UK
| | - John Morlese
- University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK
| | - David H Evans
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Claire Hannon
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK
| | - Vincent Egan
- Department of Psychiatry and Applied Psychology, University of Nottingham, Nottingham NG8 1BB, UK
| | - Peter Garrard
- Department of Clinical Neurosciences, St George's, University of London, London SW17 ORE, UK
| | - James P Hague
- School of Physical Sciences, The Open University, Walton Hall, Milton Keyns, MK7 6AA, UK
| | - Emma M L Chung
- Department of Cardiovascular Sciences, University of Leicester, Leicester LE2 7LX, UK; Leicester Biomedical Research Centre, Glenfield Hospital, Leicester LE3 9QP, UK; University Hospitals of Leicester NHS Trust, Leicester LE1 5WW, UK.
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Cognitive declines after perioperative covert stroke: Recent advances and perspectives. Curr Opin Anaesthesiol 2020; 33:651-654. [PMID: 32796168 DOI: 10.1097/aco.0000000000000903] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW With the aging of the population, there are increasing number of aged patients who require surgical interventions. Perioperative covert stroke is emerging as an important health threat and social burden that could affect patients' long-term neurological outcomes. RECENT FINDINGS Recent findings of the association between perioperative covert stroke with long-term cognitive declines of surgical patients highlighted the significance of the silent cognitive function killer-perioperative covert stroke. Considering the devastating long-term consequence of the asymptomatic covert stroke, early diagnosis and prevention are turning out as crucial problems to tackle. The evolving brain imaging techniques, such as multimodel MRI sequences are not only able to detect early, small and subtle injuries of the acute ischemic lesions, but also quite advantageous in capturing the preexisting brain vascular diseases that are considered as important risk factors of covert stroke. However, effective predictive markers are still lacking to identify high risk patients for perioperative covert stroke, rendering an unmet need of investigations in this regard. SUMMARY The present review will summarize recent findings in perioperative covert stroke and highlight future perspectives of its early diagnosis and the impact of postoperative cognitive impairments.
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11
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Neurological Complications in Cardiac Surgery. CURRENT ANESTHESIOLOGY REPORTS 2019. [DOI: 10.1007/s40140-019-00344-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Cerebral microbleeds are not associated with postoperative delirium and postoperative cognitive dysfunction in older individuals. PLoS One 2019; 14:e0218411. [PMID: 31199858 PMCID: PMC6568413 DOI: 10.1371/journal.pone.0218411] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 05/31/2019] [Indexed: 11/19/2022] Open
Abstract
Background Cerebral microbleeds (CMB) occur in the context of cerebral small vessel disease. Other brain MRI markers of cerebral small vessel disease are associated with the occurrence of postoperative delirium (POD) and postoperative cognitive dysfunction (POCD), but for CMB this is unknown. We aimed to study the association between CMB and the occurrence of POD and POCD in older individuals. Methods The current study consists of 65 patients (72±5 years) from the BIOCOG study, which is a prospective, observational study of patients who underwent an elective surgery of at least 60 minutes. Patients in the current study received a preoperative cerebral MRI scan including a 3D susceptibility-weighted imaging sequence to detect CMB. The occurrence of POD was screened for twice a day until postoperative day 7 by using the DSM-5, NuDesc, CAM, and CAM-ICU. The occurrence of POCD was determined by the reliable change index model at 7 days after surgery or discharge, respectively, and 3 months after surgery. Statistical analyses consisted of logistic regression adjusted for age and gender. Results A total of 39 CMB were detected in 17 patients (26%) prior to surgery. POD occurred in 14 out of 65 patients (22%). POCD at 7 days after surgery occurred in 11 out of 54 patients (20%) and in 3 out of 40 patients at the 3 month follow-up (8%). Preoperative CMB were not associated with the occurrence of POD (OR (95%-CI): 0.28 (0.05, 1.57); p = 0.147) or POCD at 7 days after surgery (0.76 (0.16, 3.54); p = 0.727) or at 3 months follow-up (0.61 (0.03, 11.64); p = 0.740). Conclusion We did not find an association between preoperative CMB and the occurrence of POD or POCD. Trial registration clinicaltrials.gov (NCT02265263) on 23 September 2014.
