PEDIATRICS Vol. 69 No. 3 March 1982, pp. 351-354
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Modified Schema for Classifying Positive-Pressure Tympanograms

Clyde G. Smith MS1, Jack L. Paradise MD1, and Tina I. Young BA1

1 Departments of Pediatrics and Community Medicine, University of Pittsburgh School of Medicine, and Ambulatory Care Center, Children's Hospital of Pittsburgh, Pittsburgh

Tympanograms with peaks located in the high-positive air pressure range (ge 50 mm H2O) are infrequently recorded in clinical practice and have been little discussed in the literature. Such tympanograms accounted for 1.2% of a series of 8,011 tympanograms recorded at various times from 1,556 subjects ranging in age from 7 months through 12 years. Correlations between otoscopic diagnoses and tympanometric findings in the case of 65 of the high-positive air pressure tympanograms form the basis of the present report. Of the 65 high-positive air pressure tympanograms, 51 showed relatively high compliance (le5.5 Madsen units), and of these 46 (90%) were associated with ears considered normal otoscopically. Fourteen of the high-positive air pressure tympanograms showed low compliance (>5.5 Madsen units), and of these, six (43%) were associated with ears considered normal, six (43%) with ears showing signs of acute infection, and two (14%) with ears in which the presence of effusion seemed probable. A previously presented zonal schema for classifying tympanograms has been modified on the basis of these findings.

Submitted on December 3, 1979
Accepted on May 21, 1981




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