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Related Experiment Videos

Nerve excitability testing: technical pitfalls and threshold norms using absolute values

G A Gates1

  • 1Department of Otolaryngology, Washington University School of Medicine, St. Louis, Mo.

The Laryngoscope
|April 1, 1993
PubMed
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Nerve excitability threshold (NET) testing for facial paralysis is influenced by age, gender, and weight. New statistical norms for NET provide more accurate interpretation of facial nerve function.

Area of Science:

  • Neurology
  • Electrophysiology

Background:

  • Percutaneous facial nerve stimulation is crucial for assessing facial paralysis severity and prognosis.
  • Established tests include nerve excitability threshold (NET), maximum stimulation test (MST), and electroneuronography (EnoG).
  • Accurate results depend on consistent technique and controlled variables.

Purpose of the Study:

  • To investigate variability sources in facial nerve excitability threshold (NET) testing.
  • To establish statistically derived normal values for facial NET in adults.
  • To enhance the predictive power of NET by integrating statistical and clinical significance.

Main Methods:

  • Facial NET was measured in 120 healthy adults.
  • Variability factors analyzed included age, gender, body weight, and electrode paste use.

Related Experiment Videos

  • Eyelid twitch was used as the endpoint for NET measurement.

    • Main Results:

    • Facial NET increased linearly with age and body weight.
    • Men exhibited higher NET than women, adjusted for age and weight.
    • Electrode paste use falsely elevated NET; established normal values are > or = 1.25 mA (upper) and > or = 2.0 mA (lower) division.

    Conclusions:

    • Age, gender, and body weight are significant factors influencing facial NET.
    • Statistically derived norms allow for continuous scale reporting of NET results, improving interpretation.
    • These norms are not applicable to patients with obesity, facial edema, or inflammation.