Facial nerve electroneurography: variability in normal subjects

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).

Bibliographic Details

Main Authors:	Medeiros,Jovany Luis Alves de, Nobrega,João Antonio Maciel, Andrade,Luiz Augusto Franco de, Juliano,Yara
Format:	Digital revista
Language:	English
Published:	Academia Brasileira de Neurologia - ABNEURO 1996
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X1996000300005
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