细菌性脑膜炎致聋患者内耳影像学观察及人工耳蜗置入术

目的 :了解细菌性脑膜炎后内耳MRI影像学的变化 ,及对人工耳蜗置入术的影响。方法 :细菌性脑膜炎致聋患者 5例 (10耳 )行听性脑干诱发反应 (ABR)和内耳MRI检查 ,实施人工耳蜗置入术。结果 :MRI成像检查 ,耳蜗膜迷路形态异常 5耳 ,前庭形态异常 3耳 ,半规管形态异常 8耳 ;10耳的平均听阈为 (10 2 .0± 7.1)dBHL ,手术耳的平均听阈为 (98.0± 5 .7)dBHL ,非手术耳的平均听阈为 (10 6 .0± 6 .5 )dBHL ;实施人工耳蜗置入术时 3耳没能将电极全部插入 ;发病到发现听力下降平均为 (15 .8± 15 .0 )d ,小儿较成人发现听力下降时间延迟。结论 :细菌性脑膜炎可引起不同程度的内耳形态异常 ,人工耳蜗置入术前进行MRI检查可以发现内耳形态异常的程度 ,利于正确选择术耳及手术的顺利进行

Magnetic resonance imaging study and cochlear implantation in post-meningitic deaf patients

OBJECTIVE: To investigate the clinical application of magnetic resonance imaging (MRI) in post-meningitic patients and its impact on surgical decision. METHOD: The pre-operative MRI data and auditory brainstem response (ABR) examination of five post-meningitic patients were studied. They were implanted with cochleas. RESULT: The interval between the onset of bacterial meningitis and the hearing loss was (15.8 +/- 15.0)d and it was longer in children than adults. Five ears showed membranous cochlear labyrinth abnormality; 3 ears had vestibule vestibule abnormality; 8 ears demonstrated semicircular canal abnormality on MRI examinations in totally 10 ears. The mean hearing threshold of 10 ears was (102.0 +/- 7.1)dB HL,that of the operated ears was (98.0 +/- 5.7)dB HL and that of the un-operated ears was (106.0 +/- 6.5)dB HL. It was (15.8 +/- 15.0)d from the bacterial meningitis onset to hearing loss. The interval is longer in children than adults. There were 3 ears that electrodes could not be inserted completely. CONCLUSION: The bacterial meningitis may cause the abnormalities of inner ears and the MRI before surgery is essential for the pre-operative planning of cochlear implant.