In:
Journal of Speech, Language, and Hearing Research, American Speech Language Hearing Association, Vol. 25, No. 4 ( 1982-12), p. 611-618
Abstract:
Two-component tympanometry with a high probe-tone frequency enables a better distinction to be made between mobile but normal middle-ear systems and middle-ear systems suffering from necrosis, luxation, or disruption. Susceptance and conductance tympanograms obtained from 14 patients with confirmed pathological middle-ear lesions and 8 postmortem temporal bones, experimentally manipulated either surgically or with a 1 N HC1 solution, were compared to tympanograms obtained from 80 normal subjects of an earlier study. With a 660-Hz probe tone, normal middle ears generate bell-shaped or normal sharp W-shaped patterns, whereas the pathologies of the middle ear give rise to irregular multi-extrema tympanograms. The differences between the two types of multi-extrema curves are discussed in detail. The use of phase-angle tympanometry is recommended to enable a quick and accurate distinction between normal and abnormal types of multi-extrema tympanograms. This study also points out clearly that 220-Hz tympanograms do not allow clear differentiation between pathological and normal middle ears.
Type of Medium:
Online Resource
ISSN:
1092-4388
,
1558-9102
DOI:
10.1044/jshr.2504.611
Language:
English
Publisher:
American Speech Language Hearing Association
Publication Date:
1982
detail.hit.zdb_id:
2070420-3
SSG:
5,2
SSG:
7,11
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