Systolic anterior motion of mitral valve following resection of subaortic membrane and intracardiac repair of tetralogy of fallot

Abstract

Systolic anterior motion (SAM) of the mitral valve is commonly observed in patients with hypertrophic obstructive cardiomyopathy and in few patients after mitral valve repair or aortic valve replacement. It may cause significant hemodynamic instability due to left ventricular outflow tract (LVOT) obstruction and resulting mitral regurgitation. Subaortic septal bulge is considered as a one of the risk factor for the development of SAM as it narrows the LVOT. We report a case of tetralogy of fallot with subaortic septal bulge who developed SAM of the anterior mitral leaflet, intraoperatively, after resection of a subaortic membrane.

Subaortic Membrane Mimicking Hypertrophic Cardiomyopathy in the Setting of Mitral Valve Infective Endocarditis

“…Systolic anterior motion (SAM) of the mitral valve used to be considered a highly specific feature of HOCM. However, throughout recent years, SAM of the mitral valve has been associated with other structural cardiac abnormalities including SAoM [4][5][6].…”