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Cardiac Resynchronization Therapy

Medically reviewed by Last updated on Jul 7, 2024.

Cardiac resynchronization therapy (CRT) is a procedure used to treat problems with how your heart beats. CRT is also called biventricular pacing. The 2 upper chambers of the heart are called atria. The 2 lower chambers are called ventricles. Your heartbeat is synchronized when all areas of your heart beat together properly. When the areas of your heart do not beat as they should, your heart cannot pump enough blood and oxygen to your body. You may have trouble breathing, tire easily, and have swelling in your legs and feet.

Heart Chambers


Call your local emergency number (911 in the US) if:

Call your doctor or cardiologist if:


Device safety:

Some electrical devices may interfere with how your pacemaker works. Some examples are cell phones, security systems, power cables, and electric monitors. Ask your healthcare provider how long you can be near these devices, and which devices to avoid. Tell healthcare providers you have a pacemaker before you have a procedure or surgery.

Procedure area care:

Care for the area as directed. You may need to wash the area with soap and water. Dry the area and put on new, clean bandages as directed. Change your bandages when they get wet or dirty.

Follow up with your doctor or cardiologist as directed:

You will need to return to have your pacemaker checked. You may also need tests to check the leads in your heart. Write down your questions so you remember to ask them during your visits.

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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.