The mechanism of the intraventricular pressure gradient in idiopathic hypertrophic subaortic stenosis.
D000792:Angiography; D006328:Cardiac Catheterization; D002312:Cardiomyopathy, Hypertrophic / Q000503:physiopathology*; D006439:Hemodynamics; D006801:Humans; D014636:Valsalva Maneuver