title: Activity-mode cardiac pacing: clinical considerations.
abstract: In the past, pacemaker candidates with "chronotropic incompetence" or chronic atrial arrhythmias have been treated with fixed-rate cardiac pacing. During physical exertion, however, increased cardiac output is often limited by this fixed rate. A physiologic pacemaker that increases the cardiac pacing rate as a response to physical activity is now available. The benefits of this pacemaker are increased heart rate during physical activity and increased exercise tolerance.
mesh_terms: D002302:Cardiac Output; D002304:Cardiac Pacing, Artificial; D005260:Female; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects; D005082:Physical Exertion