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Impact of remote ischemic preconditioning preceding coronary artery bypass grafting on inducing neuroprotection. J Thorac Cardiovasc Surg 2019; 157:1466-1476.e3. [DOI: 10.1016/j.jtcvs.2018.08.116] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 08/17/2018] [Accepted: 08/29/2018] [Indexed: 11/22/2022]
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Burkauskas J, Lang P, Bunevičius A, Neverauskas J, Bučiūtė-Jankauskienė M, Mickuvienė N. Cognitive function in patients with coronary artery disease: A literature review. J Int Med Res 2018; 46:4019-4031. [PMID: 30157691 PMCID: PMC6166352 DOI: 10.1177/0300060517751452] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 12/11/2017] [Indexed: 12/16/2022] Open
Abstract
Objective Cognitive function impairment is a well-documented complication of cerebrovascular disease (CBVD). Less is known about what factors affect the deterioration of cognitive function in patients with coronary artery disease (CAD). The aim of this review is to explore recent studies investigating factors associated with cognitive function in patients with CAD. Methods Studies published from 2010 to 2016 were identified through a systematic search of MEDLINE/PubMed and were included if they addressed factors affecting cognitive function in the CAD population. Results Of the 227 publications identified, 32 were selected for the review. Five factors tentatively affecting cognitive function in patients with CAD were identified: coronary artery bypass grafting (CABG) surgery, apolipoprotein E4 (APOE4) genotype, left ventricular ejection fraction (LVEF), medication use, and various hormones and biomarkers. Conclusion New techniques in CABG surgery have proven to alleviate postoperative cognitive decline. Researchers are still debating the effects of APOE4 genotype, LVEF, and the use of cardiovascular medications on cognitive function. Thyroid hormones and biomarkers are associated with cognitive function, but the exact nature of the association is debatable. Longitudinal studies should clarify those associations. In addition, cross-sectional studies addressing other causes of cognitive decline in patients with CAD are warranted.
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Affiliation(s)
- J. Burkauskas
- Behavioral Medicine Institute, Lithuanian University of Health
Sciences, Vydūno Str. 4/J. Šliūpo Str. 7, LT-00135, Palanga, Lithuania
| | - P. Lang
- Harvard Medical School, Laboratory of Clinical &
Experimental Psychopathology, Dr. John C. Corrigan Mental Health Center,
Harvard
Medical School, 49 Hillside Street, Fall
River, MA 02720, USA
| | - A. Bunevičius
- Laboratory of Clinical Research, Neuroscience Institute,
Lithuanian University of Health Sciences, Eivenių st. 4, LT-50161, Kaunas,
Lithuania
| | - J. Neverauskas
- Behavioral Medicine Institute, Lithuanian University of Health
Sciences, Vydūno Str. 4/J. Šliūpo Str. 7, LT-00135, Palanga, Lithuania
| | - M. Bučiūtė-Jankauskienė
- Behavioral Medicine Institute, Lithuanian University of Health
Sciences, Vydūno Str. 4/J. Šliūpo Str. 7, LT-00135, Palanga, Lithuania
| | - N. Mickuvienė
- Behavioral Medicine Institute, Lithuanian University of Health
Sciences, Vydūno Str. 4/J. Šliūpo Str. 7, LT-00135, Palanga, Lithuania
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15
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The Role of Circle of Willis Anatomy Variations in Cardio-embolic Stroke: A Patient-Specific Simulation Based Study. Ann Biomed Eng 2018; 46:1128-1145. [DOI: 10.1007/s10439-018-2027-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 04/11/2018] [Indexed: 11/25/2022]
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17
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Mukherjee D, Jani ND, Selvaganesan K, Weng CL, Shadden SC. Computational Assessment of the Relation Between Embolism Source and Embolus Distribution to the Circle of Willis for Improved Understanding of Stroke Etiology. J Biomech Eng 2017; 138:2531719. [PMID: 27367268 DOI: 10.1115/1.4033986] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Indexed: 11/08/2022]
