Migirov Lela, Kronenberg Jona
Department of Otolaryngology and Head and Neck Surgery, Sheba Medical Center, Tel Aviv, Israel.
Otol Neurotol. 2005 Jul;26(4):646-8. doi: 10.1097/01.mao.0000178144.06387.8a.
To describe a rare complication of cochlear implantation, such as magnet displacement.
Retrospective case review.
The study was conducted at the Sheba Medical Center, Tel-Aviv, Israel.
One child presented with an external coil attached to the skin anteriorly to the receiver/stimulator site (20 months after implantation) and another child was seen with a displaced magnet under the skin a few days after a head trauma (28 months after implantation). Both children were implanted with the Nucleus 24 device at the age of 2 years.
Plain skull radiographs showed the dislocated magnet in both cases. Surgery for each child was limited to revision of the receiver/stimulator site and reinsertion of the magnet to its pocket.
Intraoperative Neural Response Telemetry well displayed the responses of evoked potentials of the auditory nerve within the cochlea in both children. Postoperative auditory responses were as good as those measured before the complication.
The displaced magnet can be successfully managed by a simple revision procedure. The possibility of magnet migration should be considered in cases of device malfunction. Two cases of magnet migration from its pocket after cochlear implantation are presented. The diagnostic and surgical method used for resolving this condition are described.
描述人工耳蜗植入的一种罕见并发症，如磁体移位。
回顾性病例分析。
该研究在以色列特拉维夫的舍巴医疗中心进行。
一名儿童在植入后20个月，其外部线圈附着于接收器/刺激器部位前方的皮肤上；另一名儿童在头部外伤后几天（植入后28个月），皮下可见磁体移位。两名儿童均在2岁时植入了Nucleus 24设备。
两位患儿的头颅平片均显示磁体脱位。每个孩子的手术仅限于修复接收器/刺激器部位并将磁体重新插入其腔室。
术中神经反应遥测很好地显示了两名儿童耳蜗内听神经诱发电位的反应。术后听觉反应与并发症发生前测得的反应一样好。
通过简单的修复手术可以成功处理移位的磁体。在设备故障的情况下应考虑磁体迁移的可能性。本文介绍了两例人工耳蜗植入后磁体从其腔室迁移的病例。描述了用于解决这种情况的诊断和手术方法。
