Evaluation of the acoustic (stapedius) reflex test in children and adolescents with peripheral facial nerve palsy.
BACKGROUND
The stapedius nerve is one of the branches of the facial nerve in the temporal bone. It supplies the stapedius muscle, which is responsible for the attenuation reflex that protects the inner ear from loud noises. The stapedius (acoustic) reflex (SR) test is useful in identifying the site of facial nerve injury. The return of the SR (acoustic) to normal after an injury is a good prognostic factor in the treatment of facial nerve palsy.


OBJECTIVE
The aim of this study was to evaluate the effect of FNP on the SR (acoustic) response and determine the acoustic reflex threshold (ART) levels on the affected side.


METHODS
In this study, 70 patients, 3-7 years old, were screened. The study population consisted of 26 boys (37%) and 44 girls (63%). Follow-up tests were performed 3-18 months after the initial tests.


RESULTS
Most patients in the study population had a negative SR (acoustic) response on the affected side. In other patients, mean ART values were statistically higher on the affected side. There was no statistically significant relationship between a reflex response and the time from the onset of facial nerve palsy.


CONCLUSIONS
In the available literature, the SR (acoustic) testing is limited in determining whether or not the reflex is present without stimulus frequency or ART measurements. It is estimated that the reflex response is negative with ipsilateral stimulation on the affected side in 35-80% patients.


CONCLUSIONS
The SR (acoustic) is absent in most patients on the affected side. The ART value was statistically higher on the affected side. The SR (acoustic) response was statistically time independent.
The Provincial Children's Specialized Hospital, Department of Otolaryngology, Olsztyn, Poland. Electronic address: wkopala@onet.pl.
Wacław
W
Kopala
University Hospital, Department of Otolaryngology, Olsztyn, Poland.
Andrzej
A
Kukwa
D000158:Acoustic Impedance Tests; D002648:Child; D002675:Child, Preschool; D005158:Facial Paralysis / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D012022:Reflex, Acoustic / Q000502:physiology*; D013198:Stapedius / Q000503:physiopathology*
Children; Facial nerve palsy; Stapedius reflex