CRT Implantable Cardioverter Defibrillators

Safety and use information

Safety and Use

Find important safety and use information for our implantable devices and systems.

What Is a Cardiac Resynchronization Therapy Implantable Cardioverter Defibrillator (CRT-D)?

An implantable cardioverter defibrillator (ICD) is a microcomputer that is implanted under the skin of your upper chest area. It is small enough to fit in the palm of your hand. It monitors your heart rate and delivers therapy in the form of small electrical pulses. A cardiac resynchronization therapy implantable cardioverter defibrillator (CRT-D) is a type of specialized ICD used to treat heart failure.

How an ICD works

Once implanted, an ICD detects your heart rhythm through one or more thin, insulated wires called leads, which are placed on or inside the heart muscle and attached to the device. The leads transmit your heart rate information to the device. CRT-Ds are a type of ICD that have an additional lead that attaches to the left ventricle. When an abnormal heart rhythm occurs, your CRT-D sends an electric shock to your heart muscle.

CRT-Ds can provide lower- or higher-energy therapy to treat heart failure, depending on the need. Sometimes the defibrillating shock is uncomfortable and sometimes it is not. Whether you can feel it or not, your CRT-D is doing its work.

The St. Jude Medical commitment to safe, reliable and effective CRT-Ds

Since the first implantable pacemaker was developed in 1958, millions have benefited from pacemaker therapy. The remarkable story of the first cardiac pacemaker is embedded in St. Jude Medical’s history, and today, St. Jude Medical has once again demonstrated its commitment to revolutionizing cardiac rhythm management with the introduction of quadripolar cardiac resynchronization therapy. The Quadra Assura MP™ cardiac resynchronization therapy implantable cardioverter defibrillator (CRT-D) featured below is an example of our innovations in cardiac rhythm management.

NameQuadra Assura MP™ CRT-D

Learn more about the Quadra Assura MP™ CRT-D.