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Nerve excitability test using fine needle electrodes.

T Kobayashi1, Y Kudo, M J Chow

  • 1Department of Otolaryngology, Central Hospital of Japanese National Railways, Tokyo.

Acta Oto-Laryngologica. Supplementum
|January 1, 1988
PubMed
Summary
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Needle electrode Nerve Excitability Testing (NET) is a well-tolerated, effective prognostic tool for pediatric palsy. Positive results after three days indicate a good prognosis, with high rates of recovery in Bell's palsy and Hunt's syndrome.

Area of Science:

  • Neurology
  • Electrophysiology
  • Pediatric Medicine

Background:

  • Nerve Excitability Testing (NET) is a diagnostic tool used in neurological assessments.
  • Conventional NET utilizes surface electrodes, but its efficacy, particularly in pediatric populations, requires further evaluation.
  • Needle electrode NET offers a potentially more sensitive and patient-friendly alternative.

Purpose of the Study:

  • To evaluate the efficacy and prognostic value of needle electrode Nerve Excitability Testing (NET) in children with facial palsy.
  • To compare the effectiveness of needle electrode NET with conventional surface electrode NET for prognostication.
  • To assess the recovery rates in pediatric patients with Bell's palsy and Hunt's syndrome using EMG.

Main Methods:

  • Nerve Excitability Testing (NET) was performed using needle electrodes in pediatric patients with facial palsy.

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  • The tolerance of the procedure in children was assessed.
  • Prognostic value was determined by correlating NET results (positive responses, threshold values) with recovery outcomes assessed by EMG.

    • Main Results:

    • Needle electrode NET is a simple, well-tolerated procedure in children.
    • It proved more effective for prognostication than conventional surface electrode NET.
    • Positive NET responses recorded after 3 days from palsy onset predicted a good prognosis, regardless of threshold value.
    • NET was positive in 90% of Bell's palsy cases and 73% of Hunt's syndrome cases.
    • Complete recovery, confirmed by EMG, was observed in all but one patient.

    Conclusions:

    • Needle electrode NET is a valuable and highly tolerated electrophysiological test for pediatric facial palsy.
    • The test provides reliable prognostic information, aiding in the prediction of recovery.
    • High recovery rates were observed in patients with Bell's palsy and Hunt's syndrome, particularly when assessed with needle electrode NET.