title: Echocardiographic measurement of the left ventricular outflow gradient in idiopathic hypertrophic subaortic stenosis.
mesh_terms: D000792:Angiography; D006328:Cardiac Catheterization; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D004452:Echocardiography; D006321:Heart / Q000187:drug effects; D006339:Heart Rate; D006346:Heart Septum / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D007545:Isoproterenol / Q000494:pharmacology; D008722:Methods; D008943:Mitral Valve / Q000503:physiopathology; D010656:Phenylephrine / Q000494:pharmacology; D014159:Transducers
chemical_list: D010656:Phenylephrine; D007545:Isoproterenol