• 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.
(Arch Otolaryngol 102:160-161, 1976)
Surr RK, Schuchman GI. Measurement of the Acoustic Reflex Without a Pressure Seal. Arch Otolaryngol. 1976;102(3):160–161. doi:10.1001/archotol.1976.00780080082010
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