[Study of the cochlea by evoked otoemissions. Physiological interpretation of results].
Amplitudes and detection thresholds of evoked otacoustic emissions (EOE) were measured in various groups of subjects: 44 normal young adults, 80 patients with presbycusis and 38 patients with acoustic trauma. Relations between these EOE parameters and tonal audiogram were analyzed. Surprisingly, EOE detection threshold at 1 kHz was strongly correlated with auditory threshold at 2 kHz and no other one. This result demonstrates that some EOE parameters are not frequency-specific. A simple model is implemented in which it is assumed that EOE amplitudes are proportional to the global cochlear activity. This model fits very well experimental data and allows a quantitative evaluation of the residual cochlea. The domain of validity of EOE test in clinics has therefore been precised.
Avan
P
P
PAM Neuro-Sensoriel, Service Central de Biophysique et de Médecine nucléaire, Hôpital Lariboisière, Paris.
Bonfils
P
P
Loth
D
D
Teyssou
M
M
Trotoux
J
J
Narcy
P
P
D001299:Audiometry; D001301:Audiometry, Pure-Tone; D003051:Cochlea / Q000503:physiopathology*; D015834:Cochlear Diseases / Q000175:diagnosis / Q000503:physiopathology*; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis / Q000503:physiopathology*; D006801:Humans; D011304:Presbycusis / Q000175:diagnosis / Q000503:physiopathology*
Exploration de la cochlée par les otoémissions provoquées. Interprétation physiologique des résultats.