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Chronic cryptogenic polyneuropathy. The search for a cause.

J Fagius

    Acta Neurologica Scandinavica
    |March 1, 1983
    PubMed
    Summary

    Determining the cause of chronic polyneuropathy is challenging, with investigations revealing a cause in only 9% of patients. Limited diagnostic workups are recommended for idiopathic cases due to low treatment success rates.

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    Area of Science:

    • Neurology
    • Clinical Medicine
    • Medical Diagnostics

    Background:

    • Chronic polyneuropathy presents a diagnostic challenge, particularly when no underlying disorder is initially apparent.
    • Idiopathic polyneuropathy affects a significant number of patients, often leading to prolonged and extensive investigations.
    • Current diagnostic approaches yield a definitive cause in a minority of cases.

    Purpose of the Study:

    • To investigate the diagnostic yield of extensive clinical and laboratory investigations in patients with chronic polyneuropathy of unknown origin.
    • To determine the frequency of identifiable causes and the potential for effective treatment in such cases.
    • To evaluate the association between polyneuropathy and subclinical glucose metabolism disturbances.

    Main Methods:

    • Retrospective analysis of 91 patients with chronic polyneuropathy without a known underlying disorder.
    • Comprehensive clinical assessments and extensive laboratory investigations were performed.
    • Statistical analysis to determine the proportion of cases with identified causes and treatment efficacy.

    Main Results:

    • A definite or probable cause for polyneuropathy was identified in only 9% of patients (8/91).
    • A possible but questionable cause was found in 17% (16/91), leaving 74% undetermined.
    • Effective treatment was initiated in only one patient.
    • No association was found between polyneuropathy and reduced glucose tolerance without diabetes mellitus.

    Conclusions:

    • Extensive investigations for chronic polyneuropathy without an obvious cause have a low diagnostic yield.
    • A limited diagnostic approach is often justified in idiopathic polyneuropathy given the low rate of identified causes and effective treatments.
    • Further research may be needed to explore novel diagnostic markers for polyneuropathy.

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