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鼓室压测量法及镫肌声反射测定有助于中耳病变的诊断。一般而言,若测试耳(接受声刺激耳)有很轻微传导性聋、而中耳系统功能正常时,偶而仍可引出声反射。但在气骨导听阈有相当差距时,则不能引出镫肌声反射。然而有时可遇到某些听骨链中断病例,虽然由于传导性听力障碍而形成气骨导差距,却可引出镫肌声反射,作者们报道2个病例,并对上述现象进行解释。在理论上,听骨链中断而有下列情况时仍可引出声反射:(1)镫骨足弓病变,但镫骨头与鼓膜之间连接正常;(2)砧骨长突为纤维索条代替;(3)鼓膜与镫骨有粘着;(4)鼓膜与镫骨间有纤维组织连接。文中报道的病例,术
Measured by tympanometry and canthus muscle acoustic reflex is helpful for the diagnosis of middle ear lesions. In general, if the test ear (accepting acoustic stimuli) has a mildly conductive deafness and the middle ear system is functioning properly, it can occasionally lead to acoustic reflexes. However, there is a considerable gap in the guideline of the airbone, it can not lead to muscle acoustic reflex. However, some cases of ossicular chain disruption may be encountered in some cases. Although the gap of the airways is formed due to conductive hearing impairment, it can lead to musculus sicus reflex. The authors reported 2 cases and explained the above phenomena. In theory, ossicular chain disruption may still lead to acoustic reflex in the following cases: (1) stapes foot disease, but 镫 bones and tympanic membrane between the normal connection; (2) the incus long bar instead of fiber cord ; (3) tympanic membrane and stapes bone adhesion; (4) between the tympanic membrane and tarsal fibrous tissue connection. The reported cases, surgery