Myocardial myosin from patients with mitral regurgitation heart failure showed no significant difference in maximal actomyosin ATPase activity or in vitro motility compared to normal controls (P > .05).
Observational
p-value: p=> .05
Myofibrillar but not actomyosin ATPase is depressed in failing myocardium from patients with dilated cardiomyopathy. Since there is a similar depression of myofibrillar ATPase in mitral regurgitation myocardium, we investigated whether or not the hydrolytic and mechanical performances of myosin are altered by comparing the maximal actomyosin ATPase activity and the in vitro myosin motility of myocardial myosin from patients with mitral regurgitation heart failure with that of patients with normal ventricular function. The results show that there is no significant difference (P > .05) between nonfailing and failing values for either the maximal actomyosin ATPase activity (0.3 s-1.head-1) or the myosin motility (1 micron/s). These observations suggest that changes, other than in the myosin heavy chain, contribute to the altered myocardial performance in mitral regurgitation myocardium.
Nguyen et al. (Thu,) conducted a observational in Mitral regurgitation heart failure. Myocardial myosin from patients with mitral regurgitation heart failure vs. Myocardial myosin from patients with normal ventricular function was evaluated on Maximal actomyosin ATPase activity and in vitro myosin motility (p=> .05). Myocardial myosin from patients with mitral regurgitation heart failure showed no significant difference in maximal actomyosin ATPase activity or in vitro motility compared to normal controls (P > .05).