Auditory steady-state responses air and bone conducted in children from zero to six months with and without conductive impairments

Purpose check the feasibility of searching the minimum response of the Auditory Evoked Potential Steady State by air and bone conduction in children from birth to six months and measure the “gap” air-bone of children with impairment conductive. Methods we evaluated 60 children from birth to six months, 30 with and 30 without impairment conductive, divided into a control group and study group. Were measured acoustic impedance, otorhinolaryngological evaluation, and the Auditory Evoked Potential Steady State by air and bone conduction. The Auditory Evoked Potential Steady State was carried by air with insert earphones and bone with bone vibrator. By airway responses were surveyed in both ears and bone captured only the left ear. Results in the control group, there was a predominance of type curve “A”. In the study group, there was a predominance of type curves “B” and “C”. In otorhinolaryngological evaluation found in the control group showed up normal. In the study group, opacity and tympanic membrane retraction. The Auditory Evoked Potential Steady State in the control group by air responses were around 17.2, 26.2, 22, 7 and 19.8 dBHL at frequencies 500 to 4 kHz and bone conduction between 18.8 to 20dBHL. In the study group by airway responses were 53, 56, 50.2 and 48dBNA to 500 to 4kHz and bone of 25, 25, 20 and 20dBHL. Conclusion it was possible to perform the Auditory Evoked Potential Steady State by air and bone conduction in children from birth to six months of age and the “gap” air-bone was around 20dB in children with impairment conductive.目的 探讨经气导与骨导检测出生至6月龄婴儿稳态听觉诱发电位（Auditory Evoked Potential Steady State）最小反应的可行性，并测量传导性听力损失患儿的气-骨导差。 方法 纳入60名出生至6月龄的婴儿，其中30例为传导性听力损失患儿（研究组），30例为健康婴儿（对照组）。对所有受试者开展声阻抗检测、耳鼻咽喉科评估，以及气导与骨导稳态听觉诱发电位检测：气导检测采用插入式耳机，骨导检测采用骨振动器；气导检测双耳听力，骨导仅检测左耳。 结果 对照组受试者的鼓室导抗图以A型曲线为主；研究组则以B型、C型曲线为主。耳鼻咽喉科评估显示，对照组受试者耳部及鼓膜均正常，研究组可见鼓膜混浊及鼓膜内陷。对照组气导稳态听觉诱发电位在500Hz至4kHz频段的反应阈值分别约为17.2、26.2、22.7和19.8 dBHL，骨导阈值介于18.8~20dBHL之间。研究组气导反应阈值在500Hz至4kHz频段分别为53、56、50.2和48dBNA，骨导阈值分别为25、25、20和20dBHL。 结论 本研究证实，可顺利完成出生至6月龄婴儿的气导与骨导稳态听觉诱发电位检测，传导性听力损失患儿的气-骨导差约为20dB。