Biomaterial Database

[Transitory evoked otoacoustic emissions and distortion product emissions in disorders of middle ear ventilation]. 1996

N Schmuziger, and R Hauser, and R Probst

Universitáats-HNO-Klinik, Kantonsspital Basel.

Both the amplitude and power spectra of otoacoustic emissions are affected by the transfer properties of the middle ear. This prospective study examined the influence of eustachian tube dysfunction on transiently evoked otoacoustic emissions (TEOAEs) and distortion-product otoacoustic emissions (DPOAEs). In all, 18 ears were studied that exhibited negative middle ear pressures with or without middle ear fluid. Measurements were performed at the time of diagnosis during the recovery stage, and after the middle ear became normally ventilated. Findings showed that TEOAE and DPOAE levels increased while airbone gaps were reduced by an average of 8 dB after negative middle ear pressures returned from -400 daPa to a normal state. There was a tendency for negative middle ear pressure to affect DPOAEs more in the 1-kHz region than in higher frequencies. By contrast, TEOAEs and airbone gaps were more uniformly affected across the entire frequency range. These results for ears with eustachian tube dysfunction were somewhat different from those results of studies obtained in healthy ears tested during experimental changes in middle ear pressure.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D008876	Middle Ear Ventilation	Ventilation of the middle ear in the treatment of secretory (serous) OTITIS MEDIA, usually by placement of tubes or grommets which pierce the TYMPANIC MEMBRANE.	Grommet Insertion,Tympanostomy Tube Insertion,Ventilation, Middle Ear,Myringostomy,Tympanostomy,Ear Ventilation, Middle,Ear Ventilations, Middle,Grommet Insertions,Insertion, Grommet,Insertion, Tympanostomy Tube,Insertions, Grommet,Insertions, Tympanostomy Tube,Middle Ear Ventilations,Myringostomies,Tube Insertion, Tympanostomy,Tube Insertions, Tympanostomy,Tympanostomies,Tympanostomy Tube Insertions,Ventilations, Middle Ear
D010034	Otitis Media with Effusion	Inflammation of the middle ear with a clear pale yellow-colored transudate.	Middle Ear Effusion,Otitis Media, Secretory,Otitis Media, Serous,Ear Effusion, Middle,Ear Effusions, Middle,Effusion, Middle Ear,Effusions, Middle Ear,Middle Ear Effusions,Secretory Otitis Media,Serous Otitis Media
D011446	Prospective Studies	Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.	Prospective Study,Studies, Prospective,Study, Prospective
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D002675	Child, Preschool	A child between the ages of 2 and 5.	Children, Preschool,Preschool Child,Preschool Children
D005064	Eustachian Tube	A narrow passageway that connects the upper part of the throat to the TYMPANIC CAVITY.	Auditory Tube,Pharyngotympanic Tube,Auditory Tubes,Eustachian Tubes,Pharyngotympanic Tubes,Tube, Auditory,Tube, Eustachian,Tube, Pharyngotympanic,Tubes, Auditory,Tubes, Eustachian,Tubes, Pharyngotympanic
D005260	Female		Females
D006314	Hearing Loss, Conductive	Hearing loss due to interference with the mechanical reception or amplification of sound to the COCHLEA. The interference is in the outer or middle ear involving the EAR CANAL; TYMPANIC MEMBRANE; or EAR OSSICLES.	Conductive Hearing Loss