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How Does a Pacemaker Work? Banner
Heart & Vascular Services

Mercy Heart & Vascular Center at Mercy St. Vincent Medical Center
2400 Cherry Street
Toledo, OH 43608
(419) 251-3232

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How Does a Pacemaker Work?

There are two parts to a pacemaker:  1.) A pulse generator  2.) Insulated Leads.     Some pacemakers have one lead and some have two.

The pulse generator is a small metal box with a small electronic chip and a battery. The battery supplies the power and the electronic chips acts like a computer program. The electronic chip senses the heart's beat and then sends out an electric signal.

The newest models of pulse generators weigh less than an ounce. They need to be replaced, about every 6 years when the battery dies.

The leads go from the pulse generator to the heart muscle through blood vessels. They can tell how fast the heart is beating and send that information to the pulse generator. Based on the information from the pulse generator, the leads send electrical signals to the heart which cause it to beat

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