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Anesth Analg 1986; 65:667-671
© 1986 International Anesthesia Research Society
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Endotracheal Tube Leak Pressure and Tracheal Lumen Size in Swine

David A. Finholt, MD, Steven M. Audenaert, MD, Joseph A. Stirt, MD, Kenneth L. Marcella, DVM, Henry F. Frierson, Jr, MD, Larry T. Suddarth, and Russell C. Raphaely, MD

Received from the Departments of Anesthesiology, Pediatrics, Comparative Medicine, and Pathology, University of Virginia, and Departments of Anesthesiology and Pediatrics, University of Pennsylvania.

Abstract

Endotracheal tube "leak" is often estimated in children to judge the fit of uncuffed endotracheal tubes within the trachea. Twenty-five swine were intubated with uncuffed tracheal tubes to determine whether a more sensitive measurement of leaks could be devised and whether leak pressure estimates fit between tracheal tube and trachea. We compared leak pressure measurement using a stethoscope and aneroid manometer with a technique using a microphone, pressure transducer, and recorder, and found no differences between the two methods. The tracheas were then removed and slides prepared of tracheal cross-sectional specimens. Regression analysis revealed a linear relationship between tracheal lumen size and tracheal tube size for both low leak pressure (y = –0.4 + 0.79x, r = 0.88, P < 0.05) and high leak pressure (y = –2.9 + 0.71x, r = 0.92, P < 0.05) groups. We conclude that leak testing with a stethoscope and aneroid manometer is sensitive and accurate, and that tracheal tube leak pressure accurately portrays fit between tube and trachea.

Key Words: INTUBATION—tracheal • EQUIPMENT, TUBES—tracheal




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1986 by the International Anesthesia Research Society.