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Capnogram Artifact during High Airway Pressures Caused by a Water Trap

Department of Anesthesiology, University of Florida College of Medicine, Gainesville, Florida.

Abstract

Capnograms are useful in monitoring mechanical ventilation (1). During ventilation with a partially obstructed endotracheal tube resulting in elevated airway pressure (Paw), we recently observed unexpected CO₂ waveforms. The capnogram falsely indicated a brief period of expiration during mechanical inspiration (Fig. 1). A 30-ml water trap between the sampling tube and the capnograph was considered to be the origin of the CO₂ measured during inspiration. This report describes a laboratory investigation of this problem.

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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