Objective To investigate the effects of hypertonic saline (HTS) treatment on the function and susceptibility to sepsis of reticuloendothelial system (RES) in mice with hemorrhagic shock. Methods Forty percent of total blood volume of male Balb/c mice was withdrawn by cardiac puncture. Two hours later, the mice were treated with blood infusion and normal saline (10 ml/kg) or 7.5% NaCl (10 ml/kg).The survival rate of the mice was observed after cecal ligation and puncture (CLP). The phagocytosis function of the RES was measured by carbon clearance rate(α) and carbon amount ingested by the macrophages of liver and spleen. In vitro, the peritoneal phagocyte function in solutions of different osmotic pressor was measured by assaying neutral red amount taken in. Results The survival rate after CLP in HTS treated group was 70%, whereas all the mice in the normal saline group died. At the third hour after hemorrhagic shock, the RES carbon clearance rate(α) and carbon amount ingested by the macrophages of liver in the HTS treated mice were 5.61±0.42 and 0.59±0.19 respectively, significantly higher than those in the normal saline treated mice (4.15±0.62， 0.42±0.16). In vitro, hyperosmolarity below 40 mmol/L had no significant effects on the phagocytosis activity of peritoneal macrophages in mice. Conclusion Treating hemorrhagic shock with HTS can decrease the susceptibility to sepsis and improve the RES phagocytosis function indirectly.
ObjectiveTo study the techniques of mimicking multifactors induced acute pancreatitis in rat by slow-release pump. MethodsSeventy-five healthy SD rats were randomly divided into slowrelease pump group (SRP group), traditional group (TAP group), and sham operation group (SO group). Four percent sodium taurocholate was injected through pancreatobiliary duct of rats directly and retrogradely in TAP group and by slow-release pump in SRP, which mimicked AP pathogenesis from selfdigestion, obstruction, cytokine activation, and many other mechanisms. Detection of serum amylase and pancreatic myeloperoxidase (MPO) leves, observation of pancreatic histological changes and scoring of pancreatitis severity in three groups were performed at 1, 6, 12, and 24 h after successful model induction, respectively. ResultsSerum amylase and pancreatic MPO levels, and the pathological grading score of rats were significantly higher in SRP and TAP groups than in SO group at different time point (Plt;0.05 or Plt;0.01), while they were lower in SRP group than in TAP group with a slowly rising tendency, and there were significant differences at 6 and 12 h time point, respectively (Plt;0.05 or Plt;0.01). Conclusions Slow-release pump technique can induce AP through increasing the pressure of pancreatic duct, tissue edema and sustained releasing inflammation factors by mimicking the pathophysiological process of pancreatitis. Slow-release pump can be kept in place to monitor and control the pressure of pancreatic duct. Slow-release pump method is relatively moderate and easy to manage with a lower mortality.