title: Cardiac functions during electrical stimulation of the heart. Effect of exercise and drugs in patients with permanent pacemakers.
mesh_terms: D004562:Electrocardiography; D005080:Exercise Test; D006331:Heart Diseases / Q000628:therapy*; D006334:Heart Function Tests; D006801:Humans; D005996:Nitroglycerin / Q000494:pharmacology*; D010042:Ouabain / Q000494:pharmacology*; D010138:Pacemaker, Artificial
chemical_list: D010042:Ouabain; D005996:Nitroglycerin