title: Intermittent P- and T-wave sensing in demand pacemakers.
mesh_terms: D001919:Bradycardia / Q000209:etiology; D004070:Digitalis / Q000494:pharmacology; D004558:Electric Stimulation; D004562:Electrocardiography; D004566:Electrodes; D006329:Heart Conduction System / Q000187:drug effects; D006339:Heart Rate; D006352:Heart Ventricles; D010138:Pacemaker, Artificial / Q000009:adverse effects; D010946:Plants, Medicinal; D010947:Plants, Toxic