Implanted bipolar pacemakers. Analysis of function.
D000368:Aged; D004562:Electrocardiography; D004582:Electronics, Medical; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects / Q000295:instrumentation / Q000592:standards; D011674:Pulse; D012424:Rural Population; D013575:Syncope / Q000209:etiology