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Published on: July 20, 2022
Thrombus Burden, Caval Thrombosis, and Retrieval of the Denali Inferior Vena Cava Filter
Vansh S Jain1, Christine Johnstad1, Sofia Ferrer1
1University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
Insights
The Denali inferior vena cava filter demonstrated a high retrieval success rate of 99.3% with no reported device fractures or migrations. Post-retrieval imaging revealed minimal thrombus in a small percentage of patients.
Area of Science:
- Vascular Surgery
- Interventional Radiology
- Medical Device Evaluation
Background:
- Inferior vena cava (IVC) filters are crucial for preventing pulmonary embolism in high-risk patients.
- Evaluating the long-term outcomes and retrieval success of specific IVC filter models is essential for clinical practice.
- The Denali IVC filter is a commonly used device, necessitating a thorough assessment of its performance.
Purpose of the Study:
- To assess the clinical outcomes and retrieval efficacy of the Denali inferior vena cava filter.
- To identify any complications associated with the Denali filter, including thrombus formation and device integrity.
- To evaluate the safety and success rates of filter retrieval procedures.
Main Methods:
- Retrospective analysis of 508 Denali IVC filter placements in 500 patients between 2015 and 2022.
- Detailed review of filter retrieval procedures, success rates, and complications.
- Assessment of imaging data, including venograms and contrast-enhanced imaging, to evaluate for thrombus and caval abnormalities.
Main Results:
- An overall retrieval success rate of 99.3% was achieved, with 275 initial successful retrievals and 7 successful second attempts.
- No instances of filter fracture, migration, or clinically significant extravascular strut penetration were reported.
- Initial retrieval venograms showed clot in filter in 6.3% and caval occlusion in 4.2% of cases. Post-retrieval imaging in a subset revealed thrombus within the filter (8.9%) or caval thrombosis/occlusion/stenosis (8.9%).
Conclusions:
- The Denali inferior vena cava filter exhibits a high retrieval success rate and a favorable safety profile.
- Complications such as filter fracture, migration, and significant thrombus formation appear to be infrequent with this device.
- The Denali filter is a safe and effective option for IVC filtration with successful retrieval outcomes.
Abstract:
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.
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