Expanded microporous polytetrafluoroethylene as a vascular substitute: a two year follow-up

Area of Science:

• Vascular Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Femoropopliteal, distal popliteal, and tibial bypasses are critical for limb salvage.
• Expanded microporous polytetrafluoroethylene (PTFE) has been utilized as a synthetic vascular graft material.
• Assessing the long-term efficacy of PTFE in complex arterial reconstructions is essential.

Purpose of the Study:

• To evaluate the patency rates and clinical outcomes of expanded microporous PTFE grafts in femoropopliteal, distal popliteal, and tibial bypasses.
• To compare the performance of PTFE grafts with alternative conduits and autogenous saphenous vein.
• To assess the biological integration and suitability of PTFE as an arterial substitute.

Main Methods:

• A retrospective analysis of 131 femoropopliteal, distal popliteal, and tibial bypasses performed using expanded microporous PTFE since 1974.
• Inclusion of 40 patients undergoing surgery for limb salvage, with 21 having prior bypass procedures.
• Assessment of graft patency rates, occlusion causes, and cumulative patency over time.

Main Results:

• An overall patency rate of 82% was achieved.
• A cumulative patency rate of 75.7% was observed at 28 months.
• PTFE grafts demonstrated fibroblastic ingrowth and a smooth intimal lining, with patency rates superior to alternative conduits and approaching those of autogenous saphenous vein.

Conclusions:

• Expanded microporous PTFE is an excellent arterial substitute for femoropopliteal, distal popliteal, and tibial bypasses, offering high patency, pliability, and tissue incorporation.
• The excellent results in a high-risk patient population suggest PTFE's significant role in limb salvage surgery.
• Further studies with uniform patient selection are needed for more equitable comparisons between expanded PTFE and autogenous vein grafts.