Historical development of cardiac pacemakers.
D001145:Arrhythmias, Cardiac / Q000628:therapy; D002302:Cardiac Output; D004554:Electric Countershock / Q000266:history; D006323:Heart Arrest / Q000628:therapy; D049673:History, 20th Century; D010138:Pacemaker, Artificial / Q000266:history*; D014481:United States; D014693:Ventricular Fibrillation / Q000628:therapy