Automated External Defibrillators Defibrillation Cardioversion, and Pacing his chapter presents guidelines for defibrillation with Delays to either start of CPR or defibrillation can reduce automated external defibrillators(AEDs) and manual survival from SCA. In the 1990s some predicted that CPR defibrillators, synchronized cardioversion, and pacing. AEDs could be rendered obsolete by the widespread development of may be used by lay rescuers