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Hypertrophic cardiomyopathy was first recognized as a disease of obstruction to left ventricular outflow, hence, its early names and acronyms such as idiopathic hypertrophic subaortic obstruction. The nonobstructive subset of patients, incapable of developing mechanical impedance to left ventricular outflow at rest or with physiologic exercise, was initially recognized by the Braunwald group at the...
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