NPPB and ventricular fibrillation: We did not observe any correlation (P > 0.1 for all parameters) or an independent predictor (P > 0.3 for all parameters) for the rise or the trend of BNP, myoglobin, cardiac troponin I, creatine kinase, cycle length of ventricular fibrillation, duration of ventricular fibrillation, defibrillation threshold, serum creatinine and left ventricular ejection fraction.