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Nerve membrane excitability testing.

W J Z'Graggen¹, H Bostock

¹University of Bern, Department of Neurology, Inselspital, Bern, Switzerland. werner.zgraggen@insel.ch

European Journal of Anaesthesiology. Supplement

|April 17, 2008

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Nerve excitability testing reveals peripheral nerves in critical illness polyneuropathy are depolarized, likely due to endoneurial hyperkalemia or hypoxia. This finding offers insights into disease mechanisms beyond standard nerve conduction studies.

Area of Science:

Neuroscience
Clinical Electrophysiology

Background:

Routine motor nerve conduction studies offer limited insight into disease mechanisms.
Threshold tracking and nerve excitability testing are emerging techniques for studying large myelinated axons.
Nerve excitability testing non-invasively assesses peripheral nerve membrane electrical properties.

Purpose of the Study:

To investigate the pathophysiology of peripheral nerve disorders, specifically critical illness polyneuropathy.
To determine if peripheral nerves in critical illness polyneuropathy exhibit altered electrical properties.
To explore correlations between nerve membrane depolarization and serum factors.

Main Methods:

Utilized nerve excitability testing, a threshold tracking technique.
Assessed electrical properties of the nerve membrane at the stimulation site.

Related Experiment Videos

Correlated nerve excitability indices with serum potassium and bicarbonate levels.

Main Results:

Evidence of peripheral nerve depolarization in patients with critical illness polyneuropathy.
Depolarization correlates with serum factors, suggesting a link to endoneurial hyperkalemia and/or hypoxia.
Nerve excitability indices show significant relationships with serum potassium and bicarbonate.

Conclusions:

Peripheral nerve depolarization is a key feature of critical illness polyneuropathy.
Endoneurial hyperkalemia and/or hypoxia are likely contributors to this depolarization.
Factors beyond potassium and acid-base balance appear to play a minor role in the observed depolarization.