Implantable cardiac defibrillator

The device is inserted under the skin in the chest or abdomen.  The procedure is similar to that of a pacemaker insertion.  One wire is connected to the heart and another is connected to the defibrillator unit.  The defibrillator unit monitors the heart rhythm, sends an electrical shock and keeps a record of the events.

If the heart is beating normally, the ICD is inactive.  When an abnormal, fast heart rate, known as a "tachycardia", is detected, the ICD will send electric shock signals to the heart.  The electric shock converts the abnormal rhythm to a normal rhythm.  The low energy electric shocks delivered by the ICD do not harm the patient or anyone in physical contact with the patient.  The patient may feel the symptoms of the tachycardia as it begins. 

Call 911 immediately if any of the following occur:

• tachycardia persists after feeling the shock signals
• tachycardia persists and no shock signals are felt
• a series of shocks are felt

After the ICD is inserted, the physician will advise the patient about limiting activities for a time while the incision heals.  Most patients resume normal activities after recovering from the procedure.  Every patient is given an ICD identification card to be carried with the patient at all times.  The card provides information about the ICD and instructions in case of emergency.

It is safe for the patient with an ICD to be around most household electrical appliances.  Other sources that can interfere with the ICD are MRI scans, digital cellular phones, metal detectors at airport security gates, heavy-duty electrical power equipment, arc welders, a running car engine (do not lean over the engine), and certain electrical power surgical tools.  A healthcare provider discusses these and other precautions with the patient.

Last Reviewed: 2005

Disclaimer: This content is reviewed periodically and is subject to change as new health information becomes available. The information provided is intended to be informative and educational and is not a replacement for professional medical evaluation, advice, diagnosis or treatment by a healthcare professional.

HIL File CARD4308.RF2 VRS# 4308 Data Version 7.0 Copyright 2000 McKesson Health Solutions LLC. All rights reserved.