An Automatic Implantable Cardioverter Defibrillators (AICD or ICD) is a permanent device which monitors person’s abnormal heart rate. This device is mainly into patients with decreased heart function.Abnormal heart beats are known as Arrhythmias and it occurs when heart does not beat normally. The AICD gives heart a shock in case of life threatening arrhythmias or an abnormally high heart rate.