Myocardial Contraction Fraction for Risk Stratification in Low-Gradient Aortic Stenosis With Preserved Ejection Fraction.

BACKGROUND: myocardial contraction fraction (mcf) is a volumetric measure of myocardial shortening independent of left ventricular size and geometry. This multicenter study investigates the usefulness of mcf for risk stratification in low-gradient severe aortic stenosis with preserved ejection fraction. METHODS: We included 643 consecutive patients with low-gradient severe aortic stenosis with preserved ejection fraction in whom MCF was computed at baseline and analyzed mortality during follow-up. RESULTS: Throughout follow-up with medical and surgical management (34.9 [16.1-65.3] months), low... Mehr ...