[Changes in otoacoustic emissions with simultaneous acoustic stimulation of the contralateral ear in normal probands and patients with unilateral acoustic neurinoma].
Contralateral white noise alters the amplitude of transitory evoked otoacoustic emissions (TEOAE). 27 students between 20 and 28 years of age with no history of ear disease or dizziness were tested for normal hearing by pure tone audiogram. OAE evoked by nonlinear stimuli were measured with and without contralateral stimulation by 40, 50 and 60 dB white noise. The contralateral stimulation resulted in a statistically significant diminution of the amplitude of the TEOAE under contralateral acoustic stimulation. This diminution is probably caused by the effect of the crossed bundle of the efferent innervation on the outer hair cells resulting in altered vibratory properties of the basilar membrane. In patients with unilateral acoustic neuroma and measurable TEOAE a diminution of the amplitude of the TEOAE under contralateral sound stimulation was not found. The testing can easily be performed with the routine measurement of TEOAE. It could be useful in the diagnostic of lesions of the cerebello pontine angle and the brain stem.
Maurer
J
J
Universitäts-HNO-Klinik Mainz.
Beck
A
A
Mann
W
W
Mintert
R
R
D000161:Acoustic Stimulation; D000328:Adult; D001301:Audiometry, Pure-Tone; D003055:Cochlear Microphonic Potentials / Q000502:physiology*; D004007:Dichotic Listening Tests; D004292:Dominance, Cerebral / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009464:Neuroma, Acoustic / Q000503:physiopathology*; D012016:Reference Values
Veränderungen otoakustischer Emissionen unter gleichzeitiger Beschallung des Gegenohres bei Normalpersonen und bei Patienten mit einseitigem Akustikusneurinom.