In an AV graft, which maneuver helps distinguish which anastomosis is arterial versus venous?

In an AV graft, which maneuver helps distinguish which anastomosis is arterial versus venous?

• A. Compress the graft in the middle and palpate each side
• B. Listen for bruit over each limb
• C. Check color changes
• D. Take blood pressure in the arm

Answer: (A)

The key idea is using palpation to map which limb of the graft is connected to the artery versus the vein. In an AV graft, the arterial side carries high-pressure, pulsatile flow, while the venous side has lower pressure and less pulsatile flow. By compressing the graft in the middle, you momentarily isolate flow to each limb and can palpate them separately. The limb that remains more pulsatile and generates a clear thrill points to the arterial anastomosis; the other limb, with softer, less pulsatile flow, corresponds to the venous anastomosis. This practical check helps identify which end is arterial. While listening for a bruit can indicate overall flow, it doesn’t reliably tell you which side is arterial. Taking a blood pressure in the arm isn’t a method for distinguishing the ends of the graft.

The key idea is using palpation to map which limb of the graft is connected to the artery versus the vein. In an AV graft, the arterial side carries high-pressure, pulsatile flow, while the venous side has lower pressure and less pulsatile flow. By compressing the graft in the middle, you momentarily isolate flow to each limb and can palpate them separately. The limb that remains more pulsatile and generates a clear thrill points to the arterial anastomosis; the other limb, with softer, less pulsatile flow, corresponds to the venous anastomosis. This practical check helps identify which end is arterial. While listening for a bruit can indicate overall flow, it doesn’t reliably tell you which side is arterial. Taking a blood pressure in the arm isn’t a method for distinguishing the ends of the graft.