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The effect of vein diameter on patency of in situ grafts
J B Towne1, D D Schmitt, G R Seabrook
1Department of Vascular Surgery, Medical College of Wisconsin, Milwaukee.
Insights
Vein diameter impacts early patency in lower limb bypasses, with conduits <3mm showing higher occlusion rates initially. However, vein diameter does not affect long-term durability after the perioperative period.
Area of Science:
- Vascular Surgery
- Biomedical Engineering
- Clinical Research
Background:
- In situ lower limb bypass grafts are crucial for limb salvage.
- Understanding factors influencing graft patency and durability is essential for surgical success.
- Vein diameter is a potential determinant of graft performance.
Purpose of the Study:
- To evaluate the impact of vein diameter on early patency and long-term durability of in situ lower limb bypasses.
- To determine optimal vein diameter thresholds for successful bypass construction.
- To assess the relationship between conduit size and graft failure rates.
Main Methods:
- Retrospective analysis of 195 in situ lower limb bypasses in 189 patients.
- Measurement of vein diameter from operative angiograms (nearest 0.5 mm).
- Postoperative follow-up included physical examination, graft flow velocity, and ankle-brachial indices every three months.
Main Results:
- Conduits less than 3 mm exhibited a higher occlusion rate within the first 30 days post-surgery.
- No conduits smaller than 2 mm could be successfully utilized due to difficulties in valve incision.
- After the perioperative interval, conduit diameter did not influence the long-term durability of the bypass grafts.
Conclusions:
- While smaller vein diameters (<3 mm) are associated with increased early occlusion risk, they do not compromise long-term outcomes.
- Conduit diameter is not a significant predictor of long-term durability for in situ lower limb bypasses beyond the initial healing phase.
- Surgical technique and patient factors may be more critical for long-term graft success than initial vein diameter.
Abstract:
In an attempt to evaluate the effect of vein diameter on early patency and long-term durability of in situ lower limb bypasses, we evaluated 195 femoral-distal, popliteal, and/or tibial bypasses constructed in 189 patients (153 men, 36 women), consisting of tibial bypasses in 116 (60%), and popliteal in 79 (40%). The operative angiograms were reviewed and the vein diameter was measured to the nearest 0.5 mm. Postoperative follow-up consisted of visits every three months where graft patency was assessed by physical examination and measurement of graft flow velocity and ankle-brachial indices. Conduits less than 3 mm had a higher rate of occlusion in the 0-30 day interval, but following that period performed satisfactorily. No conduit less than 2 mm was successfully utilized, because of inability to incise valves without injury in these tiny conduits. Following the perioperative period, conduit diameter does not affect the long-term durability of in situ bypass grafts.