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What do the generator and leads of a pacemaker do?

A pacemaker has two parts:

  • A pulse generator: the battery and circuits that create low-energy electrical pulses. The generator is a little larger than a quarter and less than 1/4 inch thick.
  • Leads: thin insulated wires that deliver the electrical pulses to your heart. A single-chamber pacemaker uses one lead to send pulses to the heart’s upper or lower chamber. A dual-chamber pacemaker uses two leads: one in the upper chamber and one in the lower chamber. A biventricular pacemaker has three leads. They are placed in the right upper chamber, right lower chamber, and left lower chamber.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.