Intracochlear Sound Pressure Measurements in Normal Human Temporal Bones During Bone Conduction Stimulation

Journal of the Association for Research in Otolaryngology : JARO
Christof StiegerHideko Heidi Nakajima

Abstract

Bone conduction (BC) is heavily relied upon in the diagnosis and treatment of hearing loss, but is poorly understood. For example, the relative importance and frequency dependence of various identified BC sound transmission mechanisms that contribute to activate the cochlear partition remain unknown. Recently, we have developed techniques in fresh human cadaveric specimens to directly measure scalae pressures with micro-fiberoptic sensors, enabling us to monitor the input pressure drive across the cochlear partition that triggers the cochlear traveling wave during air conduction (AC) and round-window stimulation. However, BC stimulation poses challenges that can result in inaccurate intracochlear pressure measurements. Therefore, we have developed a new technique described here that allows for precise measurements during BC. Using this new technique, we found that BC stimulation resulted in pressure in scala vestibuli that was significantly higher in magnitude than in scala tympani for most frequencies, such that the differential pressure across the partition-the input pressure drive-was similar to scala vestibuli pressure. BC (stimulated by a Bone Anchored Hearing Aid [Baha]) showed that the mechanisms of sound transmission in...Continue Reading

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Citations

Sep 10, 2019·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Charlotte BorgersNicolas Verhaert
Dec 21, 2019·International Journal of Audiology·Christiane D'hondtNicolas Verhaert
Apr 3, 2020·The Journal of the Acoustical Society of America·Ivo DobrevChristof Röösli
Dec 1, 2020·Computer Methods in Biomechanics and Biomedical Engineering·Yu ZhaoXinsheng Huang
Jan 4, 2021·Hearing Research·Lukas GrafChristof Stieger
Aug 3, 2021·Hearing Research·C RöösliF Pfiffner

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