title: Hereditary prolongation of QT interval.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use; D000328:Adult; D001145:Arrhythmias, Cardiac / Q000235:genetics*; D001794:Blood Pressure; D002037:Bundle-Branch Block / Q000188:drug therapy; D002648:Child; D002940:Circadian Rhythm; D004562:Electrocardiography; D004644:Emotions; D006801:Humans; D008297:Male; D010375:Pedigree; D010701:Phonocardiography; D005082:Physical Exertion; D011433:Propranolol / Q000627:therapeutic use; D011674:Pulse; D013575:Syncope / Q000235:genetics; D013610:Tachycardia / Q000175:diagnosis / Q000188:drug therapy; D013637:Tape Recording; D014693:Ventricular Fibrillation / Q000175:diagnosis / Q000188:drug therapy
chemical_list: D000319:Adrenergic beta-Antagonists; D011433:Propranolol