Systolic Anterior Motion of the Mitral Valve Post-Heart Transplant Secondary to an Unusual Mechanism.

In this case report, we discuss the critical interdependence of structure and function in demonstrating systolic anterior motion (SAM) of the mitral valve after repeat heart transplantation, where residual apical tissue of the explanted heart remained in place. The resulting conformational changes led to anterior displacement of the mitral valve and persistent SAM.

Sub-aortic membrane - A three-dimensional echocardiographic perspective.

Introduction: Subaortic membrane is an uncommon cause of left ventricular outflow tract obstruction.

Discussion: Whereas traditionally described of as a membrane, it is in fact a discreet circumferential shelf of raised endocardium in the left ventricular outflow tract, causing a fixed outflow obstruction. The circumferential nature of subaortic membranes is poorly appreciated on 2-dimensional imaging.