Abstract
Stroke caused by an embolism accounts for about a third of all stroke cases. Understanding the source and cause of the embolism is critical for diagnosis and long-term treatment of such stroke cases. The complex nature of the transport of an embolus within large arteries is a primary hindrance to a clear understanding of embolic stroke etiology. Recent advances in medical image-based computational hemodynamics modeling have rendered increasing utility to such techniques as a probe into the complex flow and transport phenomena in large arteries. In this work, we present a novel, patient-specific, computational framework for understanding embolic stroke etiology, by combining image-based hemodynamics with discrete particle dynamics and a sampling-based analysis. The framework allows us to explore the important question of how embolism source manifests itself in embolus distribution across the various major cerebral arteries. Our investigations illustrate prominent numerical evidence regarding (i) the size/inertia-dependent trends in embolus distribution to the brain; (ii) the relative distribution of cardiogenic versus aortogenic emboli among the anterior, middle, and posterior cerebral arteries; (iii) the left versus right brain preference in cardio-emboli and aortic-emboli transport; and (iv) the source-destination relationship for embolisms affecting the brain.
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18
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Caldas JR, Haunton VJ, Panerai RB, Hajjar LA, Robinson TG. Cerebral autoregulation in cardiopulmonary bypass surgery: a systematic review. Interact Cardiovasc Thorac Surg 2017; 26:494-503. [DOI: 10.1093/icvts/ivx357] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 10/03/2017] [Indexed: 01/06/2023] Open
Affiliation(s)
- Juliana R Caldas
- Department of Anesthesia, Heart Institute, University of São Paulo, São Paulo, Brazil
- Hospital Sao Rafael, Salvador, Bahia, Brazil
| | - Victoria J Haunton
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
| | - Ronney B Panerai
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
- NIHR Leicester Biomedical Research Centre, University of Leicester, Leicester, UK
| | - Ludhmila A Hajjar
- Department of Anesthesia, Heart Institute, University of São Paulo, São Paulo, Brazil
- Department of Cardiopneumology, Heart Institute, University of São Paulo, Brazil
| | - Thompson G Robinson
- Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
- NIHR Leicester Biomedical Research Centre, University of Leicester, Leicester, UK
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MRI Markers of Neurodegenerative and Neurovascular Changes in Relation to Postoperative Delirium and Postoperative Cognitive Decline. Am J Geriatr Psychiatry 2017; 25:1048-1061. [PMID: 28760515 DOI: 10.1016/j.jagp.2017.06.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 06/08/2017] [Accepted: 06/20/2017] [Indexed: 12/17/2022]
Abstract
Postoperative delirium (POD) and postoperative cognitive decline (POCD) are common in elderly patients. The aim of the present review was to explore the association of neurodegenerative and neurovascular changes with the occurrence of POD and POCD. Fifteen MRI studies were identified by combining multiple search terms for POD, POCD, and brain imaging. These studies described a total of 1,422 patients and were all observational in design. Neurodegenerative changes (global and regional brain volumes) did not show a consistent association with the occurrence of POD (four studies) or POCD (two studies). In contrast, neurovascular changes (white matter hyperintensities and cerebral infarcts) were more consistently associated with the occurrence of POD (seven studies) and POCD (five studies). In conclusion, neurovascular changes appear to be consistently associated with the occurrence of POD and POCD, and may identify patients at increased risk of these conditions. Larger prospective studies are needed to study the consistency of these findings and to unravel the underlying pathophysiological mechanisms.
