Factors Affecting Inferior Vena Cava Filter Retrieval Success Rate
HC Lee, WY Wong, FH Ng, CS Chan, KL Lo
Hong Kong J Radiol 2019;22:197-201
https://doi.org/10.12809/hkjr1916917
Objective: To evaluate potential factors that may affect technical success rate in inferior vena cava filter attempts.
Methods: All inferior vena cava retrieval attempts from 2012 to 2016 at a single institution were reviewed.
Patient demographics, indications for procedure, inferior vena cava filter type, presence of angulation, filter dwell
time were compared between successful retrieval group and unsuccessful retrieval group. Statistical analysis was
performed by using unpaired t test, Mann-Whitney U test, or Fisher’s exact test, depending on the variables being
evaluated.
Results: A total of 29 patients with 30 inferior vena cava filter retrieval attempts were included. Overall retrieval
success rate was 83% (25 of 30). Inferior vena cava filter angulation of >15° was observed in 3 of 5 (60%)
unsuccessful retrievals compared with none of 25 (0%) successful retrievals (p = 0.002). Mean filter dwell time
was 61 days (median, 57 days) in unsuccessful retrievals compared with 51 days (median, 13 days) in successful
retrievals. However, the difference was not statistically significant.
Conclusion: vena cava filter with an angulation of >15° is associated with unsuccessful retrieval
attempts.
Author affiliation(s):
HC Lee, WY Wong, FH Ng, CS Chan, KL Lo: Department of Radiology, United Christian Hospital, Kwun Tong, Hong Kong
中文摘要
取出下腔靜脈濾器成功率的影響因素
李匡正、黃慧妍、吳豐謙、陳志生、勞結蓮
目的：評估影響取出下腔靜脈濾器成功率的潛在因素。
方法：回顧2012年至2016年期間在一所分區醫院進行的所有下腔靜脈濾器取出的病例。將成功取出下腔靜脈濾器和失敗兩組間的患者性別年齡、手術指徵、下腔靜脈濾器類型、濾器有否傾斜，以及濾器停留時間作比較。根據所評估的變量，使用非配對t檢驗、Mann-Whitney U檢驗或Fisher精確檢驗進行統計分析。
結果：共納入29名患者（涉及30例下腔靜脈濾器取出）。整體成功率為83%（25例）。在失敗的5例中（60%）有3例下腔靜脈濾器傾斜大於15°，而所有成功個案則無此情況（p = 0.002）。不能取出的濾器的平均停留時間為61天（中位數，57天），而成功取出的濾器平均停留時間為51天（中位數，13天），兩組無統計學差異。
結論：下腔靜脈濾器的傾斜角度大於15°與不能成功取出相關。