Which arm vein can be used as a conduit for arterial bypass grafts?

• A. Cephalic Vein
• B. Basilic Vein
• C. Subclavian Vein
• D. Axillary Vein

Answer: (D)

Vein grafts for arterial bypass in the upper limb rely on a vein with enough diameter, good walls, and enough length to bridge the blocked arterial segment. The axillary vein fits well because it is a large, central upper-extremity conduit that can be mobilized to provide a suitable graft from the axilla to the brachial or further distal arteries. Its size often makes it a more reliable conduit than smaller arm veins, and its central location offers a direct route for bypass in the arm. The cephalic and basilic veins are arm veins too, but they are typically smaller and may have valves or caliber limitations that complicate arterial bypass. The subclavian vein is a central venous structure not routinely used for grafts due to higher risks associated with central venous procedures. In this context, the axillary vein is the best match for an arterial bypass conduit in the arm.