| Spatial distribution and extent of electroporation by strong internal shock in intact structurally normal and chronically infarcted rabbit hearts. | |
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MedLine Citation:
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PMID: 18479336 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Although life-saving, a strong internal defibrillation shock may temporarily or permanently damage the heart via disruption of cell membranes (electroporation). Spatial extent of electroporation in intact, normal, or infarcted hearts has not been investigated. In this study, shock-induced electroporation in intact rabbit hearts with and without chronic (>4 weeks) left ventricular myocardial infarction (MI) was characterized. METHODS AND RESULTS: A coil shock electrode was inserted in the right ventricle of Langendorff-perfused hearts. One truncated exponential monophasic shock (+300 V, 8 ms) was delivered by a 150 microF capacitor clinical defibrillator while the heart was perfused with membrane-impermeant dye propidium iodide (PI). The heart was sectioned transversely, and uptake of PI into ventricular myocardium through electropores was quantified. Histological evaluation was performed via Masson's trichrome staining. PI accumulation was minimal in the control (n = 3) and MI (n = 3) hearts without shock. Following shock delivery, (1) in control (n = 5) and MI (n = 5) hearts, electroporation mostly occurred near the shock electrode and was longitudinally distributed along the active region of the shock electrode; (2) in MI group, electroporation was significantly increased (P < 0.05) in the surviving anterior epicardial layers of the infarcted region; and (3) between the control and MI groups, the overall extent of electroporation was similar. CONCLUSION: Shock-induced electroporation was spatially dependent on the location and dimension of the active region of the shock electrode. The overall extent of electroporation in the MI heart was comparable with the control heart, but the surviving anterior epicardial layers in the infarcted region were more susceptible to electroporation. |
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Authors:
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Seok C Kim; Amit Vasanji; Igor R Efimov; Yuanna Cheng |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2008-05-09 |
Journal Detail:
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Title: Journal of cardiovascular electrophysiology Volume: 19 ISSN: 1540-8167 ISO Abbreviation: J. Cardiovasc. Electrophysiol. Publication Date: 2008 Oct |
Date Detail:
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Created Date: 2008-10-07 Completed Date: 2009-01-09 Revised Date: 2011-04-26 |
Medline Journal Info:
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Nlm Unique ID: 9010756 Medline TA: J Cardiovasc Electrophysiol Country: United States |
Other Details:
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Languages: eng Pagination: 1080-9 Citation Subset: IM |
Affiliation:
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Department of Molecular Cardiology, Cleveland Clinic, Cleveland, Ohio 44195, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cell Membrane Permeability / radiation effects* Chronic Disease Electric Countershock / methods* Electroporation / methods Female Heart Conduction System / physiopathology*, radiation effects* Male Myocardial Infarction / complications, physiopathology*, therapy* Rabbits |
| Grant Support | |
ID/Acronym/Agency:
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R01 HL074283/HL/NHLBI NIH HHS; R01 HL074283-03/HL/NHLBI NIH HHS; R01 HL074283-04/HL/NHLBI NIH HHS |
| Comments/Corrections | |
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