Carlson J E, Yedlicka J W, Castaneda-Zuniga W R, Hunter D W, Amplatz K
Department of Radiology, University of Minnesota Hospital and Clinic, Minneapolis 55455.
J Vasc Interv Radiol. 1993 Jul-Aug;4(4):513-6. doi: 10.1016/s1051-0443(93)71908-9.
The clot-trapping efficiency of the Bird's Nest filter was studied in dogs with the stainless steel wires in a compacted versus fully elongated configuration.
Bird's Nest filters were placed infrarenally with the wires compacted in 10 dogs and with the wires elongated in an additional 10 dogs. The dogs were separated into two groups, five dogs with each wire configuration in each group. In group 1, 10 unlabeled 6 x 30-mm blood clots were injected into the inferior vena cava. In group 2, six 6 x 10-mm, four 6 x 15-mm, and four 6 x 30-mm labeled clots were introduced.
In group 1, clot-trapping efficiencies were 82% for the compacted versus 86% for the elongated configuration, as seen on serial cavograms and pulmonary angiograms. In group 2, clot-trapping efficiencies were 90% for the compacted versus 97% for the elongated configuration, as seen at fluoroscopy. Clot size did not affect trapping efficiency.
Acute clot-trapping efficiency of Bird's Nest filters did not differ when the wires were in a compacted versus elongated configuration. This study suggests that placement of a Bird's Nest filter in the elongated configuration may be satisfactory and may not indicate placement of a second filter.
研究鸟巢式滤器在犬体内，不锈钢丝呈压缩状态与完全伸展状态时的血栓捕获效率。
对10只犬经肾下放置鸟巢式滤器，其中5只犬的滤器钢丝呈压缩状态，另5只犬的滤器钢丝呈伸展状态。将犬分为两组，每组中每种钢丝状态各5只犬。第1组，向下腔静脉内注入10个未标记的6×30mm血凝块。第2组，引入6个6×10mm、4个6×15mm和4个6×30mm的标记血凝块。
在第1组中，连续腔静脉造影和肺血管造影显示，压缩状态下的血栓捕获效率为82%，伸展状态下为86%。在第2组中，透视检查显示，压缩状态下的血栓捕获效率为90%，伸展状态下为97%。血栓大小不影响捕获效率。
鸟巢式滤器钢丝呈压缩状态与伸展状态时，急性血栓捕获效率无差异。本研究提示，将鸟巢式滤器以伸展状态放置可能就足够了，可能无需放置第二个滤器。
