title: Changes in myocardial threshold. Physiologic and pharmacologic factors in patients with implanted pacemakers.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001285:Atropine / Q000494:pharmacology; D004056:Differential Threshold; D004435:Eating / Q000502:physiology; D004573:Electrolytes / Q000494:pharmacology; D005260:Female; D006321:Heart / Q000187:drug effects / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D005082:Physical Exertion; D011342:Procainamide / Q000494:pharmacology; D012890:Sleep / Q000502:physiology; D013256:Steroids / Q000494:pharmacology; D013566:Sympathomimetics / Q000494:pharmacology
chemical_list: D004573:Electrolytes; D013256:Steroids; D013566:Sympathomimetics; D001285:Atropine; D011342:Procainamide