Document Detail

Ischemic preconditioning does not acutely improve load-insensitive parameters of contractility in in vivo stunned porcine myocardium.
MedLine Citation:
PMID:  10096978     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Ischemic preconditioning has been shown to have no beneficial effect on segment shortening in in vivo regionally stunned myocardium. The purpose of this study was to determine whether ischemic preconditioning improves the recovery of postischemic ventricular function when contractility is assessed by load-insensitive measurements including end-systolic pressure length relations, preload recruitable stroke work, and preload recruitable stroke work area in in vivo regionally stunned porcine myocardium. METHODS: Open chest, pentobarbital-anesthetized pigs were used. Regional ventricular function was monitored by measurements of segment shortening, stroke work, end systolic pressure length relations, preload recruitable stroke work, and preload recruitable stroke work area. The control group was submitted to 15 minutes of left anterior descending coronary artery occlusion and 3 hours of reperfusion. The preconditioned group underwent 2 cycles of 5-minute left anterior descending coronary artery occlusion and 10-minute reperfusion before 15 minutes of occlusion. RESULTS: There was no infarct in either group. The preconditioning protocol significantly depressed preischemic segment shortening but not regional stroke work. Ischemic preconditioning had no significant beneficial effect on regional stroke work, end-systolic pressure length relations, preload recruitable stroke work, or preload recruitable stroke work area. CONCLUSIONS: These results confirm that ischemic preconditioning does not ameliorate in vivo porcine myocardial stunning and indicate that ischemic preconditioning may have a limited cardioprotective role during cardiac operation.
M S Jahania; R D Lasley; R M Mentzer
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of thoracic and cardiovascular surgery     Volume:  117     ISSN:  0022-5223     ISO Abbreviation:  J. Thorac. Cardiovasc. Surg.     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-04-16     Completed Date:  1999-04-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0376343     Medline TA:  J Thorac Cardiovasc Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  810-7     Citation Subset:  AIM; IM; S    
Department of Surgery, University of Kentucky College of Medicine, Lexington, KY, USA.
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MeSH Terms
Hemodynamics / physiology
Ischemic Preconditioning, Myocardial*
Myocardial Contraction / physiology*
Myocardial Stunning / physiopathology,  therapy*
Random Allocation
Stroke Volume / physiology
Time Factors
Ventricular Function / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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