Implantable Cardioverter-Defibrillator (ICD) An implantable
cardioverter-defibrillator (ICD), also known as an automatic
implantable cardioverter-defibrillator (AICD), is a small device
that doctors use to watch for and fix life-threatening abnormal
heart rhythms. The doctor surgically implants the defibrillator
under the skin, usually below the left collarbone. A wire
threaded through a large vein connects the device to the heart.
If you have had a serious episode of an abnormally fast heart
rhythm or are at high risk for having one, you may need an ICD.
If you have coronary artery disease, heart failure, or a problem
with the structure or electrical system of the heart, you may be
at risk for an abnormal heart rhythm. How does an ICD work? An
ICD continuously monitors your heart. If it detects a life-
threatening rapid heart rhythm, it sends an electric shock to
your heart to restore a normal rhythm. The device then goes back
to its monitoring mode. After the shock, your heart may beat
very slowly for severa