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Figure 3 Biphasic waveform protocol. The initial shock was a 120-J biphasic shock. If the initial shock failed to defibrillate, the patient received a 150-J shock, and if that was unsuccessful, a 170-J shock was delivered. If all three biphasic shocks were unsuccessful, a 360-J damped sine wave monophasic shock was delivered. In addition, this protocol was applied to all patients, regardless of initial randomization, when an additional induction of ventricular fibrillation was required.