Cardiac Resynchronization Therapy

Overview

Cardiac resynchronization therapy device

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Cardiac resynchronization therapy (CRT) devices, sometimes called biventricular pacemakers, are small, electronic devices placed under the skin in your chest to help the left and right sides of the heart beat in unison. Doctors often use CRT with a device that monitors the heart's rhythm and sends an electric shock to correct abnormal rhythms (implantable cardioverter defibrillator, ICD).

You generally are able to recover and resume normal activity within a few weeks. The CRT device comes with a transmitter and will be monitored regularly through telephone-monitoring and follow-up appointments. In follow-up appointments, a doctor checks the function and the battery-life of your devices. When the battery runs low, the device's generator can be replaced during an outpatient procedure.

Mayo Clinic doctors with specialized training in the diagnosis and treatment of heart conditions (cardiologists) implant cardiac resynchronization therapy devices to help treat some people with congestive heart failure.

Advantages of cardiac resynchronization therapy (CRT)

CRT may:

• Help your heart pump more effectively
• Treat slow heartbeats (bradycardia)
• Improve your quality of life
• Decrease your heart failure symptoms
• Lower your risk of hospital admissions
• Increase how much blood your lower heart chamber (left ventricle) is pumping (ejection fraction)
• Improve your exercise tolerance
• Lower your risk of death due to heart failure

Risks

Implanting a CRT device is generally a minor procedure, but it may still involve some risks, which could include:

• Allergic reaction to anesthesia
• Damage to blood vessels near the CRT device
• Infection where the CRT device was implanted
• Swelling, bruising or bleeding

Mayo Clinic cardiologists will talk with you to determine whether cardiac resynchronization therapy is appropriate for your situation. Other treatments, such as heart transplant, may be necessary.

Related book: Mayo Clinic Healthy Heart for Life! book provides an easy-to-follow plan to prevent and conquer heart disease.