title: Auscultatory changes following ventricular extrasystoles and beta-blocking agents.
mesh_terms: D000293:Adolescent; D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D000328:Adult; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000188:drug therapy; D002648:Child; D005260:Female; D006326:Heart Auscultation; D006347:Heart Sounds; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000150:complications*
chemical_list: D000319:Adrenergic beta-Antagonists