Distortion Product Otoacoustic Emissions (DPOAEs) are acoustic signals that can be detected in the ear canal of a person with normal outer hair cell function, subsequent to stimulation of the auditory system with a pair of pure tones.
Transient Evoked Otoacoustic Emissions (TEOAEs) are acoustic signals that can be detected in the ear canal of a person with normal outer hair cell function, subsequent to stimulation of the auditory system with a series of wideband clicks.
Available evidence suggests that otoacoustic emissions (OAEs) are generated by the cochlea’s outer hair cells, and that the presence of OAEs is an indication that the outer hair cells are normal. Although OAE test data provide no indication of inner hair cell function, or of hearing ability, current research indicates that the majority of hearing-impaired individuals will be identified by a simple OAE test. Patients who fail to generate OAEs should be rescreened and/or referred for additional audiological testing.
Otoscopic examination of the patient’s ear canal should be performed prior to testing. Excessive cerumen or vernix in the ear canal may interfere with the test and give invalid or incomplete results. Patients with excessive cerumen, debris, or foreign bodies in the ear canal should be referred to an audiologist or physician for removal of the blockage prior to testing. Place the patient in a position that will allow the OtoRead™ to be held steady while testing is in progress. The patient should remain still and quiet while the test is performed.
When testing a newborn or infant with the OtoRead™ instrument, the following suggestions might be helpful: