Continuously monitoring the heart rhythm it automatically functions as a pacemaker for slow heart rates and delivers electrical therapy or life saving shocks for fast heart rates. A diary stores all records of each episode. This includes the date, time, heart rate and electrical therapy. Replacement of the device usually occurs in 4-8 years.
Implantation is similar to a pacemaker procedure.
A pocket is formed under the skin near the collarbone. The ICD is then connected to the leads. EP testing is completed with the patient asleep to be sure the device functions normally. All surgical procedures contain risks. These should be discussed with the physician.