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Alternative NamesICD; Defibrillation
Definition Return to top
An implantable cardioverter-defibrillator (ICD) is a device that detects any life-threatening, rapid heartbeat. If such a heartbeat, called an arrhythmia, occurs, the ICD quickly sends an electrical shock to the heart to change the rhythm back to normal. This is called defibrillation.
Description Return to top
An ICD is made of these parts:
A surgeon will insert your ICD when you are awake. The area of your chest wall below your collarbone will be numbed with anesthesia, so you will not feel pain. The surgeon will make an incision (cut) through your skin and create space under your skin and muscle for the ICD generator. Usually this space is made near your left shoulder.
Using special x-ray to see inside your chest, the surgeon will place the electrode into a vein, then into your heart. Then the surgeon will connect the electrodes to the pulse generator and pacemaker.
The procedure usually takes 2 to 3 hours.
Why the Procedure is Performed Return to top
An implantable cardiac defibrillator is placed in people who are at high risk of sudden cardiac death. Reasons you may be at high risk are:
Risks Return to top
Risks for any surgery are:
Possible risks for this surgery are:
An ICD sometimes delivers shocks to your heart when you do not need them. Even though a shock lasts a very short time, you can usually feel it.
This and other ICD problems can sometimes be prevented by changing how your ICD is programmed. It can also be set to sound an alert if there is a problem. Your electrophysiologist, the doctor who manages your ICD care, can program your device.
Before the Procedure Return to top
Always tell your doctor or nurse what drugs you are taking, even drugs or herbs you bought without a prescription.
The day before your surgery:
On the day of the surgery:
Your doctor or nurse will tell you when to arrive at the hospital.
After the Procedure Return to top
Most people who have an ICD implanted are able to go home from the hospital in 1 day. Most quickly return to their normal activity level. Full recovery takes about 4 to 6 weeks.
When you leave the hospital, you will be given a card to keep in your wallet. This card lists the details of your ICD and has contact information for emergencies. You should always carry this wallet card with you.
You will need to make regular visits to the doctor so your ICD can be monitored. The doctor will check to see if the device is properly sensing your heartbeat, how many shocks have been delivered, and how much power is left in the batteries.
Outlook (Prognosis) Return to top
Your ICD will constantly monitor your heartbeats to make sure they are steady. It will deliver a shock to the heart when it senses a life-threatening rhythm. This device can also work as a pacemaker.
References Return to top
Epstein, A E, DiMarco, J P, Ellenbogen, K A, Estes, N A, 3rd, Freedman, R A, Gettes, L S, et al. (2008). "ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the ACC/AHA/NASPE 2002 Guideline Update for Implantation of Cardiac Pacemakers and Antiarrhythmia Devices): developed in collaboration with the American Association for Thoracic Surgery and Society of Thoracic Surgeons." Circulation;117(21): e350-408.
Hayes DL, Zipes DP. Cardiac pacemakers and cardioverter-defibrillators. In: Libby P, Bonow RO, Mann DL, Zipes DP, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 8th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 34.Update Date: 12/13/2008 Updated by: Larry A. Weinrauch MD, Assistant Professor of Medicine, Harvard Medical School, Cardiovascular Disease and Clinical Outcomes Research, Watertown, MA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.