Idiopathic hypertrophic subaortic stenosis. II. The shallow left ventricular cavity.

Using different volumetric methods for the estimation of the end diastolic volume in patients with idiopathic hypertrophic subaortic stenosis it is concluded that in this condition the left ventricular cavity is shallower than it appears in the 60 degrees right posterior oblique projection and that ordinary cardioangiographic volumetric methods probably overestimate the end diastolic volume because of the septal bulge.