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Sural nerve biopsy may predict future nerve dysfunction.

S Thrainsdottir1, R A Malik, I Rosén

  • 1Department of Clinical Sciences and Neurology, Lund University, Lund, Sweden. soleyth@landspitali.is

Acta Neurologica Scandinavica
|January 22, 2009
PubMed
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Reduced myelinated nerve fiber density (MNFD) in sural nerve biopsies predicts worsening nerve dysfunction over time. This study links obesity to nerve fiber loss in individuals with varying glucose tolerance.

Area of Science:

  • Neurology
  • Diabetology
  • Pathology

Background:

  • Peripheral neuropathy is a common complication of diabetes.
  • Sural nerve pathology correlates with clinical and neurophysiological findings.
  • Understanding the progression of nerve dysfunction is crucial for patient management.

Purpose of the Study:

  • To investigate the progression of sural nerve dysfunction over time.
  • To correlate nerve dysfunction progression with baseline nerve biopsy findings.
  • To explore the relationship between glucose tolerance, obesity, and nerve pathology.

Main Methods:

  • Assessed baseline myelinated nerve fiber density (MNFD) in sural nerve biopsies.
  • Included men with type 2 diabetes, impaired glucose tolerance, and normal glucose tolerance.

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  • Estimated nerve conduction and quantitative perception thresholds at baseline and 7-10 year follow-up.

    • Main Results:

    • Low MNFD (< or = 4700 fibers/mm(2)) predicted declines in peroneal and median nerve conduction (amplitude and velocity).
    • Diabetes significantly influenced the decline in nerve conduction over time.
    • MNFD showed a negative correlation with body mass index, suggesting a link between obesity and nerve fiber loss.

    Conclusions:

    • Low MNFD is a potential predictor of progressive neurophysiological dysfunction.
    • Obesity is linked to a loss of myelinated nerve fibers.
    • These findings highlight the importance of metabolic control in preventing diabetic neuropathy progression.