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Anesth Analg 1988; 67:884-886
© 1988 International Anesthesia Research Society
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Ventilatory Frequency Influences Accuracy of End-Tidal CO2 Measurements Analysis of Seven Capnometers

Robert P. From, DO, and Franklin L. Scamman, MD

Received from the Department of Anesthesia, University of Iowa College of Medicine, Iowa City, Iowa.

An accurate high-frequency response is mandatory when end-tidal CO2 (PETCO2) is monitored during pediatric general anesthesia. The purpose of this study was to assess the accuracy of six infrared-based capnometers and one multiplexed mass spectrometer available at our institution at increasing frequency. Capnometers studied were the Data-scope Accucap, Hewlett-Packard 47210A capnometer, Narkomed 3 Capnomed, Novametrix Capnogard model 1250, Perkin-Elmer Advantage, Puritan-Bennett Datex CO2 monitor, and Traverse Medical Monitor model 2200 capnometer. Changes in CO2 concentration were generated by a solenoid valve switching between 100% O2, and 7% CO2, in O2, Frequencies, 8–101 cycles/min were chosen to stimulate a range that might be generated by children during general endotracheal anesthesia. At every rate the displayed PETCO2 was recorded. Differences in displayed PETCO2, from known CO2 ranged from –16.4 to + 6.6. At or below frequencies of 31 cycles/min, four capnometers over-reported and three underreported PETCO2. At frequencies above 31 cycles/min, six capnometers underreported and one over-reported PETCO2. Errors may be clinically significant if they influence ventilator settings for patients.

Key Words: EQUIPMENT—capnometers • Monitoring—capnometry • MEASUREMENT TECHNIQUES—capnometry • CARBON DIOXIDE—measurement




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[Abstract] [Full Text] [PDF]


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 © 1988 by the International Anesthesia Research Society.