Long-term results of inferior vena cava filters: Experiences in a Japanesepopulation

Objective In this prospective, non-controlled observational study, we evalu ated the middle- to long-term results of placement of inferior vena cava (I VC) filter devices in Japanese patients. Methods and results In 42 Japanese patients with deep vein thrombosis (DVT) or pulmonary thromboembolism (PTE) who underwent percutaneous insertion of IVC filters, follow-up examinations at fixed intervals of 2 years were per formed, and the data was evaluated including complications. There were no f atal complications during IVC filter implantation. About 5% of patients wit h an inserted NC filter developed symptomatic PTE, another 5% developed asy mptomatic PTE. The trapped thrombus was demonstrated in about 22% of the in serted IVC filters. Lower rates of PTE development, occlusion of IVC, and c aptured thrombus were found in the cases where concurrent use of anticoagul ation therapy with filters was used. Trapped thrombi were found in half of IVC filters inserted prophylactically for proximal femoral venous thrombosi s. Conclusion These experiences with IVC filters suggest that they are safe an d effective for the prevention of PIE in the Japanese population.