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March 1976

Measurement of the Acoustic Reflex Without a Pressure Seal

Author Affiliations

From the Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, DC.

Arch Otolaryngol. 1976;102(3):160-161. 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.

(Arch Otolaryngol 102:160-161, 1976)

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