Cardiac pacemakers.
D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000628:therapy; D004562:Electrocardiography; D006321:Heart / Q000502:physiology; D006327:Heart Block / Q000503:physiopathology / Q000628:therapy; D006801:Humans; D008722:Methods; D010138:Pacemaker, Artificial / Q000009:adverse effects; D013614:Tachycardia, Paroxysmal / Q000628:therapy; D014693:Ventricular Fibrillation / Q000628:therapy; D014927:Wolff-Parkinson-White Syndrome / Q000628:therapy