The saphenous vein used for coronary artery grafting must be reversed before anastomosis due to the presence of valves in the vein.

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The saphenous vein used for coronary artery grafting must be reversed (also known as "inverted") before anastomosis to prevent the entry of blood into the distal portion of the vein, which is usually accompanied by valves that impede blood flow. Reversing the vein allows for a continuous and unobstructed flow of blood from the aorta to the coronary artery graft.

The Saphenous Vein Used for Coronary Artery Grafting Must Be