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How do pacemakers and defibrillators work? A cardiologist explains how they interact with the electrical system of the heart

  • Written by Virginia Singla, Clinical Assistant Professor of Cardiology, University of Pittsburgh
How do pacemakers and defibrillators work? A cardiologist explains how they interact with the electrical system of the heartElectrocardiograms, or ECGs, record the electrical activity of your heart. Randy Faris/The Image Bank via Getty Images

Your heart’s job is to keep your pulse steady to pump blood throughout your body. Sometimes your heart rate is slower when you’re relaxing, and sometimes it’s faster when you’re exercising or stressed. If...

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