Equivalent Ear Canal Volumes in Children Pre- and Post-Tympanostomy Tube Insertion 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 ... Research Article
Research Article  |   August 01, 1992
Equivalent Ear Canal Volumes in Children Pre- and Post-Tympanostomy Tube Insertion
 
Author Affiliations & Notes
  • Janet E. Shanks
    VA Medical Center Long Beach, California and University of California, Irvine
  • Patricia G. Stelmachowicz
    Boys Town National Research Hospital Omaha, NE
  • Kathryn L. Beauchaine
    Boys Town National Research Hospital Omaha, NE
  • Laura Schulte
    Boys Town National Research Hospital Omaha, NE
Article Information
Hearing Disorders / Hearing / Research Articles
Research Article   |   August 01, 1992
Equivalent Ear Canal Volumes in Children Pre- and Post-Tympanostomy Tube Insertion
Journal of Speech, Language, and Hearing Research, August 1992, Vol. 35, 936-941. doi:10.1044/jshr.3504.936
History: Received October 17, 1991 , Accepted December 26, 1991
 
Journal of Speech, Language, and Hearing Research, August 1992, Vol. 35, 936-941. doi:10.1044/jshr.3504.936
History: Received October 17, 1991; Accepted December 26, 1991

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 ≥1.0 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 ≥0.4 cm3 can be used in conjunction with the absolute value to identify a patent tympanostomy tube.

Acknowledgments
The authors acknowledge Michael Gorga, Lee Harker, and Richard Wilson for many helpful comments on an earlier version of this manuscript, and Betsy From for assistance with manuscript preparation.
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