What is an automatic implantable cardioverterdefibrillator (AICD)?
An AICD is an implantable device capable of detecting ventricular tachycardia or fibrillation and terminating these dysrhythmias by antitachycardia pacing or cardio-version/defibrillation. AICDs also have pacing functions incorporated as a back-up for bradydysrhythmias follow-ing defibrillation or in patients who are pacemaker-dependent and also need to have a defibrillator implanted. Patients presenting with AICDs usually have significant cardiovascular disease and are at high risk of sudden car-diac death due to ventricular tachydysrhythmias. The list of indications for implanting AICDs is rapidly growing and subject to ongoing studies.