Picciotti Pasqualina Maria, Giannantonio Sara, Paludetti Gaetano, Conti Guido
Institute of Otorhinolaryngology, Catholic University of the Sacred Heart, Rome, Italy.
ORL J Otorhinolaryngol Relat Spec. 2012;74(6):310-4. doi: 10.1159/000345497. Epub 2012 Dec 20.
Steady state responses (SSRs), between 75 and 110 Hz, evoked by auditory amplitude modulated single or multiple tone stimuli, may be used to estimate objective hearing threshold.
The aim of this study was to compare SSRs and click-evoked auditory brainstem responses (ABRs) in both ears of 20 adults (10 males and 10 females, aged between 24 and 36 years) with normal hearing threshold.
Mean ABR threshold was found at 21.25 (± 5.9) dB nHL. Mean SSR threshold was found at 15.6 (± 9.6) dB nHL after a single frequency stimulus (1 kHz); at 10.5 (± 18.2) dB nHL and at 7.1 (± 12.4) dB nHL after bifrequency stimulation (0.5 and 2 kHz). SSR thresholds after multifrequency stimulation (0.5, 1, 2 and 4 kHz) were found, respectively, at 12.1 (± 12.9) dB nHL, 12.2 (± 12.8) dB nHL, 12.3 (± 8.3) dB nHL and 18.9 (± 17.2) dB nHL. Mean duration of the recording session was 6 min in the case of ABRs, while it was 25 min in the single frequency condition and 29 min in the multifrequency condition in the case of SSRs.
SSRs can be used for frequency-specific objective audiometry. The multifrequency stimulation greatly reduces the whole testing time.
由听觉调幅单音或多音刺激诱发的75至110赫兹之间的稳态反应（SSRs）可用于估计客观听力阈值。
本研究的目的是比较20名听力阈值正常的成年人（10名男性和10名女性，年龄在24至36岁之间）双耳的稳态反应和短声诱发的听觉脑干反应（ABRs）。
平均ABR阈值为21.25（±5.9）dB nHL。单频刺激（1千赫）后，平均稳态反应阈值为15.6（±9.6）dB nHL；双频刺激（0.5和2千赫）后，分别为10.5（±18.2）dB nHL和7.1（±12.4）dB nHL。多频刺激（0.5、1、2和4千赫）后的稳态反应阈值分别为12.1（±12.9）dB nHL、12.2（±12.8）dB nHL、12.3（±8.3）dB nHL和18.9（±17.2）dB nHL。ABR记录的平均时长为6分钟，而稳态反应在单频条件下为25分钟，在多频条件下为29分钟。
稳态反应可用于特定频率的客观听力测定。多频刺激大大缩短了整个测试时间。
