CTICasesHypertrophic Cardiomyopathy with Systolic Anterior Motion (SAM) of the Mitral Valve
Imaging findings
Cardiac MRI demonstrates hypertrophic cardiomyopathy, specifically with systolic anterior motion (SAM) of the mitral valve's anterior leaflet during systole. This is due to the Venturi effect pulling the leaflet into the left ventricular outflow tract, causing outflow obstruction and mitral regurgitation (seen as a jet). The study also shows a classic delayed enhancement pattern in the myocardium.
Key takeaways
Systolic anterior motion (SAM) of the mitral valve is a key feature of hypertrophic cardiomyopathy with outflow obstruction, caused by the Venturi effect. Cardiac MRI is excellent for visualizing this dynamic process, associated mitral regurgitation, and the characteristic myocardial delayed enhancement.
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