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Related Experiment Videos

The timed Allen test

R H Gelberman, J P Blasingame

    The Journal of Trauma
    |June 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    The Allen test accurately assesses hand revascularization by measuring radial and ulnar artery fill times. Consistent pressure is crucial for reliable results in vascular assessments.

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    Area of Science:

    • Vascular Surgery
    • Hand Surgery
    • Diagnostic Imaging

    Background:

    • The Allen test is a standard diagnostic procedure.
    • Assessing collateral circulation in the hand is vital before vascular procedures.
    • Standardization of the Allen test technique is needed for accuracy.

    Purpose of the Study:

    • To standardize a technique for timing hand revascularization using the Allen test.
    • To establish normal radial and ulnar artery fill times.
    • To determine the necessary digital pressure for accurate Allen test results.

    Main Methods:

    • Standardized the Allen test in 800 hands from 400 control subjects.
    • Timed radial and ulnar artery refill after occlusion.
    • Correlated test results with digital blood pressure measurements.

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  • Determined required digital occlusion pressure for reproducibility.

    • Main Results:

    • Average radial artery fill time was 2.4 ± 1.2 seconds; ulnar artery fill time was 2.3 ± 1.0 seconds.
    • 7% of ulnar arteries and 2% of radial arteries showed incomplete filling within 6 seconds.
    • 91% of hands demonstrated uniform, brisk refill.
    • Inadequate revascularization correlated with reduced digital blood pressure.

    Conclusions:

    • The standardized Allen test provides reproducible timing for hand revascularization.
    • Accurate occlusion requires at least 11 pounds of digital pressure to occlude both arteries.
    • The Allen test is a reliable method for assessing hand collateral circulation when performed correctly.