| Objectives: The aim of the study was to investigate the application value of the ultrasound in the case selection during pre-operation, the instant effect evaluation during the operation and the post-operative effect evaluation of encircling constriction operation and discuss the clinical value of ultrasound in the evaluation of encircling constriction (EC) of superficial femoral vein (SFV) in the treatment of primary deep venous valve insufficiency (PDVVI).Methods: Before the operations, eighty-nine patients who were proved to be PDVVI by ascending venography, all of them were examined by ultrasound to observe the function of the superficial femoral venous valve and exclude the patients with the deep venous thrombus. One patient was found that courser anomaly of the superficial femoral vein by the ultrasound examination. There was the least reflux of the superficial femoral venous valve, but the heavy reflux of the popliteal was been found. Therefore, we performed the encircling constriction of the popliteal venous valve. Eighty-eight patients who were divided into two groups, the experiment group (n = 45) and the control group (n = 43). All patients in both groups were treated with the traditional encircling constriction operation at the first valve of the superficial femoral veins. At the same time, the great saphenous veins were highly ligated and ablated,the superficial veins were ablated and the perforated veins were ligated. The ultrasound was performed to assist the operations in the experiment group. Before encircling constriction, the ultrasound examination was to observe the appearance and the function of the superficial femoral venous valves and judge the effects of the EC. After encircling constriction, it was to direct the dimensions of the"ring". The lasting time of reflux flow of the veins was used to evaluate the short-term effects. All patients in both groups were examined by the color doppler ultrasound after the operations. Such parameters as the effective power of valve functional recovery, the clinical CEAP(Clinic,Etiologic,Anatomic and Pathophysiological) classification and the scoring were used to evaluate the follow-up effects of the EC operation.Results: In the experiment group, the valves in four cases were found by color doppler ultrasound to be completely destroyed and received other operations. In the operation, the inner diameters of the superficial femoral veins and the lasting time of reflux flow of the venous valves detected by the ultrasound were shortened greatly after the encircling constriction (P < 0.01), and the venous blood flow rates increased obviously after the encircling constriction examined by the ultrasound (P < 0.01). After the operation, the effective power of valve functional recovery between the two groups had significant statistical difference with 100% (41/41) in the experiment group compared to 88.37% (38/43) in the control group. The excellence power was 95.12% (39/41) in the experiment group and 65.12% (28/43) in the control group. The results of CEAP classification showed that the effective power of EC operation was 92.68% (38/41) in the experiment group and 76.74% (33/43) in the control group. The effective power of EC operation between the two groups had significant statistical difference. The clinical symptom of the two group were all ameliorated obviously, but the amelioration of the experiment group was superior to the control group's (P <0.01).Conclusions: (1) The application of the ultrasound in the pre-operative case selection, the instant effect evaluation during the operation and the post-operative effect evaluation of the superficial femoral vein encircling constriction operation had important clinical values. (2). The assistance with the ultrasound in the superficial femoral vein encircling constriction operation was helpful to adjust the position and the dimension of the"ring", decrease the blindness, improve the directions effectively, and increase the effects of the recovery of the valve function.
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