Impedance measurements: Some recent developments

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Abstract
The role of impedance audiometry was considered. The impedance bridge, the applications of which are still developing, was the most versatile instrument for examining deafness objectively. Not only could it usually distinguish conductive from sensorineural deafness and cochlear from retrocochlear disorders, but it now even gives an objective estimate of the hearing threshold. It also had an increasing role in neurology, since it can give evidence of angle tumors and brain stem disease even in patients with normal hearing. Some recently developed tests based on the stapedial reflex were briefly outlined.

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