Bone-conduction hyperacusis induced by superior canal dehiscence in human: the underlying mechanism
Autor: | John J. Rosowski, Deepa J. Galaiya, Daniel J. Lee, Hideko Heidi Nakajima, Y. Song Cheng, Xiying Guan |
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Rok vydání: | 2020 |
Předmět: |
medicine.medical_specialty
Semicircular Canal Dehiscence lcsh:Medicine Diseases Audiology Article Loudness 03 medical and health sciences Medical research 0302 clinical medicine Bone conduction Hearing Cochlear partition otorhinolaryngologic diseases Cadaver Humans Medicine lcsh:Science 030223 otorhinolaryngology Cochlea Superior canal dehiscence Multidisciplinary business.industry Mechanism (biology) lcsh:R Hyperacusis Labyrinthine Fluids Audiogram Scala Tympani medicine.disease Semicircular Canals Sound lcsh:Q sense organs medicine.symptom business Bone Conduction 030217 neurology & neurosurgery |
Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-11 (2020) |
ISSN: | 2045-2322 |
DOI: | 10.1038/s41598-020-73565-4 |
Popis: | Our ability to hear through bone conduction (BC) has long been recognized, but the underlying mechanism is poorly understood. Why certain perturbations affect BC hearing is also unclear. An example is BC hyperacusis (hypersensitive BC hearing)—an unnerving symptom experienced by patients with superior canal dehiscence (SCD). We measured BC-evoked sound pressures in scala vestibuli (PSV) and scala tympani (PST) at the basal cochlea in cadaveric human ears, and estimated hearing by the cochlear input drive (PDIFF = PSV – PST) before and after creating an SCD. Consistent with clinical audiograms, SCD increased BC-driven PDIFF below 1 kHz. However, SCD affected the individual scalae pressures in unexpected ways: SCD increased PSV below 1 kHz, but had little effect on PST. These new findings are inconsistent with the inner-ear compression mechanism that some have used to explain BC hyperacusis. We developed a computational BC model based on the inner-ear fluid-inertia mechanism, and the simulated effects of SCD were similar to the experimental findings. This experimental-modeling study suggests that (1) inner-ear fluid inertia is an important mechanism for BC hearing, and (2) SCD facilitates the flow of sound volume velocity through the cochlear partition at low frequencies, resulting in BC hyperacusis. |
Databáze: | OpenAIRE |
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