Lynch Frank C, Kekulawela Stephanie
Milton S. Hershey Medical Center, Penn State University College of Medicine, Hershey, Pennsylvania 17033, USA.
J Vasc Interv Radiol. 2009 Sep;20(9):1200-9. doi: 10.1016/j.jvir.2009.05.039. Epub 2009 Jul 29.
To investigate whether filters implanted for longer periods are more difficult or hazardous to remove.
A retrospective review of G2 inferior vena cava filter removals was performed. Objective measures reflecting the difficulty of the removal procedure were evaluated for differences required to remove a filter with an implantation period greater or less than 180 days.
One hundred seventy of 174 G2 filters were successfully removed (97.7% success rate). There was no significant difference in the success rate (P = .86), total procedure time (P = .87), fluoroscopy time (P = .13), or contrast medium use (P = .22) required to remove filters implanted for more than 180 days compared to those implanted for a shorter period of time. There was no significant difference in the frequency of filter movement (P = .90), tilt (P = .87), and caval penetration (P = .41) between the two groups. Six filter fractures were observed, all with implantation times greater than 180 days.
The removal of a G2 filter that has been in place for more than 180 days can be performed as easily, as safely, and with a similar degree of success as one that has been in place for less time. Movement, tilt, and penetration are early events after implantation that may have an effect on successful filter removal.
研究植入时间较长的滤器取出是否更困难或更具危险性。
对G2型下腔静脉滤器取出术进行回顾性研究。评估反映取出过程难度的客观指标，以比较取出植入时间大于或小于180天的滤器所需的差异。
174个G2型滤器中有170个成功取出（成功率97.7%）。与植入时间较短的滤器相比，取出植入时间超过180天的滤器在成功率（P = 0.86）、总手术时间（P = 0.87）、透视时间（P = 0.13）或造影剂使用量（P = 0.22）方面无显著差异。两组滤器移位（P = 0.90）、倾斜（P = 0.87）和腔静脉穿透（P = 0.41）的频率无显著差异。观察到6例滤器断裂，均发生在植入时间超过180天的情况下。
植入超过180天的G2型滤器取出操作与植入时间较短的滤器一样容易、安全，成功率相似。滤器移位、倾斜和穿透是植入后的早期事件，可能影响滤器的成功取出。
