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The predictive value of tympanometry in the diagnosis of middle ear effusion
G W Watters1, J E Jones, A P Freeland
1Department of Otolaryngology, Radcliffe Infirmary, Oxford, UK.
Insights
Tympanometry accurately identifies middle ear effusion before surgery. Preoperative tympanometry results can help reassess the need for middle ear surgery in children.
Area of Science:
- Otolaryngology
- Pediatric Surgery
- Diagnostic Imaging
Background:
- Middle ear effusion (MEE) is a common condition in children.
- Surgery is often considered for persistent MEE, but accurate diagnosis is crucial.
Purpose of the Study:
- To evaluate the diagnostic accuracy of tympanometry in predicting middle ear effusion.
- To correlate tympanometry results with surgical findings in pediatric patients.
Main Methods:
- A prospective study involving 501 children (11 months to 15 years) undergoing surgery for suspected MEE.
- Tympanometry was performed within 2 hours of surgery, with results correlated to 955 surgical ears.
Main Results:
- Type-B tympanograms showed high sensitivity (0.91) for MEE, while Type-A had high specificity (0.99) for a dry middle ear.
- Type-A tympanograms had high positive (0.91) and negative (0.84) predictive values.
- Adding Type-C tympanograms improved dry middle ear prediction sensitivity to 0.79; peaked tympanograms (Type-A or -C) had a 0.71 positive predictive value for a dry middle ear.
Conclusions:
- Tympanometry is the optimal clinical test for detecting middle ear effusion.
- Preoperative tympanometry can guide decisions regarding the necessity of middle ear surgery in pediatric patients.
Abstract:
Over a 12-month period 501 children (age range 11 months to 15 years) underwent surgery for a possible middle ear effusion. All had tympanometry performed within 2 h of surgery. The results of tympanometry were correlated with the surgical findings in 955 ears. A type-B tympanogram has a high sensitivity (0.91) in predicting middle ear effusion with good specificity (0.79). A type-A tympanogram has a very high specificity (0.99) in predicting a dry middle ear but low sensitivity (0.34). Both the positive (0.91) and negative (0.84) predictive values of a type-A tympanogram are high. The addition of a type-C tympanogram increases the sensitivity of predicting a dry middle ear to 0.79. The positive predictive value of a peaked (type-A or -C) tympanogram is 0.71 and should be considered strong evidence that the middle ear is dry. Tympanometry is the best clinical test for the presence or absence of a middle ear effusion, and on the basis of preoperative tympanometry alone the need for surgery should be carefully reassessed.
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