Document Detail

MedLine Citation:
PMID:  15554489     Owner:  NLM     Status:  MEDLINE    
Tympanometry provides useful quantitative information about the presence of fluid in the middle ear, mobility of the middle ear system, and ear canal volume. Its use has been recommended in conjunction with more qualitative information (e.g., history, appearance, and mobility of the tympanic membrane) in the evaluation of otitis media with effusion and to a lesser extent in acute otitis media. It also can provide useful information about the patency of tympanostomy tubes. Tympanometry is not reliable in infants younger than seven months because of the highly compliant ear canals of infants. Tympanogram tracings are classified as type A (normal), type B (flat, clearly abnormal), and type C (indicating a significantly negative pressure in the middle ear, possibly indicative of pathology). According to the Agency for Healthcare Research and Quality guidelines on otitis media with effusion, the positive predictive value of an abnormal (flat, type B) tympanogram is between 49 and 99 percent. A type C curve may be useful when correlated with other findings, but by itself it is an imprecise estimate of middle ear pressure and does not have high sensitivity or specificity for middle ear disorders.
Edward Onusko
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  American family physician     Volume:  70     ISSN:  0002-838X     ISO Abbreviation:  Am Fam Physician     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-19     Completed Date:  2004-12-16     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  1272646     Medline TA:  Am Fam Physician     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1713-20     Citation Subset:  AIM; IM    
Clinton Memorial Hospital, Wilmington, Ohio, USA.
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MeSH Terms
Acoustic Impedance Tests*
Ear, Middle / physiology*
Otitis Media / diagnosis*
Otoscopy / methods
Physical Examination
Predictive Value of Tests
Sensitivity and Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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