Multifrequency tympanometry in experimentally - induced cochlear lesions in chinchillas and guinea pigs

摘要

Objectives: to establish that susceptance-conductance tympanograms at a probe-tone frequency of 2 kHz reflects the status of the annular ligament (AL) and through it of the cochlea. Methods: experimental study in 5 chinchillas and 22 guinea pigs. Six validating experiments were used: blocka- ges of the stapes and of the round window membrane (RWM), fistula of the RWM, fluid removal from the cochlea, injection of saline in the scala tympani (ST) and acoustic trauma(AT).