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Related Experiment Videos

Membrane properties in chronic inflammatory demyelinating polyneuropathy.

C Cappelen-Smith1, S Kuwabara, C S Lin

  • 1Prince of Wales Medical Research Institute, University of New South Wales, Australia.

Brain : a Journal of Neurology
|November 10, 2001
PubMed
Summary

Chronic inflammatory demyelinating polyneuropathy (CIDP) alters median nerve excitability, showing higher thresholds and altered strength-duration properties. These findings suggest complex axonal changes beyond simple demyelination in CIDP patients.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Chronic inflammatory demyelinating polyneuropathy (CIDP) is a neurological disorder affecting peripheral nerves.
  • Understanding nerve excitability changes in CIDP is crucial for diagnosis and treatment.

Purpose of the Study:

  • To compare median nerve excitability properties between CIDP patients and healthy controls.
  • To investigate the impact of CIDP on stimulus-response curves, strength-duration properties, recovery cycle, and threshold electrotonus.

Main Methods:

  • Threshold tracking electrophysiology was employed.
  • Median nerve excitability was assessed in 11 CIDP patients and 25 healthy controls.

Main Results:

  • CIDP patients exhibited significantly higher thresholds, reduced stimulus-response curve slopes, and greater threshold spread.

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  • The strength-duration time constant (tau(SD)) was shorter, and rheobase was higher in CIDP.
  • Reduced refractoriness and supernormality were observed in CIDP, with normal relatively refractory period duration.

    • Conclusions:

    • CIDP significantly alters median nerve axonal excitability, with changes not fully explained by demyelination alone.
    • Variable remyelination and inflammatory edema may contribute to the observed excitability alterations.
    • Threshold electrotonus suggests no consistent changes in accommodation properties related to internodal conductances.