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An automatic implantable cardioverter-defibrillator (AICD) is a device which is implanted in your chest. It is the size of a cell phone. This device reduces your risk of dying if your heart goes into a dangerous rhythm and stops beating (cardiac arrest). 

You may need an AICD if you have a dangerously fast heartbeat (ventricular tachycardia) or a chaotic heartbeat that makes it so your heart can't supply enough blood to the rest of your body (ventricular fibrillation).

AICDs work by detecting and stopping dangerous, abnormal heartbeats (arrhythmias). 

An AICD continuously monitors your heartbeat and delivers electrical shocks to restore a normal heart rhythm when necessary.



Courtesy of St Jude's Medical

Courtesy of NHLBI