The incidence of IVCF thrombosis was 35.25% (49/139) in the first 30 days after the IVCF placement and decreased to 22.73% (5/22) between 30 to 60 days of dwell time and to 18.18% (2/11) between 60 and 90 days of dwell time, indicating a decreasing trend within the first 90 days.
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Incidence and risk factors for inferior vena cava filter thrombosis detected at time of filter retrieval in patients with lower extremity deep vein thrombosis: a multicenter retrospective cohort study.
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Therefore, the relationship between IVCF thrombosis and symptom onset time and proximal LEDVT was analyzed in the present study, with the results showing that these factors were associated with a significantly higher risk of IVCF thrombosis (P<0.05); however, these factors did not reach statistical significance after the multivariate analysis, implying that the time from symptom onset to admission ≤7 days and proximal LEDVT may be not independent risk factors for IVCF thrombosis.