Through the study of color Doppler ultrasound imaging, to explore the mechanism of portal vein thrombosis for patients with liver cirrhotic portal hypertension splenectomy and its influencing factors.

From January 2013 to December 2013, a total of 284 cases of patients with cirrhosis and portal hypertension plenectomy plus pericardial devascularization in 302 Hospital of PLA were reviewed. Color Doppler ultrasound technique was employed to record the thrombosis of portal vein, splenic vein and superior mesenteric vein before and after the surgical procedure. According to the occurrence of portal vein thrombosis after splenectomy, patients were divided into portal vein thrombosis group and non portal vein thrombosis group; the factors that may affect the formation of portal vein thrombus were analyzed by using Logistic regression.

One hundred and twenty-nine cases of portal vein thrombosis occurred among the 284 patients with splenectomy, the incidence rate was 45.42% (129/284). Logistic regression analysis shows that inner diameters of splenic vein for the group with portal vein thrombosis are significantly different from that of the group without portal vein thrombosis (Z=2.034, P<0.05), postoperative inner diameter of portal vein (Z=2.037, P<0.05), and prothrombin time (Z=-2.171, P<0.05) are significantly higher in the group with portal vein thrombosis, while preoperative platelet count is significantly lower in the group with portal vein thrombosis (Z=-2.146, P<0.05); gender, preoperative hepatic artery flow velocity, and blood coagulation time are also the influencing factors of portal vein thrombosis (all P>0.05).

Color Doppler ultrasound technology can not only monitor, the thrombus formation in portal venous system post splenectomy, it can assess the risk factors of portal vein thrombosis post splenectomy.