|ICD (implantable cardiac/cardioverter defibrillator)||
An ICD is an implantable cardioverter defibrillator. It is a device which is able to give the heart electrical shocks. An ICD looks similar to a pacemaker and is a little bigger than a match box. It is usually implanted under the collar bone.
An ICD device is made up of a pulse generator - which is a battery powered electronic circuit - and one or more electrode leads. The leads are placed into the heart via a vein. An ICD constantly monitors the heart rhythm and if it senses a dangerous abnormal heart rhythm it can deliver one of the following treatments:
Pacing to try and stop the abnormal heart rhythm. One or more small electrical shocks to stop the abnormal heart rhythm and restore the heart back to a normal rhythm.
Definition from British Heart Foundation: ICD