[The effects of oral rehydration on ischemia injury in gut in 40% blood volume loss in rats].

Objective: To investigate the effects of oral rehydration with glucose electrolyte solution(GES) on intestinal ischemia injury in 40% blood volume loss in rats.

Methods: SD rats were randomly divided into three groups (n=24): oral rehydration without hemorrhage (GES), hemorrhage without oral rehydration (HS), hemorrhage resuscitated with oral GES(HS + GES). About 4% of total blood volume was bled from the right common carotid artery of rats to produce a model of hemorrhagic shock. GES, which volume was three times of blood loss was given to GES group and HS + GES group in 0.5 h, 1 h and 6 h by a gastric tube post bleeding. The intestinal blood flow(IBF) were measured by laser Doppler at 2 h, 4 h and 24 h post hemorrhage. Animals were sacrificed, and specimens of intestinal tissue was taken for evaluation of Na+ -K+ -ATPase, diamine oxidase (DAO) and the rate of tissue water content, and assessment of the intestinal pathological changes.

Results: The IBF and the activity of Na+ -K+ -ATPase in HS+ GES group were dramatically higher than those in HS group (P < 0.05), and lower than those in GES group (P < 0.05). The water content of intestinal tissue in HS group were dramatically higher than those in GES group (P < 0.05), and lower than those at 2 h and 4 h, but dramatically higher than those at 24 h in HS + GES group. The activity of DAO at 24 h in HS+ GES group was higher than those in HS group (P < 0.05), and lower than those in GES group (P < 0.05). Less edema and hyperemia were found in HS + GES group than those in HS group at 24 h after bleeding.

Conclusion: It is indicated that oral rehydration alleviate edema and ischemia injury in gut by increasing intestinal blood flow and the activity of Na+ -K+ -ATPase and DAO in the resuscitation of hemorrhagic shock.