Biphasic waveform defibrillation compensated defibrillation for he second time in limited time LoW-energy levels (150J correspond to 200-300J) Reduce the myocardial injuryBiphasic waveform defibrillation •A compensated defibrillation for the second time in limited time •Low-energy levels（150J correspond to 200-300J） •Reduce the myocardial injury