title: Apparent malfunction of demand pacemaker caused by nonpropagated (concealed) ventricular extrasystoles.
mesh_terms: D000368:Aged; D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000503:physiopathology; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006329:Heart Conduction System / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008012:Lidocaine / Q000627:therapeutic use; D008297:Male; D010138:Pacemaker, Artificial; D011802:Quinidine / Q000627:therapeutic use; D013610:Tachycardia / Q000188:drug therapy
chemical_list: D008012:Lidocaine; D011802:Quinidine