Without an ICD or an external defibrilltor, the chances of surviving an episode of sudden cardiac arrest are only 5%. The ICD is the best way to terminate a dangerous cardiac arrhythmia, proven to terminate 98% of fatal arrhythmias. The primary purpose of the device is to make you be safer, so it should also help you feel safer. Feeling secure is the result of a combination of actually being safer and trusting the plan to keep you safer. The clinical care and medications you receive are part of that plan – so is your ICD.