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Purpose: The objectives of this study were to describe the venous valves and determine their fate over time in reversed saphenous vein (RSV) and in situ saphenous vein (ISV) bypass grafts with duplex ultrasonography. Methods: Sixty-four patients contributed 50 RSV and 19 ISV infrainguinal vein grafts. Forty-two of the RSVs and 17 of the ISVs had valves or valve remnants. The grafts and valves were...