Surr R K, Schuchman G I
Arch Otolaryngol. 1976 Mar;102(3):160-1. doi: 10.1001/archotol.1976.00780080082010.
Obtaining a hermetic seal in the external auditory canal is often a major obstacle in impedance audiometry. In the present study, the acoustic reflex threshold was determined for three groups of subjects, first with and then without a pressure-tight seal. It was found that for subjects with normal hearing or sensorineural hearing loss and normal tympanograms, 96% of the measurements obtained without a pressure seal were within 5 dB of those obtained with a seal. Among the subjects who exhibited negative middle ear pressure, the acoustic reflex could be measured consistently at the point of maximum compliance, while no response was observed without a pressure seal.
在外耳道获得密封通常是阻抗测听中的一个主要障碍。在本研究中，对三组受试者测定了声反射阈值，首先是在有压力密封的情况下，然后是在没有压力密封的情况下。结果发现，对于听力正常或感音神经性听力损失且鼓室图正常的受试者，在没有压力密封的情况下获得的测量值中，96%与有密封时获得的测量值相差在5 dB以内。在中耳压力为负的受试者中，在最大顺应点可以持续测量到声反射，而在没有压力密封的情况下未观察到反应。