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20
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Mack MJ, Acker MA, Gelijns AC, Overbey JR, Parides MK, Browndyke JN, Groh MA, Moskowitz AJ, Jeffries NO, Ailawadi G, Thourani VH, Moquete EG, Iribarne A, Voisine P, Perrault LP, Bowdish ME, Bilello M, Davatzikos C, Mangusan RF, Winkle RA, Smith PK, Michler RE, Miller MA, O’Sullivan KL, Taddei-Peters WC, Rose EA, Weisel RD, Furie KL, Bagiella E, Moy CS, O’Gara PT, Messé SR. Effect of Cerebral Embolic Protection Devices on CNS Infarction in Surgical Aortic Valve Replacement: A Randomized Clinical Trial. JAMA 2017; 318:536-547. [PMID: 28787505 PMCID: PMC5808875 DOI: 10.1001/jama.2017.9479] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
IMPORTANCE Stroke is a major complication of surgical aortic valve replacement (SAVR). OBJECTIVE To determine the efficacy and adverse effects of cerebral embolic protection devices in reducing ischemic central nervous system (CNS) injury during SAVR. DESIGN, SETTING, AND PARTICIPANTS A randomized clinical trial of patients with calcific aortic stenosis undergoing SAVR at 18 North American centers between March 2015 and July 2016. The end of follow-up was December 2016. INTERVENTIONS Use of 1 of 2 cerebral embolic protection devices (n = 118 for suction-based extraction and n = 133 for intra-aortic filtration device) vs a standard aortic cannula (control; n = 132) at the time of SAVR. MAIN OUTCOMES AND MEASURES The primary end point was freedom from clinical or radiographic CNS infarction at 7 days (± 3 days) after the procedure. Secondary end points included a composite of mortality, clinical ischemic stroke, and acute kidney injury within 30 days after surgery; delirium; mortality; serious adverse events; and neurocognition. RESULTS Among 383 randomized patients (mean age, 73.9 years; 38.4% women; 368 [96.1%] completed the trial), the rate of freedom from CNS infarction at 7 days was 32.0% with suction-based extraction vs 33.3% with control (between-group difference, -1.3%; 95% CI, -13.8% to 11.2%) and 25.6% with intra-aortic filtration vs 32.4% with control (between-group difference, -6.9%; 95% CI, -17.9% to 4.2%). The 30-day composite end point was not significantly different between suction-based extraction and control (21.4% vs 24.2%, respectively; between-group difference, -2.8% [95% CI, -13.5% to 7.9%]) nor between intra-aortic filtration and control (33.3% vs 23.7%; between-group difference, 9.7% [95% CI, -1.2% to 20.5%]). There were no significant differences in mortality (3.4% for suction-based extraction vs 1.7% for control; and 2.3% for intra-aortic filtration vs 1.5% for control) or clinical stroke (5.1% for suction-based extraction vs 5.8% for control; and 8.3% for intra-aortic filtration vs 6.1% for control). Delirium at postoperative day 7 was 6.3% for suction-based extraction vs 15.3% for control (between-group difference, -9.1%; 95% CI, -17.1% to -1.0%) and 8.1% for intra-aortic filtration vs 15.6% for control (between-group difference, -7.4%; 95% CI, -15.5% to 0.6%). Mortality and overall serious adverse events at 90 days were not significantly different across groups. Patients in the intra-aortic filtration group vs patients in the control group experienced significantly more acute kidney injury events (14 vs 4, respectively; P = .02) and cardiac arrhythmias (57 vs 30; P = .004). CONCLUSIONS AND RELEVANCE Among patients undergoing SAVR, cerebral embolic protection devices compared with a standard aortic cannula did not significantly reduce the risk of CNS infarction at 7 days. Potential benefits for reduction in delirium, cognition, and symptomatic stroke merit larger trials with longer follow-up. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT02389894.
