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What is cardiac resynchronization therapy?

Cardiac resynchronization therapy is a treatment given to heart failure patients. During the procedure, a specialized biventricular pacemaker or implantable cardioverter defibrillator (ICD) is implanted. The ICD is a small battery-run device that is placed under your skin, through a vein and into your heart chamber. It re-coordinates the movements of the left and right ventricles of the heart, monitoring and treating abnormal heart rhythms and improving its pumping ability.

This procedure may be recommended if you:

  • Had a heart attack that left you with a weakened heart muscle
  • Survived cardiac arrest
  • Had ventricular tachycardia or ventricular fibrillation
  • Have a low ejection fraction of less than 35 percent (your heart muscle is not as strong as a normal heart muscle)
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