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Dr. Groves, London: I come from the Royal Free Hospital where I have had for some years the very good fortune to have the assistance of my colleagues, Dr. Richardson and Dr. Campbell, in the problems of electrodiagnosis in facial paralysis. Before I mention nerve excitability tests, I should like to raise one small point in connection with tests for the stapedius reflex. I am very interested indeed in Dr. Jepsen's comments about the measurement of the acoustic impedance in assessing lesions of the nerve to the stapedius. I would like to have facilities for using this method, but we do not have them, and we have been using instead a very simple test which simply consists of a loudness balance test between the two ears which Perlmann wrote about in 1938. This simply demonstrates that the stapedius reflex is ineffective or impaired at high sound intensities, and by merely
DISCUSSION: OF DIAGNOSTIC TESTS. Arch Otolaryngol. 1965;81(5):485–488. doi:10.1001/archotol.1965.00750050498008
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