Hutton J N
Clin Otolaryngol Allied Sci. 1976;1(1):39-44. doi: 10.1111/j.1365-2273.1976.tb00640.x.
Until recently Ketamine has been the anaesthetic most commonly used for electrocochleography. It was believed that the use of a conventional anaesthetic machine would produce artifacts in the recordings but experience has shown that this is not the case; in fact quieter tracings are obtained due to the abolition of muscle potentials. Ketamine is preferred for children under 3 years old but the others receive a general inhalation anaesthetic. The intramuscular route is chosen for the administration of Ketamine in order to minimize the occurrence of hallucinations in the recovery period. Consistent results have been obtained with a dosage related to the metabolic rate of the child. One milligram of Ketamine is administered for each 35 cm2 of surface area. General inhalation anaesthesia is given by a semiopen circuit and an oral endotracheal tube is used. Induction is with methohexitone or nitrous oxide and halothane, and maintenance is also with nitrous oxide and halothane. The main drawback is pollution of the atmosphere of the sound-proofed testing room with halothane. This has been overcome by ducting the expired gases outside the room using an Enderby valve.
直到最近，氯胺酮一直是耳蜗电图最常用的麻醉剂。人们曾认为使用传统麻醉机会在记录中产生伪迹，但经验表明并非如此；事实上，由于肌肉电位的消除，记录反而更清晰。3岁以下儿童首选氯胺酮，其他儿童则接受全身吸入麻醉。为尽量减少恢复期幻觉的发生，氯胺酮采用肌肉注射途径给药。根据儿童代谢率确定的剂量可获得一致的结果。每35平方厘米表面积给予1毫克氯胺酮。全身吸入麻醉采用半开放式回路，使用口腔气管内导管。诱导使用美索比妥或氧化亚氮和氟烷，维持麻醉也使用氧化亚氮和氟烷。主要缺点是隔音测试室内的空气被氟烷污染。通过使用恩德比阀将呼出气体导出室外，这一问题已得到解决。
