Complex retrieval of embedded IVC filters: alternative techniques and histologic tissue analysis

Area of Science:

• Vascular Surgery
• Interventional Radiology
• Medical Device Retrieval

Background:

• Inferior vena cava (IVC) filters are used to prevent pulmonary embolism.
• Long-term implantation can lead to complications like filter embedding and tissue ingrowth.
• Retrieval of embedded filters presents significant technical challenges.

Purpose of the Study:

• To evaluate the safety and effectiveness of alternative endovascular methods for retrieving embedded IVC filters.
• To manage or reduce the risk of long-term complications associated with filter implantation.
• To analyze the pathologic effects of chronic filter implantation through histologic examination.

Main Methods:

• A prospective study of 10 consecutive patients undergoing retrieval of embedded IVC filters over 12 months.
• Indications for retrieval included symptomatic occlusion, perforation, filter-related thrombus, and risk mitigation.
• Histologic analysis of retrieved filter specimens was performed.

Main Results:

• Successful retrieval was achieved in all 10 patients, with no procedural complications or adverse events.
• Filters retrieved had been implanted for durations ranging from 124 to 1,495 days.
• Histology showed neointimal hyperplasia and dense fibrosis surrounding the filters, with evidence of photothermal ablation in laser-treated specimens.

Conclusions:

• Complex endovascular techniques enable safe retrieval of previously irretrievable embedded IVC filters in select patients.
• Neointimal hyperplasia and dense fibrosis are key factors influencing the success of chronic filter implant retrieval.
• These advanced methods offer solutions for managing complications of long-term IVC filter use.