Birch L, Elbrønd O, Kristiansen L
Scand Audiol. 1986;15(3):151-6. doi: 10.3109/01050398609070691.
In order to compare the impedance audiometer ZO 73 A with the impedance tympanoscope ZS 330 (both from Madsen Electronics), we examined 50 children who had been admitted to the ENT Department and 24 children from a kindergarten. There proved to be a good correlation between the middle ear pressure, except that ZO 330 showed a rather lower middle ear pressure. As regards compliance too there was a good correlation. The ipsilateral stapedial reflex was rather labile, and in 68% of the ears the two instruments showed conformity, while in 15% only ZO 73 A and in 17% only ZS 330 could elicit the reflex. When the middle ear pressure was lower than -100 mmH2O, the ipsilateral stapedial reflex could be elicited in only 25% of the cases, even though the middle ear pressure was equalized.
为了比较阻抗听力计ZO 73 A与阻抗鼓室镜ZS 330（均来自麦迪生电子公司），我们检查了50名耳鼻喉科住院儿童和24名幼儿园儿童。结果发现中耳压力之间存在良好的相关性，只是ZO 330显示的中耳压力略低。关于顺应性也存在良好的相关性。同侧镫骨肌反射相当不稳定，在68%的耳朵中两种仪器显示一致，而在15%的耳朵中只有ZO 73 A能引出反射，在17%的耳朵中只有ZS 330能引出反射。当中耳压力低于-100 mmH2O时，即使中耳压力已平衡，同侧镫骨肌反射仅在25%的病例中能引出。
