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KMID : 0361020010440020129
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Korean Journal of Otolaryngology - Head and Neck Surgery
2001 Volume.44 No. 2 p.129 ~ p.133
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Characteristics of waveforms of facial electroneurography(ENoG) according to different electrode placement in normal persons
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정용수/Yong soo Jung
정원호/이종찬/하병석/신동봉/원은영/조양선/홍성화/Won Ho Chung/Jong Chan Lee/Byung Suk Ha/Dong Bong Shin/Eun Young Won/Yang Sun Cho/Sung Hwa Hong
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Abstract
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Background and Objectives: Electroneurography(ENoG) is regarded as a useful test for evaluating the degree of facial nerve degeneration and predicting the prognosis of the patients with facial nerve palsy. The test results could be changed by
many
factors, such as electrode position, skin resistance and stimulus magnitude, etc. In this study, the waveforms of ENoG in normal persons were evaluated according to different electrode placement in the nasal alae and in the nasolabial fold,
respectively. Materials and Methods: Twenty volunteers with normal facial function were included in this study. ENoG was recorded with the recording electrode placed in two different locations, one in the nasolabial fold and the other in the
nasal
alae, in each person. The recording waves were compared according to their amplitude, sharpness and types of waveform. Interside variability was compared. Results: The amplitude was not significantly different at two locations, but the sharpness
was
significantly increased when recorded at the nasal alae. Biphasic waveform was more common when recorded at the nasal alae than at the nasolabial fold. This meant that the masseter artifacts were present more commonly at the nasolabial fold. The
average
of interside variability was 22.77% (17.62) at the nasolabial fold and 23.71% (15.35) at the nasal alae (p>0.05). Conclusion: Different electrode placement resulted in different waveforms. By placing the recording electrode at the nasal alae,
more
biphasic and sharpened waveforms were recorded and less masseter artifacts were observed.
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