C_S_D 4340 Lecture Notes - Lecture 16: Endolymphatic Hydrops, Endolymphatic Sac, Sensorineural Hearing Loss
29 Jul 2016
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Lecture 16: sensorineural hearing loss part 1. Congenital - present at birth: genetic. Bilateral snhl that is worse in the highs: some asymmetry is possible in specific instances but not often, not dependent on the frequency content of the noise, hearing loss is progressive w/ continued exposure but rarely becomes profound. Factors contributing to damage: level/distance from source, duration of the noise, temporal pattern of the noise, spectrum of the noise, individual susceptibility, not remediated medically or surgically. Ototoxicity: hearing damage resulting from exposure to drugs, ototoxicity can be subclinical or it can result in profound deafness and impaired balance. Can be permanent or temporary, unilateral or bilateral: affects the cochlea resulting in sensorineural hearing loss, ohcs and high frequencies seem to be affected first. Presbycusis: hearing loss due to old age. 24. due to widespread physiologic degeneration combined w/ effects of noise, medical history and hereditary factors. 25. speech perception decreases w/ age and is most common complaint.
