Factors affecting 13C-natural abundance measurement of breath carbon dioxide during surgery: absorption of carbon dioxide during endoscopic procedures.
The aim of this paper is to review the factors which may affect breath (13)CO(2)/(12)CO(2) natural abundance in patients undergoing surgery or intensive care. Intravenous glucose administration is a major determinant of the (13)CO(2)/(12)CO(2) of breath as intravenous glucose preparations are almost all derived from cornstarch. In addition, the oxidation of endogenous substrates can affect the (13)CO(2)/(12)CO(2) ratio. During many endoscopic procedures, such as laparoscopic surgery, carbon dioxide insufflation is used to provide a working space. As medical CO(2) is relatively depleted in (13)CO(2) compared with endogenous and exogenous metabolic CO(2) sources, breath (13)CO(2)/(12)CO(2) measurements can be used to estimate CO(2) absorption during these procedures. However, all these factors may also be affected by the bicarbonate pool, making a definitive attribution of changes in breath (13)CO(2)/(12)CO(2) to a single factor problematic.
Eaton
Simon
S
Department of Surgery, Institute of Child Health and Great Ormond Street Hospital for Children, London, UK. s.eaton@ich.ucl.ac.uk
Pacilli
Maurizio
M
Wood
James
J
McHoney
Merrill
M
Corizia
Lucia
L
Kingsley
Charlotte
C
Curry
Joseph I
JI
Herod
Jane
J
Cohen
Ralph
R
Pierro
Agostino
A
D000042:Absorption; D001944:Breath Tests / Q000379:methods; D002245:Carbon Dioxide / Q000737:chemistry / Q000493:pharmacokinetics*; D002247:Carbon Isotopes; D004724:Endoscopy; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods
D002247:Carbon Isotopes; D002245:Carbon Dioxide