MedTerms Medical Dictionary

ICD: Implantable cardiac defibrillator, a device that is put within the body and is designed to recognize certain types of abnormal heart rhythms (arrhythmias) and correct them.

Defibrillators continuously monitor the heart rhythm in order to detect overly rapid arrhythmias such as

• Ventricular tachycardia (rapid regular beating of the ventricles, the bottom chambers of the heart); and
• Ventricular fibrillation (rapid irregular beating of the ventricles).

These ventricular arrhythmias impair the pumping efficiency of the heart and greatly raise the risks of fainting (syncope) and sudden cardiac arrest. They tend to develop in people with coronary artery disease or heart muscle diseases (cardiomyopathies). They are life- threatening.

A defibrillator can be implanted within the body by far less invasive techniques than in the past because the devices, aside from being more technologically advanced, are smaller. (An implantable defibrillator is about the size of a pager).

The defibrillator corrects the heart rhythm by delivering precisely calibrated and timed electrical shocks, when needed, to restore a normal heartbeat.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Find a medical definition by using the A-Z listing (select a letter)

Copyright © 1996-2003 MedicineNet, Inc. All rights reserved.
MedicineNet, Inc. does not endorse any of the services or products offered on this page.

Information in the MedTerms Medical Dictionary is provided for informational purposes only and is not a substitute for professional medical advice. You should not use this information for diagnosing or treating a medical or health condition. You should carefully read all product packaging. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider.

Use the A-Z listing (select a letter) to find a definition

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z