*NURSING > EXAM > HEALTH ASSESMENT 2 REVIEW EXAM 1 GRADED A+ (Chapter 21, 22,23,24) YR 2023/2024NR 304 (All)
HEALTH ASSESMENT 2 REVIEW EXAM 1 GRADED A+ (Chapter 21, 22,23,24) YR 2023/2024NR 304
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Allen’s Test – Modified Allen Test The modified Allen test is used to evaluate the adequacy of collateral circulation before cannula ting the radial artery A, firmly occlude both the ulnar and... radial arteries of one hand while the person makes a fist several times. This causes the hand to blanch. B, ask the person to open the hand without hyperextending it; then release pressure on the ulnar artery while maintaining pressure on the radial artery. Adequate circulation is suggested by a palmar blush, a return to the normal color of the hand in less than 7 seconds. Although this test is simple and useful, it is relatively crude and subject to error (i.e., you must occlude both arteries uniformly with 11 pounds of pressure for the test to be accurate). C, Pallor that persists or a sluggish return to color suggests occlusion of the collateral arterial flow. An equivocal result is 8 to 14 seconds; ≥15 seconds is a negative result. Avoid radial artery cannulation until adequate circulation is shown. [Show More]
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