What is systolic anterior motion (SAM) of the mitral valve and how does it cause dynamic LVOT obstruction?

• A. Posterior displacement of the mitral valve leaflet toward LVOT
• B. An anterior displacement of the mitral valve leaflet toward the LVOT during systole, creating a dynamic LVOT gradient, commonly seen in hypertrophic cardiomyopathy.
• C. Diastolic displacement of aortic valve
• D. Mitral stenosis causing LVOT obstruction

Answer: (B)