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How a pacemaker works with the heart

How a pacemaker works

A pacemaker is designed to mimic the heart’s natural pacemaker, the sinus node. The pacemaker has two main purposes – pacing and sensing.

  • Pacing: A pacemaker will send an electrical impulse to the heart through a pacing lead when the heart’s own rhythm is too slow or interrupted. This electrical impulse starts a heartbeat.
  • Sensing: A pacemaker will also “sense” (monitor) the heart’s natural electrical activity. When the pacemaker senses a natural heartbeat, it will not deliver a pacing pulse.

The SureScan® pacing system is “MR-conditional” meaning that it is designed to allow patients to undergo MRI under specified conditions for use. A complete system, consisting of a Medtronic Advisa MRI™ SureScan Pacemaker or Revo MRI® SureScan Pacemaker implanted with two CapSure Fix MRI® SureScan leads, is required for use in the MRI environment.