Dagna Federico, Canale Andrea, Lacilla Michelangelo, Albera Roberto
ENT Division, University of Turin, Italy.
ENT Division, University of Turin, Italy.
Auris Nasus Larynx. 2014 Feb;41(1):27-30. doi: 10.1016/j.anl.2013.07.004. Epub 2013 Aug 2.
To assess differences in hearing threshold estimation of four different ABR tone-bursts at 1kHz.
Twenty-one (21) ears from 11 subjects were tested with pure-tone audiometry (PTA): 5 ears (24%) were normal hearing, 5 (24%) affected by mild hearing loss, 7 (33%) showed moderate hearing loss and 4 (19%) severe hearing loss. After PTA each subject underwent tone-burst ABR test at 1kHz using a linear gated (L_ABR) or Blackman windowed (B_ABR) stimuli with (nn_ABR) and without ipsilateral notched noise. Stimulation rate and filters settings were unchanged.
Overall correlation between PTA and all ABRs thresholds was high, ranging from 0.84 to 0.94. In normal hearing ears none of the differences was significant, except for those measured with B_nn_ABR, which showed a mean 16dB overestimation of the pure-tone threshold (p<0.05). In mild hearing loss group none of the differences between thresholds were significant. In moderate and severe hearing loss groups significant differences were measured with L_nn_ABR (p<0.05) with a mean 7.5dB underestimation of PTA.
Although very similar, some significant differences were found when considering specific group of patients with different degrees of hearing loss.
评估1kHz时四种不同听性脑干反应（ABR）短纯音听力阈值估计的差异。
对11名受试者的21只耳朵进行纯音听力测试（PTA）：5只耳朵（24%）听力正常，5只（24%）有轻度听力损失，7只（33%）有中度听力损失，4只（19%）有重度听力损失。PTA测试后，每位受试者使用线性门控（L_ABR）或布莱克曼窗（B_ABR）刺激，在有（nn_ABR）和无同侧陷波噪声的情况下，进行1kHz的短纯音ABR测试。刺激率和滤波器设置保持不变。
PTA与所有ABR阈值之间的总体相关性较高，范围为0.84至0.94。在听力正常的耳朵中，除了用B_nn_ABR测量的差异外，其他差异均无统计学意义，B_nn_ABR显示纯音阈值平均高估16dB（p<0.05）。在轻度听力损失组中，阈值之间的差异均无统计学意义。在中度和重度听力损失组中，L_nn_ABR测量到显著差异（p<0.05），平均低估PTA 7.5dB。
虽然非常相似，但在考虑不同程度听力损失的特定患者群体时，发现了一些显著差异。
