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- W2096772012 abstract "Altered cardiac metabolism and function (diabetic cardiomyopathy) has been observed in diabetes. We hypothesize that cardiac efficiency, the ratio of cardiac work (pressure-volume area [PVA]) and myocardial oxygen consumption (MVo2), is reduced in diabetic hearts. Experiments used ex vivo working hearts from control db/+, db/db (type 2 diabetes), and db/+ mice given streptozotocin (STZ; type 1 diabetes). PVA and ventricular function were assessed with a 1.4-F pressure-volume catheter at low (0.3 mmol/l) and high (1.4 mmol/l) fatty acid concentrations with simultaneous measurements of MVo2. Substrate oxidation and mitochondrial respiration were measured in separate experiments. Diabetic hearts showed decreased cardiac efficiency, revealed as an 86 and 57% increase in unloaded MVo2 in db/db and STZ-administered hearts, respectively. The slope of the PVA-MVo2 regression line was increased for db/db hearts after elevation of fatty acids, suggesting that contractile inefficiency could also contribute to the overall reduction in cardiac efficiency. The end-diastolic and end-systolic pressure-volume relationships in db/db hearts were shifted to the left with elevated end-diastolic pressure, suggesting left ventricular remodeling and/or myocardial stiffness. Thus, by means of pressure-volume technology, we have for the first time documented decreased cardiac efficiency in diabetic hearts caused by oxygen waste for noncontractile purposes." @default.
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- W2096772012 date "2006-02-01" @default.
- W2096772012 modified "2023-10-11" @default.
- W2096772012 title "Increased Myocardial Oxygen Consumption Reduces Cardiac Efficiency in Diabetic Mice" @default.
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- W2096772012 doi "https://doi.org/10.2337/diabetes.55.02.06.db05-1164" @default.
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