Thrombus Burden, Caval Thrombosis, and Retrieval of the Denali Inferior Vena Cava Filter

The purpose of this study was to evaluate outcomes of the Denali inferior vena cava filter (Bard Peripheral Vascular, Tempe, Arizona). Five hundred patients had 508 filters placed between 2015 and 2022. Filters were retrieved at the study site in 284 patients: 159 (31.4%) filters were deemed permanent and 21 (4.1%) filters were retrieved at an outside hospital; 27 (5.3%) patients had outside-hospital follow-up without known retrieval and 17 (3.3%) patients were lost to follow-up. Initial retrieval at the study site was successful in 275 cases, while 7 cases had successful second retrieval attempts (99.3% overall success). Initial retrieval venogram showed clot in filter in 18 of 284 (6.3%) and an occluded cava in 12 of 284 (4.2%). Contrast-enhanced imaging was available in 79 patients without retrieval at study site: 7 of 79 (8.9%) had thrombus within the filter, 7 of 79 (8.9%) had caval thrombosis/occlusion/severe stenosis, and 1 of 75 (1.2%) had new nonocclusive caval thrombus. No filter fracture, clinically significant extravascular strut penetration, or migration was reported.