Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zürich, Zürich, Switzerland.
Department of Otorhinolaryngology, Head and Neck Surgery, University of Zürich, Zürich, Switzerland.
Int J Audiol. 2022 Aug;61(8):678-685. doi: 10.1080/14992027.2021.1903586. Epub 2021 Jun 7.
To investigate transcranial transmission (TT) and the dampening effect of the skin in patients and cadaver heads.
In patients a pure tone bone conduction audiogram for ipsilateral and contralateral stimulation was performed. The TT was defined as the difference between ipsilateral and contralateral hearing thresholds. In cadaver heads ipsilateral and contralateral promontory motion was measured using a three-dimensional Laser Doppler Vibrometer system.
Seven single-sided deaf patients fitted with a Baha Connect, fifteen single-sided deaf patients without a bone conduction hearing aid and five Thiel-embalmed cadaver heads were included.
The TT decreased with increasing frequency in patients and cadaver heads. No significant difference was seen between patients and cadaver heads. Measurements on patients and cadaver heads showed increasing skin attenuation with increasing frequency. However, the dampening effect was 3-12 dB higher in patients than in cadavers at all frequencies.
The TT was not significantly different for patients compared to cadaver heads. The value of promontory motion to estimate TT in patients need to be further evaluated. The skin attenuates a BC stimulus by 10-20 dB in patients and by a smaller amount in cadaver heads, probably due to changes in the properties of the Thiel-conserved skin.
研究经颅传递（TT）和皮肤的衰减效应对患者和尸体头颅的影响。
在患者中，对同侧和对侧刺激进行纯音骨导听阈测试。TT 定义为同侧和对侧听阈之差。在尸体头颅中，使用三维激光多普勒测振仪系统测量同侧和对侧鼓岬运动。
7 名单侧聋患者佩戴 Baha Connect，15 名单侧聋患者未佩戴骨导助听器，5 名经 Thiel 防腐处理的尸体头颅。
TT 在患者和尸体头颅中随频率增加而降低。患者和尸体头颅之间无显著差异。患者和尸体头颅的测量结果显示，皮肤衰减随频率增加而增加。然而，在所有频率下，患者的衰减效果比尸体头颅高 3-12dB。
与尸体头颅相比，患者的 TT 没有显著差异。需要进一步评估鼓岬运动来估计患者 TT 的价值。皮肤对 BC 刺激的衰减在患者中为 10-20dB，在尸体头颅中衰减较小，可能是由于 Thiel 保存的皮肤特性发生变化所致。
