title: Atrial demand and AV sequential pacemakers.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000628:therapy*; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004558:Electric Stimulation; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology; D006801:Humans; D010138:Pacemaker, Artificial