Vascular Disease Bypass: Restoring Blood Flow and Saving Limbs
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Editorial note: This article is provided for educational purposes only. It is not medical advice. Always consult a qualified healthcare professional for diagnosis and treatment of any condition.
Quick Answer
Vascular disease bypass is surgery that restores circulation by rerouting blood around a blocked section of an artery. The surgeon uses a graft, which is either a healthy vein from the person's own body or a synthetic material [1]. It is used for severe blockages in the arteries to the lower limbs, such as critical limb ischemia caused by peripheral artery disease (PAD), to keep limb tissue alive and avoid amputation [1].
What the research says
Surgery beat endovascular treatment when a good leg vein was available. In the BEST-CLI trial of 1,830 people with chronic limb-threatening ischemia, among those with a usable great saphenous vein, a major limb event or death occurred in 42.6% of the surgery group versus 57.4% of the endovascular group (hazard ratio 0.68; 95% CI 0.59-0.79). When another conduit was needed, outcomes were similar (42.8% vs 47.7%; hazard ratio 0.79; 95% CI 0.58-1.06) (Farber et al., The New England Journal of Medicine, 2022 [2]).
Your own vein lasts longer than a synthetic graft. A systematic review of 25 studies of above-knee femoropopliteal bypass found 5-year primary patency of 69% with saphenous vein versus 49% with PTFE grafts (74% vs 39% in randomized trials only) (Klinkert et al., European Journal of Vascular and Endovascular Surgery, 2004 [3]).
Smoking triples the risk of graft failure. In a meta-analysis of 29 studies, continued smoking after lower limb bypass raised the risk of graft failure about threefold (3.09-fold; 95% CI 2.34-4.08). Quitting, even after the operation, moved graft patency back toward that of never-smokers (Willigendael et al., Journal of Vascular Surgery, 2005 [4]).
Key takeaways
Vascular bypass reroutes blood around severely blocked arteries using a vein from your own body or a synthetic graft [1].
It is mainly used for critical limb ischemia and severe peripheral artery disease, to keep limb tissue alive and prevent amputation [1].
Bypass does not cure the underlying disease. Long-term success depends on follow-up and lifestyle changes, especially quitting tobacco [1] [4].
What is vascular bypass and who is it for?
Vascular disease often shows up as severe blockages in the arteries to the lower limbs and the abdominal area. When blood flow is badly reduced, it can cause limb pain and wounds, and put the limb at risk [1]. Bypass surgery makes a detour for the blood, so oxygen-rich blood reaches the tissue that needs it.
Vascular bypass is for people with severe blockages in the arteries to their lower extremities, including the abdominal aorta. These severe blockages are known as critical limb ischemia, which results from peripheral artery disease (PAD) [1].
What are the common types of bypass procedures?
Bypass procedures are named for the artery being bypassed and the arteries that receive the rerouted blood. Each type is tailored to your vascular anatomy and the severity of the disease [1].
Procedure | Starting point | Connection point | Typical shape |
Aortobifemoral bypass | Lower abdominal aorta, just above the pelvis | Upper femoral artery in each leg | Upside-down Y |
Femoral-popliteal bypass | Femoral artery in the groin or upper leg | Popliteal artery above or below the knee | Linear or curved |
Femoral-tibial bypass | Femoral artery in the groin or upper leg | Tibial arteries below the knee | Linear or curved |
Source: Cleveland Clinic [1].
How is bypass surgery planned and done?
Before surgery, tests such as the ankle-brachial index (ABI) and a vascular ultrasound assess the disease, show which arteries need treatment and help plan the bypass. Because people with limb vascular disease often have heart disease too, your provider may also check your heart [1].
The operation is done in a hospital under general anesthesia. The surgeon makes incisions to reach the arteries and veins, hand-sews the bypass in place with tiny stitches and closes the incisions. It generally takes two to six hours, depending on the type of bypass [1].
Which graft is used: your own vein or a synthetic one?
Providers often use the saphenous vein, which lies just under the skin of the leg. Other options include arm veins such as the cephalic vein, or the femoral vein in the thigh if a larger vein is needed. If your own veins cannot be used, the surgeon uses a synthetic material [1].
Graft type | Source | Best use | Durability |
Autologous vein | Saphenous, cephalic or femoral vein from your own body | Smaller vessel bypasses | Better long-term patency than synthetic grafts in studies of above-knee bypass [3] |
Synthetic material | Human-made biocompatible fabric | Larger artery bypasses, or when your veins cannot be used | Works well for larger vessels |
What are the risks and possible complications?
As with any major surgery, complications can happen during the procedure, during recovery or even years later. People with other medical issues, such as heart disease, kidney failure or diabetes, are more likely to have them [1]. Possible problems include:
What is recovery and the long-term outlook?
You can expect to stay in the hospital for a few days. You may take blood thinners to prevent clots in the graft. Your care team will expect you to get out of bed and walk, in the hospital and at home, and you may need extra help or physical or occupational therapy. You then gradually return to daily activities [1].
