Systolic anterior motion of the mitral valve in non-hypertrophic cardiomyopathy

Systolic anterior motion (SAM) of the mitral valve refers to movement of the anterior mitral valve toward the interventricular septum during systole, which can cause mitral regurgitation and severe left ventricular outflow tract obstruction. SAM is usually seen in hypertrophic cardiomyopathy, Besides, it can also occur in patients after mitral valve repair, acute myocardial infarction, Takotsubo syndrome, and aortic valve replacement et. It is essential to understanding clinical settings and mechanism of SAM so that we can recognize and treat it as soon as possible. Key words: Mitral valve; Systolic anterior motion; Ventricular outflow obstruction; Mitral valve insufficiency