Myocardial Oxygen Consumption and Efficiency in Aortic Valve Stenosis Patients With and Without Heart Failure [Valvular Heart Disease]

BackgroundMyocardial oxygen consumption (MVO2) and its coupling to contractile work are fundamentals of cardiac function and may be involved causally in the transition from compensated left ventricular hypertrophy to failure. Nevertheless, these processes have not been studied previously in patients with aortic valve stenosis (AS).Methods and ResultsParticipants underwent 11C‐acetate positron emission tomography, cardiovascular magnetic resonance, and echocardiography to measure MVO2 and myocardial external efficiency (MEE) defined as the ratio of left ventricular stroke work and the energy equivalent of MVO2. We studied 10 healthy controls (group A), 37 asymptomatic AS patients with left ventricular ejection fraction ≥50% (group B), 12 symptomatic AS patients with left ventricular ejection fraction ≥50% (group C), and 9 symptomatic AS patients with left ventricular ejection fraction

Source: JAHA:Journal of the American Heart Association - February 6, 2017 Category: Cardiology Authors: Hansson, N. H. S., Sorensen, J., Harms, H. J., Kim, W. Y., Nielsen, R., Tolbod, L. P., Frokiar, J., Bouchelouche, K., Dodt, K. K., Sihm, I., Poulsen, S. H., Wiggers, H. Tags: Metabolism, Heart Failure, Valvular Heart Disease, Imaging, Nuclear Cardiology and PET Original Research Source Type: research