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Related Experiment Videos

Axillary F central latency: simple electrodiagnostic technique for proximal neuropathy.

Y Wu, J R Kunz, T D Putnam

    Archives of Physical Medicine and Rehabilitation
    |March 1, 1983
    PubMed
    Summary

    A new method accurately measures proximal nerve conduction time using Axillary F Central Latency (AFCL). This technique aids in diagnosing neuropathies and myelopathies by identifying prolonged AFCL values.

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    Area of Science:

    • Neurology
    • Neurophysiology
    • Clinical Electrophysiology

    Background:

    • Peripheral nerve conduction studies are crucial for diagnosing neurological disorders.
    • Assessing proximal nerve segments presents technical challenges.
    • F-wave analysis offers a potential method for evaluating nerve conduction.

    Observation:

    • A simple technique for measuring F-wave conduction time in proximal peripheral nerves is presented.
    • The method utilizes F-wave (Fw), wrist M response (Mw), and axillary M response (Ma) to calculate Axillary F Central Latency (AFCL).
    • AFCL represents the conduction time between the spinal cord and the axilla.

    Findings:

    • The formula AFCL = (Mw + Fw) - 2Ma was used.
    • In 30 normal subjects, the mean AFCL was 11.2 +/- 0.8 msec for ulnar or median nerves.

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  • An AFCL exceeding 13.6 msec (mean + 3SD) or a side-to-side discrepancy > 2.1 msec suggests proximal nerve segment abnormality.

    • Implications:

    • This technique can aid in diagnosing proximal neuropathies and myelopathies.
    • Prolonged AFCL was observed in patients with Guillain-Barré syndrome, brachial plexus lesions, syringomyelia, and thoracic outlet syndrome.
    • The AFCL measurement provides a valuable tool for clinical neurophysiology and neurological diagnostics.