Exhibited the parameters of VT + VF during 30 min ischemia. a: number of episodes of VT + VF, b: duration of VT + VF (s), c: arrhythmia score and d: incidence. Data were presented as mean ± SEM. Tested group rats compared I/R where *P < 0.05, **P < 0.01 and ***P < 0.001. Where VT = Ventricular tachycardia, VF = Ventricular fibrillation, NC = Normal Control, I/R = Ischemia reperfusion, SM = Sinomenine.