Clinical features of the systolic anterior motion of the mitral valve among patients without hypertrophic cardiomyopathy.

Background: The prevalence and clinical features of the systolic anterior motion of the mitral valve (SAM) without hypertrophic cardiomyopathy (HCM) have not been studied well.

Methods: Records of 9180 sequential patients who underwent echocardiography at Tokyo Women's Medical University Hospital were reviewed. SAM patients were divided into those with HCM (HCM; n=60, 68%) and those without HCM (non-HCM; n=28, 32%).