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• W2085804980 endingPage "2367" @default.
• W2085804980 startingPage "2361" @default.
• W2085804980 abstract "Chronic heart failure (HF) is associated with morphologic abnormalities of cardiac mitochondria including hyperplasia, reduced organelle size and compromised structural integrity. In this study, we examined whether functional abnormalities of mitochondrial respiration are also present in myocardium of patients with advanced HF. Mitochondrial respiration was examined using a Clark electrode in an oxygraph cell containing saponin-skinned muscle bundles obtained from myocardium of failed explanted human hearts due to ischemic (ICM, n=9) or idiopathic dilated (IDC, n=9) cardiomyopathy. Myocardial specimens from five normal donor hearts served as controls (CON). Basal respiratory rate, respiratory rate after addition of the substrates glutamate and malate (VSUB), state 3 respiration (after addition of ADP, VADP) and respiration after the addition of atractyloside (VAT) were measured in scar-free muscle bundles obtained from the subendocardial (ENDO) and subepicardial (EPI) thirds of the left ventricular (LV) free wall, interventricular septum and right ventricular (RV) free wall. There were no differences in basal and substrate-supported respiration between CON and HF regardless of etiology. VADPwas significantly depressed both in ICM and IDC compared to CON in all the regions studied. The respiratory control ratio, VADP/VAT, was also significantly decreased in HF compared to CON. In both ICM and IDC, VADPwas significantly lower in ENDO compared to EPI. The results indicate that mitochondrial respiration is abnormal in the failing human heart. The findings support the concept of low myocardial energy production in HF via oxidative phosphorylation, an abnormality with a potentially impact on global cardiac performance." @default.
• W2085804980 created "2016-06-24" @default.
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• W2085804980 date "2000-12-01" @default.
• W2085804980 modified "2023-09-25" @default.
• W2085804980 title "Abnormal Mitochondrial Respiration in Failed Human Myocardium" @default.
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• W2085804980 doi "https://doi.org/10.1006/jmcc.2000.1266" @default.
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