Why it's done

Cardiac resynchronization therapy is a treatment for heart failure in people whose ventricles don't contract in a coordinated fashion.

If you have heart failure, your heart muscle is weakened and may not be able to pump out enough blood to support your body. This can be worsened if your heart's chambers aren't in sync with each other.

Cardiac resynchronization therapy may reduce your symptoms of heart failure and lower your risk of heart failure complications, including death.