[Influence of inhibitors of nitric oxide synthase and L-arginine on the survival rate in a rat model of traumatic shock].

Objective: To investigate the influence of inhibitors of nitric oxide synthase (NOS) and L-arginine on the survival rate in a rat model of traumatic shock.

Methods: A rat model of traumatic shock was established by fracturing the posterior limb of the rat. Nomega-nitro-L-arginine-methyl ester (L-NAME, non-selective NOS inhibitor, 10 mg/kg), amino- guanidine (AG, selective inducible nitric oxide synthase (iNOS) inhibitor, 100 mg/kg) and L-arginine (L-Arg, the precursor of nitric oxide (NO) synthesis 100 mg/kg) were injected intravenously during resuscitation,survival time and survival rate were observed.

Results: There were no significant changes in survival time and 24-hour survival rate between L-NAME ((23.80+/-9.09) hours and 40 percent) and control group (18.78+/-4.64)hours and 10 percent, both P>0.05); the survival time of AG group (28.72+/-6.25) hours and L-Arg group (30.64+/-8.77) hours prolonged apparently (both P<0.01), and 24-hour survival rate was also increased (both 80 percent, both P<0.01).

Conclusion: Selective iNOS inhibitor AG and L-Arg exert beneficial effects on after traumatic shock rats.