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Affiliation(s)
- Michael J. Mack
- Department of Cardiothoracic Surgery, Baylor Research Institute, Baylor Scott & White Health, Plano, Texas
| | - Michael A. Acker
- Division of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania School of Medicine, Philadelphia
| | - Annetine C. Gelijns
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Jessica R. Overbey
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Michael K. Parides
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Jeffrey N. Browndyke
- Division of Geriatric Behavioral Health, Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina
| | - Mark A. Groh
- Cardiovascular and Thoracic Surgery, Mission Health and Hospitals, Asheville, North Carolina
| | - Alan J. Moskowitz
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Neal O. Jeffries
- Office of Biostatistics Research, National Heart, Lung, and Blood Institute, Bethesda, Maryland
| | - Gorav Ailawadi
- Division of Thoracic and Cardiovascular Surgery, University of Virginia School of Medicine, Charlottesville
| | - Vinod H. Thourani
- Clinical Research Unit, Division of Cardiothoracic Surgery, Emory University School of Medicine, Atlanta, Georgia
| | - Ellen G. Moquete
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Alexander Iribarne
- Cardiac Surgery, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
| | - Pierre Voisine
- Institut Universitaire de Cardiologie de Québec, Hôpital Laval, Quebec, Quebec, Canada
| | - Louis P. Perrault
- Montréal Heart Institute, University of Montréal, Montreal, Quebec, Canada
| | - Michael E. Bowdish
- Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles
| | - Michel Bilello
- Department of Radiology, University of Pennsylvania, Philadelphia
| | | | - Ralph F. Mangusan
- Cardiovascular and Thoracic Surgery, Mission Health and Hospitals, Asheville, North Carolina
| | - Rachelle A. Winkle
- Department of Cardiothoracic Surgery, Baylor Research Institute, Baylor Scott & White Health, Plano, Texas
| | - Peter K. Smith
- Division of Cardiovascular and Thoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - Robert E. Michler
- Department of Cardiothoracic Surgery, Montefiore Medical Center/Albert Einstein College of Medicine, New York, New York
| | - Marissa A. Miller
- Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, Maryland
| | - Karen L. O’Sullivan
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Wendy C. Taddei-Peters
- Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, Maryland
| | - Eric A. Rose
- Department of Cardiac Surgery, Mount Sinai Health System, New York, New York
| | - Richard D. Weisel
- Peter Munk Cardiac Centre and Division of Cardiovascular Surgery, Toronto General Hospital, University Health Network and the Division of Cardiac Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Karen L. Furie
- Department of Neurology, Rhode Island Hospital, Miriam Hospital and Bradley Hospital, Warren Alpert Medical School, Brown University, Providence, Rhode Island
| | - Emilia Bagiella
- International Center for Health Outcomes and Innovation Research, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Claudia Scala Moy
- Division of Clinical Research, National Institute of Neurological Disorders and Stroke, Bethesda, Maryland
| | - Patrick T. O’Gara
- Cardiovascular Division, Brigham and Women’s Hospital, Boston, Massachusetts
| | - Steven R. Messé
- Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia
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Patel N, Horsfield MA, Banahan C, Thomas AG, Nath M, Nath J, Ambrosi PB, Chung EML. Detection of Focal Longitudinal Changes in the Brain by Subtraction of MR Images. AJNR Am J Neuroradiol 2017; 38:923-927. [PMID: 28364006 DOI: 10.3174/ajnr.a5165] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 12/14/2016] [Indexed: 01/19/2023]
Abstract
BACKGROUND AND PURPOSE The detection of new subtle brain pathology on MR imaging is a time-consuming and error-prone task for the radiologist. This article introduces and evaluates an image-registration and subtraction method for highlighting small changes in the brain with a view to minimizing the risk of missed pathology and reducing fatigue. MATERIALS AND METHODS We present a fully automated algorithm for highlighting subtle changes between multiple serially acquired brain MR images with a novel approach to registration and MR imaging bias field correction. The method was evaluated for the detection of new lesions in 77 patients undergoing cardiac surgery, by using pairs of fluid-attenuated inversion recovery MR images acquired 1-2 weeks before the operation and 6-8 weeks postoperatively. Three radiologists reviewed the images. RESULTS On the basis of qualitative comparison of pre- and postsurgery FLAIR images, radiologists identified 37 new ischemic lesions in 22 patients. When these images were accompanied by a subtraction image, 46 new ischemic lesions were identified in 26 patients. After we accounted for interpatient and interradiologist variability using a multilevel statistical model, the likelihood of detecting a lesion was 2.59 (95% CI, 1.18-5.67) times greater when aided by the subtraction algorithm (P = .017). Radiologists also reviewed the images significantly faster (P < .001) by using the subtraction image (mean, 42 seconds; 95% CI, 29-60 seconds) than through qualitative assessment alone (mean, 66 seconds; 95% CI, 46-96 seconds). CONCLUSIONS Use of this new subtraction algorithm would result in considerable savings in the time required to review images and in improved sensitivity to subtle focal pathology.
