Beattie R C, Garcia E, Johnson A
Department of Communicative Disorders, California State University, Long Beach 90840, USA.
Audiology. 1996 Jul-Aug;35(4):194-203. doi: 10.3109/00206099609071941.
The purpose of this study was to investigate the prediction of pure tone thresholds from auditory brainstem response (ABR) thresholds to tone bursts in noise using two formulae: (1) a correction factor based on the average difference between pure tone thresholds and ABR thresholds, and (2) a regression equation describing the relationship between pure tone thresholds and ABR thresholds. Twenty subjects with mild to moderate sensorineural hearing loss were tested with tone bursts having 1 millisecond rise-plateau-fall times in highpass noise (500 Hz) and notch noise (1000, 2000, and 4000 Hz). The data revealed that the pure tone-ABR threshold difference systematically decreased as frequency increased. Mean differences were approximately 25 dB at 500 Hz and 1000 Hz, 15 dB at 2000 Hz, and 10 dB at 4000 Hz. Using these correction factors, approximately 90 per cent of pure tone thresholds were predicted within +/- 10 dB at 2000 Hz and 4000 Hz, and within +/- 20 dB at 500 Hz and 1000 Hz. Similar results were found using the regression formulae. The results suggest that ABR thresholds to tone bursts in noise may provide valuable information on the auditory sensitivity and audiometric configuration of difficult-to-test patients.
本研究的目的是使用两个公式，研究从听性脑干反应（ABR）阈值对噪声中的短音纯音阈值进行预测：（1）基于纯音阈值与ABR阈值平均差异的校正因子，以及（2）描述纯音阈值与ABR阈值之间关系的回归方程。对20名轻至中度感音神经性听力损失的受试者，使用高通噪声（500 Hz）和陷波噪声（1000、2000和4000 Hz）中上升-平台-下降时间为1毫秒的短音进行测试。数据显示，随着频率增加，纯音-ABR阈值差异系统性降低。在500 Hz和1000 Hz时平均差异约为25 dB，在2000 Hz时为15 dB，在4000 Hz时为10 dB。使用这些校正因子，在2000 Hz和4000 Hz时，约90%的纯音阈值预测在±10 dB范围内，在500 Hz和1000 Hz时在±20 dB范围内。使用回归公式也得到了类似结果。结果表明，噪声中短音的ABR阈值可能为难以测试的患者的听觉敏感性和听力图配置提供有价值的信息。
