Which test demonstrates complete vs incomplete palmar arch patency?

Which test demonstrates complete vs incomplete palmar arch patency?

• A. Allen's test
• B. Barrett's test
• C. Raynaud's test
• D. Prinzmetal test

Answer: (A)

The test is designed to assess whether the hand has complete collateral circulation through the palmar arch by evaluating patency of the radial and ulnar arteries. It is performed by occluding both arteries at the wrist, allowing the hand to blanch, then releasing one artery to see if color returns quickly. If the hand pinks promptly when a vessel is released, that vessel is patent and the palmar arch is complete, indicating adequate collateral flow. If color return is delayed or absent, this suggests an incomplete palmar arch or compromised arterial flow, meaning relying on a single artery could risk ischemia. Other choices don’t test this same vascular pattern. Barrett's test isn’t a standard tool for assessing hand arterial patency. Raynaud’s evaluation relates to vasospastic changes in the digits rather than the anatomical completeness of the palmar arch, and Prinzmetal refers to coronary vasospasm, not peripheral hand circulation.

The test is designed to assess whether the hand has complete collateral circulation through the palmar arch by evaluating patency of the radial and ulnar arteries. It is performed by occluding both arteries at the wrist, allowing the hand to blanch, then releasing one artery to see if color returns quickly. If the hand pinks promptly when a vessel is released, that vessel is patent and the palmar arch is complete, indicating adequate collateral flow. If color return is delayed or absent, this suggests an incomplete palmar arch or compromised arterial flow, meaning relying on a single artery could risk ischemia.

Other choices don’t test this same vascular pattern. Barrett's test isn’t a standard tool for assessing hand arterial patency. Raynaud’s evaluation relates to vasospastic changes in the digits rather than the anatomical completeness of the palmar arch, and Prinzmetal refers to coronary vasospasm, not peripheral hand circulation.