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Affiliation(s)
- N Patel
- From the Department of Cardiovascular Sciences (N.P., M.A.H., M.N., J.N., E.M.L.C.), University of Leicester, Leicester Royal Infirmary, Leicester, UK.,Leicester National Institute of Health Research Cardiovascular Biomedical Research Unit (N.P., E.M.L.C.), Glenfield Hospital, Leicester, UK
| | - M A Horsfield
- From the Department of Cardiovascular Sciences (N.P., M.A.H., M.N., J.N., E.M.L.C.), University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - C Banahan
- Medical Physics (C.B., E.M.L.C.), University Hospitals of Leicester National Health Service Trust, Leicester, UK
| | - A G Thomas
- Departments of Radiology (A.G.T., P.B.A.)
| | - M Nath
- From the Department of Cardiovascular Sciences (N.P., M.A.H., M.N., J.N., E.M.L.C.), University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - J Nath
- From the Department of Cardiovascular Sciences (N.P., M.A.H., M.N., J.N., E.M.L.C.), University of Leicester, Leicester Royal Infirmary, Leicester, UK
| | - P B Ambrosi
- Departments of Radiology (A.G.T., P.B.A.).,Neuri Beaujon (P.B.A.), University Paris Diderot, Paris, France
| | - E M L Chung
- From the Department of Cardiovascular Sciences (N.P., M.A.H., M.N., J.N., E.M.L.C.), University of Leicester, Leicester Royal Infirmary, Leicester, UK .,Leicester National Institute of Health Research Cardiovascular Biomedical Research Unit (N.P., E.M.L.C.), Glenfield Hospital, Leicester, UK.,Medical Physics (C.B., E.M.L.C.), University Hospitals of Leicester National Health Service Trust, Leicester, UK
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22
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Browndyke JN, Berger M, Harshbarger TB, Smith PJ, White W, Bisanar TL, Alexander JH, Gaca JG, Welsh-Bohmer K, Newman MF, Mathew JP. Resting-State Functional Connectivity and Cognition After Major Cardiac Surgery in Older Adults without Preoperative Cognitive Impairment: Preliminary Findings. J Am Geriatr Soc 2016; 65:e6-e12. [PMID: 27858963 DOI: 10.1111/jgs.14534] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVES To look for changes in intrinsic functional brain connectivity associated with postoperative changes in cognition, a common complication in seniors undergoing major surgery, using resting-state functional magnetic resonance imaging. DESIGN Objective cognitive testing and functional brain imaging were prospectively performed at preoperative baseline and 6 weeks after surgery and at the same time intervals in nonsurgical controls. SETTING Academic medical center. PARTICIPANTS Older adults undergoing cardiac surgery (n = 12) and nonsurgical older adult controls with a history of coronary artery disease (n = 12); no participants had cognitive impairment at preoperative baseline (Mini-Mental State Examination score >27). MEASUREMENTS Differences in resting-state functional connectivity (RSFC) and global cognitive change relationships were assessed using a voxel-wise intrinsic connectivity method, controlling for demographic factors and pre- and perioperative cerebral white matter disease volume. Analyses were corrected for multiple comparisons (false discovery rate P < .01). RESULTS Global cognitive change after cardiac surgery was significantly associated with intrinsic RSFC changes in regions of the posterior cingulate cortex and right superior frontal gyrus-anatomical and functional locations of the brain's default mode network (DMN). No statistically significant relationships were found between global cognitive change and RSFC change in nonsurgical controls. CONCLUSION Clinicians have long known that some older adults develop postoperative cognitive dysfunction (POCD) after anesthesia and surgery, yet the neurobiological correlates of POCD are not well defined. The current results suggest that altered RSFC in specific DMN regions is positively correlated with global cognitive change 6 weeks after cardiac surgery, suggesting that DMN activity and connectivity could be important diagnostic markers of POCD or intervention targets for potential POCD treatment efforts.
