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The doubtful value of tympanometry in the diagnosis of otosclerosis

Published online by Cambridge University Press:  29 June 2007

G. G. Browning ,
I. R. C. Swan  and
S. Gatehouse
G. G. Browning*
Affiliation:
Department of Otorhinolaryngology, Royal Infirmary, Glasgow G4 0SF. Scottish Section, MRC Insitute of Hearing Research, Southern Genral Hospital, Glasgow G51 4TF.
I. R. C. Swan
Affiliation:
Department of Otorhinolaryngology, Royal Infirmary, Glasgow G4 0SF.
S. Gatehouse
Affiliation:
Scottish Section, MRC Insitute of Hearing Research, Southern Genral Hospital, Glasgow G51 4TF.
*
Mr. G. G. Browing, Senior Lecturer in Otolaryngology, MRC Institute of Hearing Research, Scottish Section, Southern General Hospital, Glasgow G51 4TF.
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Abstract

Many consider that the compliance of the middle ear as measured from the tympanogram can be helpful in diagnosing otosclerosis. To test this assertion, the compliance in 34 individuals with surgically proven otosclerosis was compared with the compliance in 34 age and sex matched, normal controls, randomly selected from the population. Though the mean compliance was different in the two groups, there was considerable overlap in the range of values which severely limits the practical usefulness of tympanometry.

If the level of compliance is taken at which a false negative diagnosis would be made in 10 per cent of otosclerotic ears, a false positive diagnosis of otosclerosis would be made in 88 per cent of normal ears. If the level of compliance is taken at which a false positive diagnosis of otosclerosis would be made in 10 per cent of normal ears, 72 per cent of ears with otosclerosis would be considered normal.

It is concluded that tympanometry will not help to arrive at a diagnosis of otosclerosis.

Type
Research Article
Information
The Journal of Laryngology & Otology , Volume 99 , Issue 6 , June 1985 , pp. 545 - 547
Copyright
Copyright © JLO (1984) Limited 1985

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