Objective To evaluate the effects of magnesium sulfate and dexamethasone against ischemia-reperfusion injury of the small intestine in SD rats,and explore the mechanism.Methods\ Rat model of small intestine I/R injury was used.The SD rats were divided into five groups randomly: sham operation group,ischemia-reperfusion group,magnesium sulfate group,dexamethasone group,and magnesium sulfate plus dexamethasone group.The plasma contents of malondialdehyde(MDA),the activity of diamine oxidase(DAO) in plasma wer...