What is the purpose of assessing Palmar Arch patency?

Assessing Palmar Arch patency is primarily aimed at evaluating blood flow to the digital arteries before creating an arteriovenous (AV) fistula or shunt for hemodialysis. The Palmar Arch, which is formed by the connection of the radial and ulnar arteries, plays a crucial role in supplying blood to the fingers. Ensuring that this arch is patent is essential because a compromised arch could lead to inadequate blood supply to the fingers after the AV fistula is created, potentially causing ischemia or complications.

When planning for an AV fistula, it is critical to confirm that the Palmar Arch is functioning properly to ensure that there is sufficient collateral circulation in case one of the main arteries (radial or ulnar) is used for the shunt. If the Palmar Arch is obstructed or lacks proper patency, this could impact the success of the AV shunt and the well-being of the patient.

The other options focus on different aspects of vascular assessment that do not directly relate to the specific purpose of ensuring adequate blood flow to the digital arteries in the context of AV shunt placement. Therefore, option A is the most relevant and accurate in this case.