First described in 1907 by Schicke but recognized as a clinical entity only as recently as 1958, when Teare published the pathologic findings in patients with hypertrophic cardiomyopathy (HeM), an explosion of knowledge about this fascinating disease has occurred, which has caused a profound evolution of our understanding of its broad pathophysiologic and clinical spectrum. Progress has been particularly rapid in the past few years when M-mode echocardiography, and more recently 2-dimen sional echocardiography have been applied to the study ofHCM. In addition to new insights as to what the...