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Related Experiment Videos

Non-invasive tests of neurovascular function.

R A Westerman1, R E Widdop, J Hannaford

  • 1Department of Physiology, Monash University, Clayton, Vic.

Clinical and Experimental Neurology
|January 1, 1987
PubMed
Summary

Non-invasive neurovascular tests reveal reduced nerve function in diabetic neuropathy patients. Impaired axon reflex vasodilatation and acetylcholine responses indicate potential links to diabetes complications.

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Area of Science:

  • Neuroscience
  • Vascular Biology
  • Diabetology

Background:

  • Diabetes mellitus can lead to neuropathy, affecting nerve function.
  • Neurovascular function assessment is crucial for understanding disease complications.
  • Non-invasive tests offer a valuable clinical approach to evaluate nerve health.

Purpose of the Study:

  • To evaluate the utility of non-invasive neurovascular function tests in a clinical setting.
  • To compare neurovascular responses between healthy volunteers and diabetic neuropathy patients.
  • To investigate the mechanisms of impaired vasodilatation in diabetic neuropathy.

Main Methods:

  • Utilized transcutaneous electrical nerve stimulation (TENS) to evoke axon reflex vasodilatation.
  • Employed laser Doppler flowmetry to measure blood flow changes.

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  • Used iontophoresis of acetylcholine and sodium nitrite (NaNO2) to assess endothelium-dependent and -independent vasodilation.

    • Main Results:

    • Diabetic neuropathy patients exhibited reduced axon reflex flare responses compared to healthy controls.
    • Responses were absent in denervated skin regions, confirming nerve dependency.
    • Acetylcholine-induced vasodilation was depressed in diabetic neuropathy patients, while NaNO2 responses were unaffected.

    Conclusions:

    • Non-invasive neurovascular testing effectively differentiates diabetic neuropathy patients from healthy individuals.
    • Impaired endothelium-dependent vasodilation and axon reflex responses are characteristic of diabetic neuropathy.
    • These functional deficits may contribute to the pathogenesis of diabetic symptoms and complications.