Hypercontractile Cardiac States Simulating Hypertrophic Cardiomyopathy

hypertrophic subaortic stenosis (IHSS) has been defined as an autosomal dominant myocardial disease characterized by specific physical findings, echocardiographic features, asymmetric septal hypertrophy and disordered myocardial architecture. Echocar-diographic and scintiphotographic studies failed to reveal evidence of asymmetric septal hypertrophy in four patients with systolic anterior movement of the mitral valve and the typical auscultatory and HYPERTROPHIC CARDIOMYOPATHY (HCM) or idiopathic hypertrophic subaortic stenosis (IHSS) has been defined by certain physical findings, " 2 and characteristic hemodynamic, " 2 angiographicl'3 and pathologic abnor-malities.1 ' 2, 4-7 Echocardiography provides a valuable nonin-vasive means of recognizing HCM and, in many institutions, has replaced catheterization as a means of confirming clinical diagnoses. Major echocardiographic features o