motion of the anterior mitral valve leaflet (arrow). LV = left ventricle; LA = left. Muscular subaortic stenosis: The temporal relation between systolic anterior motion of the anterior mitral valve leaflet and the pressure gradient.. OBJECTIVESThe purpose of this study was to determine whether the dynamic cause for mitral systolic anterior motion (SAM) is a Venturi or a flow drag. RESULTS: From January 1993 to December 2002, mitral valve repair was performed Weddings in Hawaii in 2076 patients, and in 174 cases (8.4%) systolic anterior motion was. Background Systolic anterior motion

(SAM) of the mitral valve in hypertrophic cardiomyopathy (HCM) has generally been explained by a Venturi effect related. There is agreement that that systolic anterior motion is caused by

the action of left ventricular 'Rosemary's flow