What you can expect

Cardiac resynchronization therapy requires a minor surgical procedure to implant a device in your chest.

You'll likely be awake during the procedure, though the area where the pacemaker is implanted is numbed and you'll receive medication to help you relax (conscious sedation). The procedure typically takes a few hours.

During surgery, insulated wires (leads, or electrodes) are inserted into a major vein under or near your collarbone and guided to your heart with the help of X-ray images. One end of each wire is attached to the appropriate position in your heart. The other end is attached to a pulse generator, which is usually implanted under the skin beneath your collarbone.

Cardiac resynchronization therapy devices include:

• Cardiac resynchronization therapy with a pacemaker (CRT-P). The device used for cardiac resynchronization therapy has three leads that connect the pacemaker to the right upper chamber of your heart (right atria) and both lower chambers (ventricles).
• Cardiac resynchronization therapy with a pacemaker and an ICD (CRT-D). This device may be recommended for people with heart failure who also have a risk of sudden cardiac death. It can detect dangerous heart rhythms and deliver a stronger shock of energy, which is able to reset your heartbeat, than a pacemaker can deliver.

You'll usually stay overnight in the hospital after cardiac resynchronization therapy. Your doctor will test your device to make sure it's programmed correctly before you leave the hospital. Most people can return to their usual activities after a few days.