JOURNAL HOME CME HOME THIS MONTH PAST ISSUES ETOC COLLECTIONS AUTHORS REVIEWERS EDITORIAL BOARD FEEDBACK RSS HELP
		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a colleague Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Raemer, D. B. Articles by Gabel, R. A. Search for Related Content PubMed PubMed Citation Articles by Raemer, D. B. Articles by Gabel, R. A.

Variation in PCO₂ between Arterial Blood and Peak Expired Gas during Anesthesia

Received from the Department of Anesthesia, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts; and the Department of Anesthesiology, University of Rochester Medical Center, Rochester, New York.

Abstract

Arterial PCO₂ (PaCO₂) can be continuously and noninvasively estimated by monitoring peak expired CO₂ tension (PpeCO₂). The practice of calibrating the estimate by an initial measurement of PaCO₂ assumes that the difference in PCO₂ tension between arterial blood and expired gas P(a-pe)co₂ remains constant. We examined the stability of P(a-pe)CO₂ during anesthesia in 15 patients undergoing major surgery. Mean P(a-pe)CO₂ values ranged from 0.8–7.9 torr with maximum P(a-pe)CO₂ values ranging from 4.5–13.0 ton. Calibration of P(a-pe)CO₂ based on a single initial measurement of PaCO₂ often over- or underestimated PaCO₂. Mean estimated PaCO₂ from calibrated P(a-pe)CO₂ varied from - 7.9–6.4 torr with extreme estimates of — 12.8–12.3 torr. No consistent correlation was shown between P(a-pe)CO₂ and duration of anesthesia, variations in ventilation, blood pressure, blood-gas tensions, PpeCO₂ or temperature. We conclude that estimation of PaCO₂ by monitoring PpeCO₂ is not invariably reliable.

Key Words: CARBON DIOXIDE: tension • VENTILATION: carbon dioxide tension.

This article has been cited by other articles:

				T. F. Morley Capnography in the Intensive Care Unit J Intensive Care Med, September 1, 1990; 5(5): 209 - 223. [Abstract] [PDF]

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