[The clinical significance of analysis of frequency domain of transient-evoked otoacoustic emissions].
OBJECTIVE
To determine the clinical value of analysis of frequency domain of transient-evoked otoacoustic emissions (TEOAE).


METHODS
Frequency domain of TEOAE were measured in 1. normal functional ears; 2. noise exposure ears; 3. Meniere's ears; 4. pathologic ears of media ear; 5. contralateral suppression of normal ears.


RESULTS
1. After exposure to noise, the value of band signal/noise ratio were decreased in certain frequency band, main frequency of FFT response were changed in frequency spectrum. 2. In the ears of Meniere's disease, after the administration of glycerol, the value of band signal/noise ratio were increased in certain frequency band, no TEOAE were elicited before the administration of glycerol, but they appeared after glycerol administration in some ears, main frequency were changed in frequency spectrum, 3. In the pathologic ears of media ears. The value of band signal/noise ratio decreased to different extent with different kind of pathologic changes, which is related to the change of acoustic immittance. Besides. Acoustic immittance were normal in those with mild pathologic change in the tympanic membrane. The value were decreased in band signal/noise ratio. 4. After contralateral suppression of normal ears, 1 kHz and 2 kHz band signal/noise ratio value were decreased.


CONCLUSIONS
Frequency domain of TEOAE is a sensitive parameter and has property of frequency specificity. It is of great help to study the function of outer hair cells farther and make a differential diagnose in the clinical practice.
Zhong
N C
NC
Department of Otolaryngology, Union Hospital, Tongji Medical University, Wuhan 430022.
D004427:Ear Diseases / Q000175:diagnosis*; D018072:Hair Cells, Auditory, Outer / Q000502:physiology; D006801:Humans; D008575:Meniere Disease / Q000175:diagnosis*; D009622:Noise; D017084:Otoacoustic Emissions, Spontaneous