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Cardiac resynchronization therapy (CRT)

Learn how CRT devices can help your heart beat more efficiently and allow your doctor to monitor your health.

Looking for a health care professional? Find a specialist in your area.

If you’re considering a CRT device here are some questions to ask your doctor.

Getting to know your device

Already implanted with a CRT device? Go to the device support page for more information. 

Treating heart failure

With heart failure, your heart doesn’t pump as well as it should, so your blood fails to supply your body with the oxygen it needs. CRT devices help the heart pump properly in a coordinated way.

Who benefits from CRT?


Melanie, mother, singer, 36, diagnosed with congestive heart failure

“The fact that these devices exist means that I won’t need a heart transplant at this time, or perhaps ever.”


Walen, avid fisherman, 80, diagnosed with nonischemic dilated cardiomyopathy

“The heart failure device I have is not only a life saver, but it is a lifestyle. It’s given me an opportunity to live the life the way I want to live.”


Robert, outdoor enthusiast, 70, diagnosed with cardiomyopathy

“I feel confident working, going to the gym, and exercising, knowing that my device works. It is very comforting.”

How does the device work? 

CRT devices help your heart pump more efficiently and monitor your condition, so your health care team can provide the right treatment. By delivering tiny amounts of electrical energy, they restore normal timing of the heartbeats causing both ventricles to pump together more effectively. 

There are two types of CRT devices: CRT-P and CRT-D.  

A cardiac resynchronization therapy pacemaker (CRT-P), sometimes called a biventricular pacemaker, functions like a normal pacemaker and delivers small electrical impulses to the left and right ventricles to treat slow heart rhythms. 

A cardiac resynchronization therapy defibrillator (CRT-D) is a biventricular pacemaker with a built-in implantable cardioverter defibrillator (ICD). This device can treat both slow heart rhythms and dangerously fast heart rhythms (arrhythmias) that could lead to sudden cardiac arrest.   

What’s unique about Boston Scientific’s CRT devices?

Extended battery life

Like any battery, the energy in your implanted device will decrease over time. The battery’s life is affected both by how much energy is programmed to deliver the electrical impulse and how often it is required to pace or deliver therapy to your heart. Your physician will program the device to meet your individual needs. 

Boston Scientific RESONATE™ family of CRT-D devices are projected to last 8-15 years¹ and VISIONIST™ CRT-P devices are projected to last 7-14 years.² The 8-year product performance reports show that CRT-Ds with EnduraLife Technology have greater longevity than comparable devices.3-5


Boston Scientific
CRT-Ds still in service3


Viva™ XT CRT-Ds4 still in service


Viva Quad XT CRT-D5

Minute ventilation sensor technology

Boston Scientific CRT devices have special features called sensors. These sensors can detect an increase in your body’s motion or an increase in your breathing rate when you are more active. When the sensor detects this increase, it will adapt its pacing rate as needed. This increase in heart rate will change with your needs during everyday activities or exercise.

Heart failure monitoring

The Boston Scientific RESONATE™ family of CRT-D devices include a heart failure diagnostic. This diagnostic is a group of sensors within your device that continuously listens and checks on your heart. That information is sent remotely from your LATITUDE™ Communicator to your health care team daily through a secure website. Based on this information, your health care team is notified of changes in your heart health and may reach out to you.

Understanding the implant procedure

Typically, a CRT device is implanted just under the skin near your collarbone. The leads are placed in the heart’s right atrium, the right ventricle, and on the surface of the left ventricle of the heart. Prior to the procedure, your doctor will discuss which side of your chest the device will be implanted. 

Know the risks

While complications don’t happen very often, it’s important to know that there are risks associated with the implantation of any device or lead. You should talk with your doctor about these risks.

See our patient manuals for detailed safety information.

After CRT implantation 

Full recovery from surgery can take from several days to a few weeks. While you recover, your health care team may ask you to avoid strenuous activity (especially lifting and other activities that use your upper body). Doing so helps ensure the leads have time to firmly attach to your heart tissue. 

Follow-up care

Using wireless technology, your doctor can check your device remotely for easy and convenient follow-up visits. Remote monitoring and technology make health care more seamless, but you will need to see your doctor in-person for certain types of care.

CRT device

At Boston Scientific, we are dedicated to advancing heart rhythm management technologies by creating smaller, longer-lasting implants.

Boston Scientific’s Resonate HF


Boston Scientific’s most advanced CRT-D devices are equipped with an industry-leading device battery, a minute ventilation sensor to support daily activity levels, and exclusive heart failure diagnostic trends to better manage your heart condition.   

Boston Scientific’s Visionist x4


Boston Scientific’s most advanced CRT-P devices are equipped with an industry-leading device battery and exclusive minute ventilation sensor to support daily activity levels.  

Resources for you

Find a heart specialist near you

More support

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Already have a CRT device?

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Learn more about Boston Scientific

Important Safety Information

Cardiac resynchronization therapy pacemakers (CRT-P) and defibrillators (CRT-D) are designed to treat heart failure patients who may or may not have symptoms or who may have symptoms despite the best available drug therapy. They are also designed to help your heart pump more effectively and meet your body’s need for blood flow.  These devices are sensitive to strong electromagnetic interference (EMI) and can be affected by certain sources of electric or magnetic fields. With all medical procedures there are risks associated.  In regard to an implanted ICD, the risks include but are not limited to inappropriate shock, lead moves out of place, loss of stimulation capability, allergic reaction, fluid underneath the skin, and infection.  In rare cases device failure or death can occur.  Be sure to talk with your doctor so that you thoroughly understand all of the risks and benefits associated with the implantation of this system.  To obtain a copy of the device Patient Handbook for more detailed device safety information, go to,  or you can request a copy by calling 1-866-484-3268 or writing to Boston Scientific, 4100 Hamline Ave. N., St. Paul, MN  55112. 

Device Quality and Reliability

It is Boston Scientific’s intent to provide implantable devices of high quality and reliability. However, these devices may exhibit malfunctions that may result in lost or compromised ability to deliver therapy. Refer to Boston Scientific’s CRM product performance report on for more information about device performance, including the types and rates of malfunctions that these devices have experienced historically. While historical data may not be predictive of future device performance, such data can provide important context for understanding the overall reliability of these types of products. Also, it is important that you talk with your doctor about the risks and benefits associated with the implantation of a device.

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3. Boston Scientific Q4 2023 Product Performance Report survival probability including depletions and malfunctions of DYNAGEN/INOGEN/ORIGEN CRT-D at 8 years approved in the US April 2014, page 14, available online at HYPERLINK ""

4. Medtronic CRM Product Performance Report survival probability including normal battery depletion of, DTBA1BD1 Viva XT CRT-D at 8 years and market released on 29 January 2013, Medtronic product performance as of 1 December 2023, available online at Viva is a trademark of Medtronic and its affiliates.

5. Medtronic CRM Product Performance Report survival probability including normal battery depletion of, DTBA1QQ Viva Quad XT CRT-D at 8 years and market released on 3 July 2014, Medtronic product performance as of 1 December 2023, available online at Viva is a trademark of Medtronic and its affiliates.