Limb salvage rates are high with successful bypass grafts. However, the surgery does not cure PAD, and grafts can narrow or block over time. Grafts are much more likely to fail in people who use tobacco, so quitting is essential, and regular follow-up with your vascular surgeon is needed to monitor the bypass [1] [4].
Contact your healthcare provider if you have leg pain, cold, pale or blue skin, numbness or tingling, or worsening wounds. Also call if you have fever, nausea and vomiting, redness and warmth at the incisions, or drainage such as pus [1].
Related reading: For more on the type of sedation used for this surgery, see our guide Anesthesia Essentials: A Guide to Types, Safety, and Recovery
Bottom line: what every reader should remember
Vascular bypass is a vital operation for people whose leg arteries are severely blocked. By rerouting blood flow it offers high limb salvage rates and can greatly improve quality of life. Its success depends on proactive care after surgery, including monitoring for problems and lifestyle changes such as quitting tobacco [1] [4].
Take action today: If you or a loved one is preparing for a vascular bypass, consider these steps [1]:
Consult your specialists: make sure a full heart evaluation is done before the procedure.
Plan for recovery: arrange help at home for the first days after you leave the hospital.
Commit to lifestyle changes: if you use tobacco, get help to quit now to protect your graft.
Watch for warning signs: report leg pain, cold or pale skin, numbness or wounds that are not healing right away.
Frequently Asked Questions
1. What is the primary goal of vascular bypass surgery?
The goal is to restore blood flow to the lower limb by creating a new pathway around a blocked artery, which keeps limb tissue alive and helps avoid amputation [1].
2. How long does the surgery usually take?
It generally takes two to six hours, depending on the type of bypass [1].
3. What is a graft in this surgery?
A graft is the segment of vein from your own body, or a synthetic material, that is used to create the new pathway for blood [1].
4. Where do surgeons get natural grafts?
They often use the saphenous vein just below the skin in the leg. Other options include arm veins such as the cephalic vein, or the femoral vein in the thigh if a larger vein is needed [1].
5. When are synthetic grafts used?
Providers use synthetic material when they cannot use your own veins. Synthetic grafts work well for larger arteries, while your own vein is best for smaller vessel bypasses [1].
6. Will I be awake during the procedure?
No. An anesthesiologist gives you general anesthesia so you are comfortable during the procedure [1].
7. How long is the typical hospital stay?
You can expect to stay in the hospital for a few days [1].
8. What tests are needed before surgery?
Tests may include an ankle-brachial index (ABI) and a vascular ultrasound to assess your vascular disease and plan the bypass [1].
9. Why is heart health checked before a vascular bypass?
People who have vascular disease in their limbs often have vascular disease in their hearts too, so providers may check your heart before the procedure [1].
10. Can I walk right after the surgery?
Your provider will expect you to get out of bed and walk around, both in the hospital and at home. You may need extra help, and some people need physical or occupational therapy [1].
11. Does bypass surgery cure peripheral artery disease?
No. The procedure does not cure peripheral artery disease (PAD), and grafts can narrow or block up over time, so ongoing monitoring is needed [1].
12. What is the biggest threat to the success of a bypass?
Tobacco use. Grafts are much more likely to fail in people who use tobacco [1]. A meta-analysis found that continuing to smoke after lower limb bypass raised the risk of graft failure threefold [4].
13. What are the signs of a failing graft?
Contact your provider if you have leg pain, cold, pale or blue skin, numbness or tingling, or wounds on your legs that are getting worse [1].
14. Are blood thinners necessary after the procedure?
You may be prescribed blood thinners (anticoagulants) to prevent blood clots from forming in the graft [1].
15. What are the common risks of the surgery?
Risks include graft failure, bleeding at the incisions, incision or graft infection, limb nerve damage with numbness or weakness, heart attack and pneumonia. People with heart disease, kidney failure or diabetes are more likely to have complications [1].
References
Cleveland Clinic. Vascular Disease Bypass: Procedure Details & Outlook. Cleveland Clinic. Last updated October 20, 2022. https://my.clevelandclinic.org/health/treatments/17611-venous-disease-bypass-surgery
Farber A, Menard MT, Conte MS, et al. Surgery or endovascular therapy for chronic limb-threatening ischemia. The New England Journal of Medicine. 2022;387:2305-2316. PMID: 36342173. https://doi.org/10.1056/NEJMoa2207899
Klinkert P, Post PN, Breslau PJ, et al. Saphenous vein versus PTFE for above-knee femoropopliteal bypass: a review of the literature. European Journal of Vascular and Endovascular Surgery. 2004;27(4):357-362. PMID: 15015183. https://doi.org/10.1016/j.ejvs.2003.12.027
Willigendael EM, Teijink JAW, Bartelink ML, et al. Smoking and the patency of lower extremity bypass grafts: a meta-analysis. Journal of Vascular Surgery. 2005;42(1):67-74. PMID: 16012454. https://doi.org/10.1016/j.jvs.2005.03.024
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