What are the echocardiographic mechanisms underlying functional atrial mitral regurgitation in persistent atrial fibrillation?
Functional atrial mitral regurgitation in persistent atrial fibrillation is multifactorial, involving mitral annulus dilatation, contractile dysfunction, loss of saddle shape, and posterior mitral leaflet tethering.
Functional atrial MR in persistent AF is caused by not only MA dilatation, but also by multiple factors including the MA contractile dysfunction, disruption of the annular saddle shape, and atriogenic PML tethering. (Circ J 2016; 80: 2240-2248).
Machino‐Ohtsuka et al. (Fri,) studied this question.