Active Comparator: Zoll defibrillator waveform used after unsuccessful second full output shock.
Participants who received first shock via Zoll that do not have success after a second full output shock will be crossed over to the Lifepak defibrillator waveform and receive up to 2 full output shocks with a minimum of 1 minute between each shock to ascertain the outcome of the immediately prior shock.
Device: Lifepak external defibrillator
Patients with AF will be randomized to receive a full output synchronized 360J shock using a BTE waveform from a Lifepak defibrillator
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