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Reversible diabetic nerve dysfunction: structural correlates to electrophysiological abnormalities.

A A Sima, T Brismar

    Annals of Neurology
    |July 1, 1985
    PubMed
    Summary
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    Diabetic polyneuropathy in rats shows early axonal swelling and later myelin damage. Insulin therapy reversed early nerve damage but not chronic changes, impacting nerve conduction.

    Area of Science:

    • Neuroscience
    • Diabetology
    • Pathology

    Background:

    • Diabetic polyneuropathy is a common complication of diabetes.
    • Nerve structure and function are affected in diabetes, but mechanisms remain unclear.

    Purpose of the Study:

    • To investigate structural alterations in the nodal and paranodal areas of the posterior tibial nerve in diabetic rats.
    • To correlate these structural changes with electrophysiological defects and the effects of insulin therapy.

    Main Methods:

    • Examination of the posterior tibial nerve in insulin-depleted and insulin-treated diabetic BB rats.
    • Analysis of structural changes in nodal and paranodal regions.
    • Correlation of structural findings with nerve conduction studies.

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    Main Results:

    • Early diabetic neuropathy featured paranodal axonal swellings and nodal bulgings, linked to sodium accumulation and impaired nerve conduction.
    • Vigorous insulin therapy fully normalized both structural and electrophysiological abnormalities in the early phase.
    • Chronic neuropathy showed loss of axoglial junctions and myelin retraction, contributing to irreversible nerve conduction deficits.

    Conclusions:

    • Early diabetic polyneuropathy involves reversible structural and functional nerve damage.
    • Chronic changes, including myelin retraction, lead to persistent nerve conduction defects.
    • Insulin therapy is effective in reversing early-stage diabetic nerve damage.