Experimental Round Window Injury in Middle Ear Effusion

Abstract

Middle ear effusions were produced in guinea pigs by occluding the middle ear orifices of the eustachian tube. Then the round window membranes were incised and electrophysiological consequences were measured by ABR and EcochG.
Results are summarized as follows:
1) Incised round window membranes were healed within 30 days.
2) Subtractive loss type hearing impairments were recorded to the acoustic stimuli above 4, 000Hz.