Techniques used for difficult retrievals of the Günther Tulip inferior vena cava filter: experience in 32 patients.

<bold>Purpose: </bold>To retrospectively review experience with difficult retrievals of Günther Tulip filters (GTFs) in which various techniques were used. <bold>Materials and Methods: </bold>From December 2004 to December 2006, 32 patients were referred to a single radiology department for GTF retrieval (25 women and seven men; mean age, 40 years; range, 21-60 y). All patients were evaluated, and 22 of these patients had undergone unsuccessful filter retrieval attempts elsewhere. In the remaining patients, significant tilt of the filter (n = 8) or difficult internal jugular vein access (n = 2) discouraged retrieval attempts. There were a total of 38 filters. Twenty-five patients had a filter in the infrarenal inferior vena cava (IVC). Among the remaining seven patients, six had bilateral iliac filters and one had a left iliac filter. Retrievals were performed via conventional technique-ie, by snaring the hook of the filter without additional maneuvers-or other techniques. <bold>Results: </bold>Thirty-seven of 38 filters were successfully removed, for a success rate of 97%. Successful retrievals were performed with conventional (n = 4), catheter twist (n = 3), modified snare (n = 15), loop snare (n = 14), and balloon dilation (n = 1) techniques. The average dwell time for filters successfully removed was 58 days (range, 22-258 d). One failure occurred in a patient who had undergone unsuccessful retrieval previously. The hook of the filter and a displaced secondary strut, which had migrated superiorly, were incorporated into the IVC wall in this case. <bold>Conclusions: </bold>Additional maneuvers were useful in these difficult retrievals of GTFs that might not otherwise be retrievable with the conventional method. [ABSTRACT FROM AUTHOR]