Factors affecting ¹³C-natural abundance measurement of breath carbon dioxide during surgery: absorption of carbon dioxide during endoscopic procedures

Simon Eaton, Maurizio Pacilli, James Wood, Merrill McHoney, Lucia Corizia, Charlotte Kingsley, Joseph I. Curry, Jane Herod, Ralph Cohen, Agostino Pierro

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The aim of this paper is to review the factors which may affect breath ¹³CO2/¹²CO2 natural abundance in patients undergoing surgery or intensive care. Intravenous glucose administration is a major determinant of the ¹³CO2/ ¹²CO2 of breath as intravenous glucose preparations are almost all derived from cornstarch. In addition, the oxidation of endogenous substrates can affect the ¹³CO2/¹²CO 2 ratio. During many endoscopic procedures, such as laparoscopic surgery, carbon dioxide insufflation is used to provide a working space. As medical CO2 is relatively depleted in ¹³CO2 compared with endogenous and exogenous metabolic CO2 sources, breath ¹³CO2/¹²CO2 measurements can be used to estimate CO2 absorption during these procedures. However, all these factors may also be affected by the bicarbonate pool, making a definitive attribution of changes in breath ¹³CO2/ ¹²CO2 to a single factor problematic.
Original languageEnglish
Pages (from-to)1759-1762
Number of pages4
JournalRapid Communications in Mass Spectrometry
Volume22
Issue number11
DOIs
Publication statusPublished - 2008
Externally publishedYes

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