Abstract
A 17 year old girl had typical electrocardiographic and phonocardiographic findings of idiopathic hypertrophic subaortic stenosis in 1960. Left ventricular-systemic arterial gradients of at least 95 mm Hg were verified by left heart catheterization on 3 occasions in 1960 and 1961 without pharmacological stimulation. Over the next 10 years, the murmur and abnormal cardiac catheterization findings disappeared. Catheterization in 1968 demonstrated no significant resting gradient and only a minimal gradient after administration of isoproterenol. The phonocardiogram and carotid pulse tracing were normal in 1970.
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