The biventricular pacemaker or cardiac resynchronization therapy (CRT) device is a more advanced pacemaker with three leads. This device typically treats heart failure. The doctor places the leads in the right ventricle, right atrium, and the coronary sinus vein to pace the left ventricle. Electrical impulses cause the two lower chambers to contract, which prompts the right and left ventricles to pump together, creating balance and improved cardiac function.

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