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Related Experiment Videos

Structure-function relationships within peripheral nerves in diabetic neuropathy: the hydration hypothesis

R P Eaton1, C Qualls, J Bicknell

  • 1University of New Mexico School of Medicine, Department of Medicine, Albuquerque 87131, USA.

Diabetologia
|April 1, 1996
PubMed
Summary

Diabetic neuropathy involves endoneurial edema, increasing sural nerve hydration. This swelling sequentially impairs nerve function, leading to symptoms and examination findings in peripheral diabetic neuropathy.

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Area of Science:

  • Neurology
  • Diabetology
  • Biophysics

Background:

  • Diabetic neuropathy is a common complication of diabetes mellitus.
  • Endoneurial edema is hypothesized to play a role in its pathogenesis.
  • Quantitative relationships between nerve structure and function are not fully understood.

Purpose of the Study:

  • To quantitatively define the relationship between peripheral nerve structure (hydration) and function in diabetic neuropathy.
  • To investigate the role of endoneurial edema in the progression of diabetic neuropathy.

Main Methods:

  • Magnetic resonance spectroscopy (MRS) to measure sural nerve hydration.
  • Neurological function assessed using nerve conduction velocity (NCV-score), neuropathic symptoms (NS-score), and examination signs (NE-score).

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  • Comparison between diabetic subjects (symptomatic and asymptomatic) and non-diabetic controls.

    • Main Results:

    • Symptomatic diabetic subjects showed significantly elevated sural nerve hydration (30% +/- 6%) compared to controls (25% +/- 3%).
    • Asymptomatic diabetic subjects had intermediate hydration levels (28% +/- 5%).
    • A hyperhydration state (25% prevalence in asymptomatic group) correlated with early electrophysiological and examination changes preceding symptoms.

    Conclusions:

    • Endoneurial edema, indicated by increased nerve hydration, is a key factor in diabetic neuropathy.
    • Deterioration occurs sequentially: electrophysiological changes, then examination signs, and finally symptomatic neuropathy.
    • These findings support endoneurial edema as an initiating factor in the development of peripheral diabetic neuropathy.