ENT Division, University of Turin, Via Genova 3, 10126, Turin, Italy.
Eur Arch Otorhinolaryngol. 2012 Mar;269(3):781-5. doi: 10.1007/s00405-011-1723-7. Epub 2011 Aug 4.
To assess the reliability of Blackman windowed tone burst auditory brainstem response (ABR) as a predictor of hearing threshold at low frequencies. Fifty-six subjects were divided in to three groups (normal hearing, conductive hearing loss, sensorineural hearing loss) after pure tone audiometry (PTA) testing. Then they underwent tone burst ABR using Blackman windowed stimuli at 0.5 kHz and 1 kHz. Results were compared with PTA threshold. Mean threshold differences between PTA and ABR ranged between 11 dB at 0.5 kHz and 14 dB at 1 kHz. ABR threshold was worse than PTA in each but 2 cases. Mean discrepancy between the two thresholds was about 20 dB in normal hearing, reducing in presence of hearing loss, without any differences in conductive and sensorineural cases. Tone burst ABR is a good predictor of hearing threshold at low frequencies, in case of suspected hearing loss. Further studies are recommended to evaluate an ipsilateral masking such as notched noise to ensure greater frequency specificity.
评估 Blackman 窗短纯音听觉脑干反应（ABR）作为低频听力阈值预测指标的可靠性。纯音测听（PTA）测试后，56 名受试者被分为三组（正常听力、传导性听力损失、感音神经性听力损失）。然后，他们接受了使用 Blackman 窗短纯音刺激在 0.5 kHz 和 1 kHz 下的短纯音 ABR 测试。结果与 PTA 阈值进行了比较。PTA 和 ABR 阈值之间的平均差异在 0.5 kHz 时为 11 dB，在 1 kHz 时为 14 dB。除了 2 例外，ABR 阈值在每种情况下都比 PTA 差。在正常听力的情况下，两个阈值之间的平均差异约为 20 dB，随着听力损失的存在而减小，在传导性和感音神经性病例中没有差异。在疑似听力损失的情况下，短纯音 ABR 是低频听力阈值的良好预测指标。建议进行进一步的研究，以评估同侧掩蔽（如缺口噪声），以确保更高的频率特异性。
