[Evaluation of diagnostic sensitivity of electroneurography for facial neurotmesis].
OBJECTIVE
To evaluate diagnostic sensitivity of electroneurography (ENoG) for facial neurotmesis.


METHODS
The data of 24 patients suffering from facial neurotmesis on one side, having non-emergency operation, and having preoperative records of ENoG were collected. Among the patients, 18 were men and 6 were women, aged from 3 to 55 years (median 28). The duration of injury before ENoG examination was from 1 to 56 days (mean 23.6 days) for them. The electroneurographic examination was carried out for facial nerves on both sides preoperatively. Percentages of evoked potential amplitude reduction on affected sides were calculated according to the value of normal side. The 90% reduction of amplitude was used as a cutting point. The facial neurotmesis was observed during operation. The sensitivity and false negative proportions of ENoG were analyzed.


RESULTS
Among the 24 patients with facial neurotmesis, 22 had ENoG amplitude reduction over 90%, and 2 having this reduction less than 90%. The sensitivity and false negative proportions of ENoG in patients with facial neurotmesis were 91.7% and 8.3% respectively.


CONCLUSIONS
The preoperative ENoG examination is high sensitivity for facial neurotmesis. The patients whose ENoG reduction over 90% should be advised to have a facial neurorrhaphy as soon as possible.
Yang
Zhao Hui
ZH
Laboratory of Oral Masticatory Physiology, Peking University School & Hospital of Stomatology, Beijing, China.
Peng
Xin
X
Xie
Qiu Fei
QF
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004568:Electrodiagnosis / Q000379:methods; D005071:Evoked Potentials; D005154:Facial Nerve / Q000503:physiopathology*; D020220:Facial Nerve Injuries / Q000175:diagnosis* / Q000503:physiopathology; D005158:Facial Paralysis / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D055815:Young Adult