Long-term evaluation of composite sequential bypass for limb-threatening ischemia

Area of Science:

• Vascular Surgery
• Reconstructive Surgery
• Biomaterials in Medicine

Background:

• Autogenous vein grafts are preferred for femorotibial bypass, but availability can be limited.
• Composite sequential grafting, combining vein and polytetrafluoroethylene (PTFE), presents an alternative when sufficient autogenous material is unavailable.

Purpose of the Study:

• To review the largest collection of composite sequential grafts to date.
• To analyze the technical aspects and long-term patency characteristics of these grafts.
• To evaluate limb salvage rates and patient survival associated with this reconstructive technique.

Main Methods:

• A retrospective review of 67 composite sequential bypasses performed over a 7-year period.
• Grafts consisted of 6 mm PTFE from femoral to popliteal artery, extended with greater or lesser saphenous vein to tibial or peroneal arteries.
• Patient data included indications for surgery, demographics, anticoagulation status, and follow-up assessments using Doppler pressure and waveform analysis.

Main Results:

• Mean follow-up was 33 months; 3-year patient survival was 72%.
• Cumulative primary patency rates were 72% at 1 year, 64% at 2 years, and 48% at 3 years.
• Above-knee popliteal anastomoses showed significantly better 2-year patency (72%) compared to below-knee (46%). Limb salvage was 84% at 2 years and 70% at 4 years.

Conclusions:

• Composite sequential grafting is a valuable option for femorotibial bypass when autogenous vein is insufficient.
• The technique provides acceptable long-term patency and limb salvage, with above-knee popliteal anastomoses being preferable.
• This method may be superior to all-prosthetic tibial bypass when feasible.