ObjectiveTo establish a model of portal hypertension with hypersplenism in SD rats by portal vein binding combined with splenic vein ligation. MethodsSixty healthy male SD rats were randomly divided into three groups: sham operation group （only laparotomy, n=20）, portal vein binding group (only binding, n=20), and portal vein binding combined with splenic vein ligation group (combined operation group, n=20). The counts of platelet, erythrocyte, and leukocyte were examined just before operation and once a week after operation for 7 weeks. Portal pressure, shortaxis, and longaxis diameter of spleen were examined just before operation and seven weeks after operation. At the seventh week, all the animals were sacrificed, spleen index and pathology changes of each group were examined. ResultsErythrocyte and platelet counts in combined operation group were significantly lower than those in the other two groups on the third week （Plt;0.05）, and there was no significant difference in leukocyte count among three groups （Pgt;0.05）. Compared with the preoperative value, portal pressure increased significantly on the seventh week in both portal vein binding group and combined operation group, and was higher than that in the sham operation group （Plt;0.05）. The two diameters of spleen also increased significantly in combined operation group on the seventh week （Plt;0.05）, and were larger than those in the other two groups （Plt;0.05）. The same result was found in spleen index （Plt;0.05）. Typical pathological changes of hypersplenism presented only in combined operation group on the seventh week after operation. ConclusionsPortal vein binding combined with splenic vein ligation can induce experimental secondary hypersplenism successfully. This procedure is simple and stable, and helpful to the scientific research.
