OAEs (‘Otoacoustic emissions’) are weak sounds generated by the outer hair cells (OHCs) of the inner ear. They are measured by means of a sensitive microphone within a sound probe placed in the outer ear canal. Evoked OAEs are generated by either transient (clicks and tone bursts) or stationary stimuli (tones) delivered via loudspeakers within the sound probe. Transiently evoked OAEs (TEOAEs) represent the sum of the pulse responses of outer hair cells (OHCs) along the cochlea. TEOAEs disappear at a hearing loss higher than approx. 15 dB HL in case of a conductive hearing loss and approx. 30 dB HL in case of a cochlear hearing loss.
Before each OAE measurement calibration of the ear probe is automatically done. In cases where the sound probe is not inserted properly or sound probe ports are blocked a warning (“incomplete”) will appear.
In Sentiero, there are four different OAE modules are available. For TEOAE we offer TE Quick and TE Diagnostic.