Document Detail

Tolerance of the hypertrophic heart to ischemia. Studies in compensated and failing dog hearts with pressure overload hypertrophy.
MedLine Citation:
PMID:  2139593     Owner:  NLM     Status:  MEDLINE    
Tolerance of the canine heart to prolonged ischemic arrest was studied in 10 hearts from normal control dogs and 15 hearts from dogs with left ventricular hypertrophy (LVH); experiments were performed 1 year after banding the aorta in 8-week-old puppies. At 1 year, hemodynamic studies revealed decreased left ventricular (LV) fiber shortening and elevated end-diastolic pressure (EDP) in five dogs (group with LVH failure); 10 dogs exhibited normal shortening and normal EDP (group with LVH compensation). The left ventricle-to-body weight ratio (g/kg) was 4.4 +/- 0.8 in the control group of dogs, 7.7 +/- 1.0 in the group with LVH compensation, and 10 +/- 2.5 in the group with LVH failure. The tolerance to 60 minutes of global ischemia (37 degrees C) followed by 90 minutes of reperfusion was studied in an isolated blood-perfused heart apparatus (isovolumic left ventricle, coronary perfusion pressure of 100 mm Hg). In the baseline (preischemic) state, coronary blood flow, myocardial oxygen consumption, lactate extraction, and myocardial high-energy phosphate content were essentially equal in the three groups; with LV volume adjusted to produce a systolic pressure of 100 mm Hg, there were no significant differences in LVEDP among the three groups. During ischemia, the diastolic (asystolic) pressure increased from 11 +/- 3 to 28 +/- 16 mm Hg (p less than 0.05) in the group with LVH failure; however, it did not increase in the control or the LVH compensation groups. Myocardial ATP levels declined equally in all three groups. During early reperfusion, lactate washout was lowest in the group with LVH failure. By 90 minutes of reperfusion, there were no significant differences in coronary blood flow, myocardial oxygen consumption, lactate extraction, or high-energy phosphate levels. High diastolic pressure persisted at 90 minutes of reperfusion in the LVH failure group (EDP was 34 +/- 19 mm Hg); however, there was no significant change in EDP during reperfusion in the control or with LVH compensation groups. After 90 minutes of reperfusion, developed pressures in the control (54 +/- 9 mm Hg), the LVH compensation (49 +/- 18 mm Hg), and the LVH failure (67 +/- 17 mm Hg) groups were not significantly different. These data indicate that hearts with compensated LVH do not exhibit an impaired tolerance to ischemia.(ABSTRACT TRUNCATED AT 400 WORDS)
W H Gaasch; M R Zile; P K Hoshino; E O Weinberg; D R Rhodes; C S Apstein
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  81     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1990 May 
Date Detail:
Created Date:  1990-06-01     Completed Date:  1990-06-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1644-53     Citation Subset:  AIM; IM    
Department of Medicine, Medical Center of Central Massachusetts, Boston.
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MeSH Terms
Adenosine Triphosphate / metabolism
Cardiomegaly / physiopathology*
Coronary Circulation / physiology*
Heart Arrest, Induced*
Heart Ventricles / physiopathology
Lactates / metabolism
Lactic Acid
Myocardial Reperfusion Injury / metabolism,  physiopathology
Myocardium / metabolism
Oxygen Consumption
Phosphocreatine / metabolism
Grant Support
Reg. No./Substance:
0/Lactates; 50-21-5/Lactic Acid; 56-65-5/Adenosine Triphosphate; 67-07-2/Phosphocreatine

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