This is really very interesting as Dr. Wes points out there more and more of these implanted devices around now and I have never seen one actually react. Just yesterday I posted about the new Pacemaker St. Jude that sends data having it’s first successful implant in Canada. In the video below the device goes off and you can see the rest as it was captured live.
Use the link at the bottom of the page here to see the explanation in full from Dr. Wes. BD
Communicating with the patient's ICD with a programmer after such an event helps doctors determine the cause of ICD firings and assure the device was working as expected. Based on that information, medication therapies or device adjustments can be made to help prevent future firings. It should be noted that this event was NOT a "heart attack," or a sudden disturbance of the blood flow that supplies the heart, but rather an implantable cardiac defibrillator treating the sudden onset of a potentially lethal heart rhythm disturbance. As such, because the defibrillator responds so quickly, heart muscle function is usually preserved.