Double-blind trial of propranolol and practolol in hypertrophic cardiomyopathy.

Propranolol (320 mglday), practolol (800 mglday), and placebo were each administered for 4 weeks in a double-blind manner to i6 patients with hypertrophic cardiomyopathy. Symptoms were assessed using a diary card and a scoring method. Clinical examination and non-invasive tests (phonocardiography and apex cardiography) were also performed.