Document Detail

How to discriminate between hibernating and stunned myocardium.
MedLine Citation:
PMID:  16760869     Owner:  NLM     Status:  MEDLINE    
AIM: The aim of the present study was to examine if it is possible to discriminate between hibernating and stunned myocardium in vivo by determining the ratio between diastolic and systolic coronary arterial inflow and by measuring oxygen saturation in draining coronary venous blood. METHODS: Experiments were performed in 32 open chest pigs anesthetized with sodium pentobarbital. In 11 pigs hibernation was induced in a part of the left ventricular myocardium by reducing flow in the mid-left anterior descending coronary artery (LAD) to about 60% of baseline flow. In 12 pigs stunning was induced by occluding mid-LAD twice for 10 min with a 30 min interval. In 9 pigs (control group) coronary flow was not manipulated. RESULTS: We found, at comparable degrees of regional dysfunction, that the ratio between diastolic and systolic flow in stunned myocardium remained unaltered, but fell from about 2 to 1 in hibernating myocardium. Furthermore, coronary venous oxygen saturation decreased from about 30% to 17% in blood draining hibernating myocardium, but remained statistically unaltered in blood draining stunned myocardium. CONCLUSION: We conclude that it is possible to discriminate between hibernating and stunned myocardium by measuring phasic coronary arterial blood flow and oxygen saturation in blood draining the region in question. During hibernation only, the diastolic flow component of coronary arterial inflow is reduced and the coronary venous oxygen extraction increased.
F Grund; C Treiman; A Ilebekk
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of cardiovascular surgery     Volume:  47     ISSN:  0021-9509     ISO Abbreviation:  J Cardiovasc Surg (Torino)     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-06-08     Completed Date:  2006-09-01     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0066127     Medline TA:  J Cardiovasc Surg (Torino)     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  323-8     Citation Subset:  IM    
Institute for Experimental Medical Research, Ullevål University Hospital, Oslo, Norway.
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MeSH Terms
Analysis of Variance
Blood Pressure
Coronary Circulation
Disease Models, Animal
Heart Rate
Myocardial Contraction
Myocardial Stunning / pathology*,  physiopathology*
Oxygen Consumption
Stroke Volume

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