Rahne Torsten, Ehelebe Thomas
Department of Otorhinolaryngology and Halle Hearing and Implant Center, University Hospital Halle (Saale) of Martin-Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany.
ScientificWorldJournal. 2014;2014:247942. doi: 10.1155/2014/247942. Epub 2014 Apr 10.
Patients suffering from conductive or mixed hearing loss may benefit from bone-conduction hearing systems (BAHS). The amount of amplification provided by the hearing system is selected based on the individual's sensorineural frequency-specific threshold. With patients who are not able to provide thresholds behaviorally, such as young children, objective methods are required to estimate the unaided and aided hearing threshold and thus the success of the hearing system fitting. In a prospective study with ten adult Baha softband users, aided and unaided frequency-specific thresholds were estimated. Aided thresholds to tone bursts via Baha stimulation were obtained behaviorally and electrophysiologically using cortical auditory evoked potentials (CAEPs) and were compared to pure-tone thresholds using routine clinical audiometry. For all stimulation frequencies, the frequency-specific electrophysiological and behavioral hearing thresholds measured with Baha stimulation were highly correlated and not different. Increased thresholds were observed only with the 0.5 kHz Baha stimulation as compared to the pure-tone audiogram. Objective measurement of frequency-specific hearing thresholds with CAEPs is applicable to BAHS users.
患有传导性或混合性听力损失的患者可能会从骨传导听力系统（BAHS）中受益。听力系统提供的放大量是根据个体的感音神经性频率特异性阈值来选择的。对于无法通过行为方式提供阈值的患者，如幼儿，需要采用客观方法来估计未使用辅助设备时的听力阈值以及使用辅助设备后的听力阈值，从而确定听力系统适配的成功率。在一项针对10名成年Baha软带使用者的前瞻性研究中，对使用辅助设备和未使用辅助设备时的频率特异性阈值进行了估计。通过Baha刺激获得了对短纯音的辅助设备阈值，采用皮层听觉诱发电位（CAEP）进行行为学和电生理学测量，并与常规临床听力测定的纯音阈值进行比较。对于所有刺激频率，通过Baha刺激测量的频率特异性电生理学和行为学听力阈值高度相关且无差异。与纯音听力图相比，仅在0.5kHz的Baha刺激下观察到阈值升高。使用CAEP对频率特异性听力阈值进行客观测量适用于BAHS使用者。
