title: Atrioventricular conduction in patients with short PR intervals and normal QRS complexes.
mesh_terms: D000328:Adult; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000187:drug effects / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011433:Propranolol / Q000627:therapeutic use; D013997:Time Factors
chemical_list: D011433:Propranolol