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.

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