Objective:To compare the effects of Shenfu Injection(SFI) and epinephrine(EPI) on catecholamine levels in a porcine model of prolonged cardiac arrest(CA).Methods:After 8 min of untreated ventricular fibrillation,24 Wuzhishan miniature pigs were randomly assigned to one of the three groups(n=8 per group) and received central venous injection,respectively:SFI group(1 mL/kg),EPI group(20 μg/kg EPI),and normal saline(NS) group.Cardiac output(CO),maximum rate of increase/decrease in left ventricular pressure(±dp/dt),serum levels of EPI,norepinephrine(NE),and dopamine(DA) were determined at baseline and at 0.5,1,2,and 4 h after restoration of spontaneous circulation.Results:The duration of cardiopulmonary resuscitation was shorter in the EPI and SFI groups than in the NS group(P<0.05).The EPI level increased significantly after restoration of spontaneous circulation(ROSC) in all three groups,and was significantly different between the EPI group and the other two groups immediately after ROSC(both P<0.01),but these differences gradually disappeared over time.There were no significant differences in NE or DA levels among the three groups,and there were no correlations between catecholamine levels and CO or dp/dt(P>0.05).Conclusions:SFI did not significantly affect endogenous catecholamine levels during cardiopulmonary resuscitation after prolonged ventricular fibrillation.However,SFI improved oxygen metabolism,and produced a better hemodynamic status compared with EPI.SFI might be a potentially vasopressor drug for the treatment of CA. Objective: To compare the effects of Shenfu Injection (SFI) and epinephrine (EPI) on catecholamine levels in a porcine model of prolonged cardiac arrest (CA). Methods: After 8 min of untreated ventricular fibrillation, 24 Wuzhishan miniature pigs were randomly assigned to one of the three groups (n = 8 per group) and received central venous injection, respectively: SFI group (1 mL / kg), EPI group (20 μg / kg EPI), and normal saline (NS) Serum levels of EPI, norepinephrine (NE), and dopamine (DA) were determined at baseline and at 0.5,1,2, and 4 h (CO), maximum rate of increase / decrease in left ventricular pressure (± dp / dt) after restoration of spontaneous circulation.Results: The duration of cardiopulmonary resuscitation was shorter in the EPI and SFI groups than in the NS group (P <0.05). EPI level increased significantly after restoration of spontaneous circulation (ROSC) in all three groups, and was significantly different between the EPI group and the other two groups immediately after RO SC (both P <0.01), but these differences were consistently less than over time. There were no significant differences in NE or DA levels among the three groups, and there were no correlations between catecholamine levels and CO or dp / dt (P> 0.05) .Conclusions: SFI did not significantly affect endogenous catecholamine levels during cardiopulmonary resuscitation after prolonged ventricular fibrillation. Despite, SFI improved oxygen metabolism, and produced a better hemodynamic status compared with EPI. SFI might be a potentially vasopressor drug for the treatment of CA.