W. Paul Biggers Carolina Children's Communicative Disorders Program, Department of Otolaryngology-Head and Neck Surgery and the Division of Audiology, University of North Carolina Hospitals, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7600, USA.
Ear Hear. 2010 Jun;31(3):325-35. doi: 10.1097/AUD.0b013e3181ce693b.
OBJECTIVE: To report the patient's characteristics, preoperative audiological profiles, surgical outcomes, and postoperative performance for children with auditory neuropathy spectrum disorder (ANSD) who ultimately received cochlear implants (CIs). DESIGN: Prospective, longitudinal study of children with ANSD who received CIs after a stepwise management protocol that included electrophysiologic and medical assessment, documentation of behavioral audiometric thresholds and subsequent fitting of amplification according to Desired Sensation Level targets, auditory-based intervention with careful monitoring of skills development and communication milestones, and finally implantation when progress with the use of acoustic amplification was insufficient. RESULTS: Of 140 children with ANSD, 52 (37%) received CIs in their affected ears (mean duration of use of 41 mos). Many of these children were born prematurely (42%) and impacted by a variety of medical comorbidities. More than one third (38%) had abnormal findings on preoperative magnetic resonance imaging of the brain and inner ear, and 81% had a greater than severe (>70 dB HL) degree of hearing loss before implantation. Although 50% of the implanted children with ANSD demonstrated open-set speech perception abilities after implantation, nearly 30% of them with >6 months of implant experience were unable to participate in this type of testing because of their young age or developmental delays. No child with cochlear nerve deficiency (CND) in their implanted ear achieved open-set speech perception abilities. In a subgroup of children, good open-set speech perception skills were associated with robust responses elicited on electrical-evoked intracochlear compound action potential testing when this assessment was possible. CONCLUSIONS: This report shows that children with ANSD who receive CIs are a heterogeneous group with a wide variety of impairments. Although many of these children may ultimately benefit from implantation, some will not, presumably because of a lack of electrical-induced neural synchronization, the detrimental effects of their other associated conditions, or a combination of factors. When preoperative magnetic resonance imaging reveals central nervous system pathology, this portends a poor prognosis for the development of open-set speech perception, particularly when CND is evident. These results also show that electrical-evoked intracochlear compound action potential testing may help identify those children who will develop good open-set speech perception. Instead of recommending CI for all children with electrophysiologic evidence of ANSD, the stepwise management procedure described herein allows for the identification of children who may benefit from amplification, those who are appropriate candidates for cochlear implantation, and those who, because of bilateral CND, may not be appropriate candidates for either intervention.
目的:报告最终接受人工耳蜗植入(CI)的听神经病谱系障碍(ANSD)患儿的患者特征、术前听力学特征、手术结果和术后表现。
设计:对接受 CI 的 ANSD 患儿进行前瞻性、纵向研究,这些患儿采用了逐步管理方案,包括电生理和医学评估、行为听阈记录以及根据期望感觉水平目标随后适配放大、基于听觉的干预并仔细监测技能发展和沟通里程碑,最后在使用声学放大效果不足时进行植入。
结果:在 140 名 ANSD 患儿中,52 名(37%)在受影响的耳朵中接受了 CI(平均使用时间为 41 个月)。这些患儿中有许多是早产儿(42%),并受到各种医疗合并症的影响。三分之一以上(38%)患儿的术前脑和内耳磁共振成像有异常发现,81%患儿在植入前有大于重度(>70 dB HL)的听力损失。尽管 50%植入 ANSD 的患儿在植入后表现出开放式言语感知能力,但由于年龄较小或发育迟缓,近 30%植入后有>6 个月的患儿无法进行这种类型的测试。植入耳有耳蜗神经缺失(CND)的患儿均未获得开放式言语感知能力。在一组患儿中,当可以进行电诱发耳蜗内复合动作电位测试时,良好的开放式言语感知技能与在该评估中引出的强大反应相关。
结论:本报告表明,接受 CI 的 ANSD 患儿是一个异质性群体,存在多种损伤。尽管这些患儿中的许多人最终可能受益于植入,但有些人不会,大概是因为缺乏电诱导的神经同步,他们其他相关疾病的不利影响,或多种因素的综合作用。术前磁共振成像显示中枢神经系统病变预示着开放式言语感知能力的发展预后不良,尤其是 CND 明显时。这些结果还表明,电诱发耳蜗内复合动作电位测试可能有助于识别那些将发展出良好开放式言语感知能力的患儿。本文描述的逐步管理程序允许识别可能受益于放大的患儿、适合接受耳蜗植入的患儿,以及由于双侧 CND 可能不适合这两种干预的患儿,而不是建议所有具有 ANSD 电生理证据的患儿都进行 CI。
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