Clinical Features of Idiopathic Hypertrophrc Cardiomyopathy

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Twenty-six patients with idiopathic cardiomyopathy of hypertrophic type were divided angiographically into three types. Fifteen patients (57.7 per cent) showed obvious obstruction in the outflow tract of the left ventricle (type I). Seven subjects (26.9 per cent) should prominent hypertrophy in the lower septum without distinct obstruction (type II) and 4 patients (15.4 per cent) had diffuse hypertrophy with slight dilation (type III). Type I and type II were proved to have familial form with high incidence of 54.5 per cent and 83.3 per cent respectively. Those two types were found to be identical etiologically in view of our results. Because of absence of obstruction, type II did not demonstrated such specific hemodynamics as in type I. In type III, etiological discrepancy with the former two types was suggested.
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