Current problems with demand pacemakers.
D000200:Action Potentials; D001674:Bioelectric Energy Sources; D004562:Electrocardiography; D055590:Electromagnetic Phenomena; D006801:Humans; D008280:Magnetics; D008991:Monitoring, Physiologic; D009132:Muscles / Q000502:physiology; D010138:Pacemaker, Artificial / Q000009:adverse effects / Q000592:standards*