Objective To observe the effect of inducible nitric oxide synthase inhibitor SMT on portal hypertension esophageal varices in rats.Methods\ 60 health male SD rats were randomly divided into five groups,sham operation group,model group,low dose SMT treatment group,middle dose SMT treatment group and high dose SMT treatment group.The portal vein and the left adrenal vein were not ligated in sham-operated group.The other groups were given a two-stage ligation of the portal vein plus ligation of the left adrena...