Facial nerve electroneurography. Variability in normal subjects.

J L de Medeiros; J A Nobrega; L A de Andrade; Y Juliano

doi:10.1590/s0004-282x1996000300005

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Facial nerve electroneurography. Variability in normal subjects.

J L de Medeiros·J A Nobrega·L A de Andrade·Y Juliano

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Abstract

Twenty normal individuals were submitted to facial nerve electroneurography using different techniques in order to determine the most accurate to obtain the latencies and amplitudes of the compound muscle action potentials (CMAP) of the facial muscles. First of all it was determined in which muscle or muscle group highest amplitude CMAP could be recorded with the lowest variability between sides and in test-retest. Different techniques were studied in order to determine which could give the best results. This was shown to be an arrangement of bipolar surface electrodes fixed to a plastic bar. The records with higher amplitude where obtained from the nasolabial fold muscles. Therefore 65 normal volunteers were examined using this technique and recording the potentials obtained over the nasolabial fold muscles. Normal values were determined (latency lower than 4.5 ms and amplitude larger than 2 mV--95% confidence limits).

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Action Potentials Adolescent Adult Aged Analysis of Variance Electromyography Electrophysiology Facial Muscles Facial Nerve Female Humans Male Middle Aged Comparative Study Journal Article

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J L de Medeiros, J A Nobrega, L A de Andrade, Y Juliano. 1996. Facial nerve electroneurography. Variability in normal subjects.. https://doi.org/10.1590/s0004-282x1996000300005

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