The effect of different frames filters on the prevention of pulmonary embolism in fracture patients subsequent with deep venous thrombosis on a multicenter prospective observational study.

BACKGROUND: A retrievable inferior vena cava filter (RIVCF) is used for the prevention of a pulmonary embolism, especially originated from deep venous thrombosis (DVT). However, which frame of RIVCF has an better effect on the specific thrombus has not been reported.

METHODS: All patients enrolled underwent RIVCF placement in the study, and the placement and retrieval followed the respective instructions of different brands of RIVCFs. During the study period, the frame of the filter, the combined fracture site and operation, and the filter trapped embolus (TE) were collected. The primary observation indicators of this study were the occurrence of TE in two frames of filters and different fracture sites. Secondary observation indicators were the occurrence of TE with two different frames filters in different fracture site and surgical site subgroups.

RESULTS: In all 2892 patients enrolled, RIVCF TE was detected in 308 cases (10.7%) according to our definition. Among them, there were 1968 cases of fusiform RIVCF and 924 cases of umbrella RIVCF. There were 663 patients combined with fractures before DVT. The incidence of TE was significantly higher in patients with fusiform RIVCF (230 [74.68%]) than in those with umbrella RIVCF (78 [25.32%]) (P < .05). In patients with below-the-knee fracture surgery, there was significant difference in the incidence of TE between the two frames of RIVCF (P < .05).

CONCLUSIONS: This conclusion suggests that, in patients with DVT secondary to below-the-knee fracture, the detached thrombus may be more suitable for prophylaxis with fusiform frame RIVCF.