Definition and Prognosis of Mitral Regurgitation in Transthyretin Amyloid Cardiomyopathy: A Multicenter International Cohort Study.
BACKGROUND In transthyretin amyloid cardiomyopathy, mitral regurgitation (MR) severity may be underestimated by conventional (semi-)quantitative echocardiographic criteria due to restrictive low-flow hemodynamics. We sought to define and validate disease-specific MR risk thresholds and compare their prognostic performa...