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Affiliation(s)
- Jeffrey N Browndyke
- Geriatric Behavioral Health Division, Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina.,Institute for Brain Sciences, Duke University, Durham, North Carolina.,Brain Imaging and Analysis Center, Duke University, Durham, North Carolina
| | - Miles Berger
- Division of Neuroanesthesiology, Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - Todd B Harshbarger
- Brain Imaging and Analysis Center, Duke University, Durham, North Carolina.,Department of Radiology, Duke University Medical Center, Durham, North Carolina
| | - Patrick J Smith
- Behavioral Medicine Division, Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina
| | - William White
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - Tiffany L Bisanar
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - John H Alexander
- Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, North Carolina
| | - Jeffrey G Gaca
- Division of Cardiothoracic Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - Kathleen Welsh-Bohmer
- Geriatric Behavioral Health Division, Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina
| | - Mark F Newman
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - Joseph P Mathew
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
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23
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Mokin M, Zivadinov R, Dwyer MG, Lazar RM, Hopkins LN, Siddiqui AH. Transcatheter aortic valve replacement: perioperative stroke and beyond. Expert Rev Neurother 2016; 17:327-334. [PMID: 27786568 DOI: 10.1080/14737175.2017.1253475] [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] [Indexed: 01/31/2023]
Abstract
INTRODUCTION The definition of stroke has changed over time, from a clinical only-based diagnosis to a more complex classification, including both clinical and imaging-based criteria, in part due to widespread use of magnetic resonance imaging (MRI). The increasing number of transcatheter aortic valve replacement (TAVR) procedures in patients with severe aortic valvular stenosis who are considered high-risk surgical candidates has influenced our view on the diagnosis, interpretation, and significance of perioperative stroke during these procedures. Areas covered: In this perspective, we summarize changes in the definition and diagnostic criteria for stroke and transient ischemic attacks. We examine how the introduction of MRI and standardized cognitive tests has affected our understanding of the safety of TAVR procedures. Finally, we review the growing evidence regarding the role of cerebral protection technology during TAVR procedures on cognitive function. Expert commentary: Standardized MRI-based protocols and prospective evaluation of neurologic deficits with a battery of cognitive assessment tests are needed to ensure accurate recognition of postprocedural clinical events in patients undergoing TAVR procedures and to confirm the effectiveness of embolic protection technology.
