Objective:To investigate the feasible and effective means for the treatment of the lower extremity deep venous thrombosis(DVT).Methods:The clincal data of 186 cases of lower extremity DVT treated in recent 6 years were analysed retrospectively. Vena cava filters(VCF) were placed in 116 patients

including 62 cases which underwent embolectomy after IVC filter placement. 54 cases underwent intraluminal cathter-directed thrombolysis with urokinase continuous infusion immediately.Results:149 patients(80.1%) were followed up for 3~72 months with an averge of 40 months.All of the IVC filters were successfully expanded. 8 cases had a little swelling

which disappeared after a week. Occlusion in 2 cases 18 months after the IVC filter placement

others were patent. In thrombolytic group

45 were cured

6 improved

3 ineffective.In operative group

54 were cured

6 improved

2 ineffective.In anticongulation group

13 were cured

43 improved

14 ineffective.The cured rate and the total effective rate in operative group and thrombolytic group is similar(P>0.05)

but those of the two groups were better than the anticongulation group(P<0.05). conclusions:Vena cava filters placement can effectively prevent the formation of pulmonary embolism.but the indication should be strict.Combination of surgery with other therapy is effective in improving the results and preventing the sequela of lower extremity DVT.