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Journal of Speech and Hearing Research Vol.35 936-941 August 1992.
© American Speech-Language-Hearing Association
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Equivalent Ear Canal Volumes in Children Pre- and Post-Tympanostomy Tube Insertion

Janet E. Shanks 1
Patricia G. Stelmachowicz 2
Kathryn L. Beauchaine 2

Laura Schulte 2
1 VA Medical Center Long Beach, California and University of California, Irvine
2 Boys Town National Research Hospital Omaha, NE

Pre- and postoperative equivalent ear canal volume measures were obtained from a group of 334 children ranging in age from 6 weeks to 6.7 years. The purpose of the study was to develop volumetric guidelines for the determination of tympanostomy tube patency. For children 4 years and older, almost no ambiguity existed in making this determination accurately. For younger children, the pre- and postoperative distributions overlap. A criterion value of ge1.0 cm3 as an indicator of a tympanic membrane perforation appears to yield the lowest possible error rate. When both pre- and postoperative measures are available, a difference of ge0.4 cm3 can be used in conjunction with the absolute value to identify a patent tympanostomy tube.

KEY WORDS: acoustic admittance, tympanostomy tubes, equivalent volume, children

Submitted on October 17, 1991
Accepted on December 26, 1991


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