P.12 Allen test，共筆敘述直接摘取老師的口述，不過有點問題
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Allen test
1.Patient elevates hand and makes a fist for 20 seconds
2.Firm pressure held against radial and ulnar arteries
3.Patient opens hand and should blanche white
4.Examiner releases only ulnar compression
Normal Result
Hand color flushes within 5 to 7 seconds
Abnormal result: Inadequate collateral circulation
Hand remains white until radial pressure released
Risk of serious hand ischemia if radial vessel spasm
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