The frequent occurrence of mitral regurgitation in idiopathic hypertrophic subaortic stenosis is well established, having been demonstrated in 10 of the 25 patients of Cohen et al. 3 in whom ...

Beta-adrenergic receptor blockade has been demonstrated to reduce obstruction of the left ventricular outflow tract in patients with idiopathic hypertrophic subaortic stenosis (IHSS) and has also ...