目的:听神经瘤(acoustic neuroma,AN)是一种良性肿瘤,通常会影响患者的听觉和前庭功能.对于AN的筛查和诊断,传统方法主要依赖于听力学检查和磁共振成像(magnetic resonance imaging,MRI),而忽略了对病变部位进行前庭功能评估的重要性.视频头脉冲试验(video head impulse test,vHIT)是一种新兴的前庭功能检测方法,已广泛应用于临床,但其应用于AN诊断的研究相对较少.本研究通过在术前及术后对经迷路入路AN切除术的单侧AN患者采用vHIT进行动态检测,以探究vHIT在AN诊断、前庭功能障碍评估、术后代偿建立中的价值.方法:回顾性纳入2020年10月至2022年3月中南大学湘雅二医院耳鼻咽喉头颈外科的27例经迷路入路AN切除术单侧患者.术前1周进行vHIT以评估前庭功能,纯音测听(pure tone audiometry,PTA)评估听力水平,耳部MRI评估肿瘤大小;分别于术后1周、1个月、6个月、1年复查vHIT,并分析vHIT与听力、肿瘤大小之间的相关性.结果:术前vHIT显示患侧后半规管是前庭眼反射(vestibulo-ocular reflex,VOR)增益降低最常见的半规管.术前患侧vHIT的VOR增益与听力水平(r=-0.47,P<0.05)或肿瘤大小(r=-0.54,P<0.01)存在显著相关性.术后患侧vHIT结果显示水平半规管和前半规管的平均VOR增益随时间略有上升;3个半规管显性扫视的振幅和扫视波百分比均增加,而潜伏期时间缩短,并且在术后1周变化最明显.结论:vHIT能有效监测AN患者手术前后的前庭功能变化,对辅助诊断和治疗AN患者前庭功能障碍具有临床应用价值.
Changes of video head impulse test before and after translabyrinthectomy in patients with acoustic neuroma
Objective:Acoustic neuroma(AN)is a benign tumor that usually affects a patient's hearing and balance function.For the screening and diagnosis of AN,the traditional approach mainly relies on audiological examination and magnetic resonance imaging(MRI),often ignoring the importance of vestibular function assessment in the affected area.As an emerging method of vestibular function detection,video head impulse test(vHIT)has been widely used in clinic,but research on its use in AN diagnosis is relatively limited.This study aims to explore the value of vHIT in the diagnosis of AN,vestibular dysfunction assessment,and postoperative compensation establishment in unilateral AN patients undergoing unilateral AN resection through labyrinthine approach.Methods:This retrospective study was conducted on 27 AN patients who underwent unilateral AN resection via labyrinthine approach from October 2020 to March 2022 in the Department of Otolaryngology-Head and Neck Surgery,the Second Xiangya Hospital,Central South University.vHIT was performed 1 week before surgery to assess vestibular function,pure tone audiometry(PTA)was used to assess hearing level,and ear MRI was used to assess tumor size.Follow-up vHIT was conducted at 1 week,1 month,6 months,and 1 year post-surgery.The correlation of vHIT with hearing and tumor size was analyzed.Results:Preoperative vHIT showed that the posterior semicircular canal on the affected side was the most common semicircular canal with reduced vestibulo-ocular reflex(VOR)gain.There was a correlation between the VOR gain of vHIT on the affected side and the hearing level(r=-0.47,P<0.05)or tumor size(r=-0.54,P<0.01).The results of vHIT on the affected side showed that the hearing level and mean VOR gain of the anterior semicircular canal increased slightly with time,and the amplitude and saccade percentage of the dominant saccades of the 3 semicircular canals increased,while the latency time decreased,with the most obvious changes occurring 1 week post-surgery.Conclusion:vHIT can effectively monitor the changes of vestibular function in AN patients before and after surgery and has application value in assisting the diagnosis of vestibular dysfunction in AN patients.
acoustic neuromacaloric testvideo head impulse testhead impulse suppression testvestibular function
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