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Affiliation(s)
- Maxim Mokin
- a Departments of Neurology and Neurosurgery , University of South Florida College of Medicine , Tampa , FL , USA
| | - Robert Zivadinov
- b Buffalo Neuroimaging Analysis Center and The Jacobs Neurological Institute, Department of Neurology, Jacobs School of Medicine and Biomedical Sciences , University at Buffalo, State University of New York, Buffalo General Medical Center , Buffalo , NY , USA
| | - Michael G Dwyer
- b Buffalo Neuroimaging Analysis Center and The Jacobs Neurological Institute, Department of Neurology, Jacobs School of Medicine and Biomedical Sciences , University at Buffalo, State University of New York, Buffalo General Medical Center , Buffalo , NY , USA
| | - Ronald M Lazar
- c Departments of Neurology and Neurological Surgery , Columbia University Medical Center , New York , NY , USA
| | - L Nelson Hopkins
- d Departments of Neurosurgery and Radiology, Jacobs School of Medicine and Biomedical Sciences , University at Buffalo, State University of New York , Buffalo , NY , USA.,e Department of Neurosurgery , Gates Vascular Institute at Kaleida Health , Buffalo , NY , USA.,f Toshiba Stroke and Vascular Research Center , University at Buffalo, State University of New York , Buffalo , NY , USA.,g Jacobs Institute , Buffalo , NY , USA
| | - Adnan H Siddiqui
- d Departments of Neurosurgery and Radiology, Jacobs School of Medicine and Biomedical Sciences , University at Buffalo, State University of New York , Buffalo , NY , USA.,e Department of Neurosurgery , Gates Vascular Institute at Kaleida Health , Buffalo , NY , USA.,f Toshiba Stroke and Vascular Research Center , University at Buffalo, State University of New York , Buffalo , NY , USA.,g Jacobs Institute , Buffalo , NY , USA
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24
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Patel N, Minhas JS, Chung EML. Intraoperative Embolization and Cognitive Decline After Cardiac Surgery. Semin Cardiothorac Vasc Anesth 2016; 20:225-31. [DOI: 10.1177/1089253215626728] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Since the advent of cardiac surgery, complications have existed in many forms. Recent work has focused on the safety of current cardiac surgery with particular emphasis on cognitive outcomes. Cardiopulmonary bypass has improved the safety of operative practice; however, increasing concern surrounds the measurable and immeasurable impact embolization has on the brain. New ischemic lesions have been associated with distant emboli, which intraoperatively enter the cardiovascular system. This has prompted better characterization of the nature of emboli manifesting as cognitive impairment postoperatively. The difficulty in attributing causation relates to the subclinical damage that does not necessarily manifest as clinical stroke. Transcranial Doppler has become an important tool in documenting cerebral emboli during surgery. The purpose of this systematic review is to focus on the current literature to improve our understanding of the impact embolization has on the brain. We also aim to investigate which cardiac interventions hold the greatest burden of embolic load and how previous literature has investigated the impact of emboli on cognition by monitoring emboli during specific cardiac interventions. Significant intraoperative factors such as the cardiopulmonary bypass machine and surgical interventions have been highlighted to summarize the current literature associating cerebral embolization with these factors and postoperative cognitive outcomes. The findings of this review report that the current literature is divided as to whether the impact of embolization during cardiac surgery has any adverse impact on cognition. This review highlights that the ultimate goal of improving cognitive safety will involve further careful consideration of multifactorial events.
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25
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Patel N, Minhas JS, Chung EML. The Presence of New MRI Lesions and Cognitive Decline After Cardiac Surgery: A Systematic Review. J Card Surg 2015; 30:808-12. [PMID: 26395750 DOI: 10.1111/jocs.12643] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Patients are commonly reported to experience postoperative cognitive decline (POCD) and new ischemic lesions following surgery, which many researchers have hypothesised to result from emboli entering the cerebral circulation during surgery. Modern magnetic resonance imaging techniques have enabled clear and accurate identification of ischemic lesions. However, difficulties in assessing subtle changes in cognitive impairment clinically remain. The purpose of this systematic review is to discuss the literature that has investigated cognitive outcome in relation to new ischaemic brain lesions after cardiac surgery.
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Affiliation(s)
- Nikil Patel
- Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom.,Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, United Kingdom
| | - Jatinder S Minhas
- Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom.,University Hospitals of Leicester NHS Trust, Leicester, United Kingdom
| | - Emma M L Chung
- Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom.,Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital, Leicester, United Kingdom.,Department of Medical Physics, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom
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