Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: Sep 17th, 2025

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Pacemakers, or pulse generators, are mechanical devices which are used to correct bradyarrhythmias (abnormally slow and/or irregular heart contractions). Demand pacemakers sense when the heart is sending its own impulses, and work only when the heart fails to beat, or on demand. Fixed-rate pacemakers send impulses to the heart and bring about a continuous steady rate.

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Innerbody Research does not provide medical advice, diagnosis, or treatment. You must consult your own medical professional.