The third part of the system, the programmer, is used by a doctor or nurse to communicate with the pacemaker.
Pacing is when a pacemaker sends tiny electrical signals to the heart through a pacing lead.
If a pacemaker senses a natural heartbeat, it will not deliver a pacing pulse to the heart. This impulse travels through the insulated wires of a pacing lead until it reaches the metal electrode at the tip of the lead. The electrode, which is in direct contact with the heart, delivers the electrical impulse to the heart. The electrical impulse causes the heart tissue to begin a heartbeat. For some pacemakers, this timing is exactly the same for each heartbeat.