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Oxidative capacity in failing hearts

Departments of Medicine and Radiology and Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota 55455

Submitted 23 December 2002 ; accepted in final form 4 April 2003

Although high-energy phosphate metabolism is abnormal in failing hearts [congestive heart failure (CHF)], it is unclear whether oxidative capacity is impaired. This study used the mitochondrial uncoupling agent 2,4-dinitrophenol (DNP) to determine whether reserve oxidative capacity exists during the high workload produced by catecholamine infusion in hypertrophied and failing hearts. Left ventricular hypertrophy (LVH) was produced by ascending aortic banding in 21 swine; 9 animals developed CHF. Basal myocardial phosphocreatine (PCr)/ATP measured with ³¹P NMR spectroscopy was decreased in both LVH and CHF hearts (corresponding to an increase in free [ADP]), whereas ATP was decreased in hearts with CHF. Infusion of dobutamine and dopamine (each 20 µg · kg^–1 · min^–1 iv) caused an approximate doubling of myocardial oxygen consumption () in all groups and decreased PCr/ATP in the normal and LVH groups. During continuing catecholamine infusion, DNP (2–8 mg/kg iv) caused further increases of in normal and LVH hearts with no change in PCr/ATP. In contrast, DNP caused no increase in in the failing hearts; the associated decrease of PCr/ATP suggests that DNP decreased the mitochondrial proton gradient, thereby causing ADP to increase to maintain adequate ATP synthesis.

heart failure; left ventricular hypertrophy; mitochondria; high-energy phosphates; nuclear magnetic resonance

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