systolic anterior motion
Abnormal forward movement of the mitral valve during systole, potentially causing outflow obstruction.
Full Definition
Systolic anterior motion refers to the abnormal anterior displacement of the mitral valve leaflets during systolic contraction, which can result in dynamic left ventricular outflow tract obstruction. This phenomenon is commonly seen in hypertrophic cardiomyopathy but can also occur after mitral valve repair or in conditions with reduced ventricular volume. SAM can cause significant hemodynamic compromise and mitral regurgitation. Recognition and management of SAM is crucial in cardiac anesthesia, as it may require specific interventions including volume loading, beta-blockade, or surgical revision.
Usage
Usage note: Often abbreviated as SAM. Distinguish from mitral valve prolapse, which is posterior movement.
In Context
- "Post-repair TEE revealed significant systolic anterior motion with LVOT obstruction." — Intraoperative complication
- "The patient's systolic anterior motion resolved with increased preload and beta-blockade." — Medical management