Arterial to end-tidal carbon dioxide difference in children undergoing mechanical ventilation of the lungs during general anaesthesia.

Abstract:

:Capnography (ETCO2 ) is routinely used as a non-invasive estimate of arterial carbon dioxide (PaCO2 ) levels in order to modify ventilatory settings, whereby it is assumed that there is a positive gap between PaCO2 and ETCO2 of approximately 0.5 kPa. However, negative values (ETCO2 > PaCO2 ) can be observed. We retrospectively analysed arterial to end-tidal carbon dioxide differences in 799 children undergoing general anaesthesia with mechanical ventilation of the lungs in order to elucidate predictors for a negative gap. A total of 2452 blood gas analysis readings with complete vital sign monitoring, anaesthesia gas analysis and spirometry data were analysed. Mean arterial to end-tidal carbon dioxide difference was -0.18 kPa (limits of 95% agreement -1.10 to 0.74) and 71.2% of samples demonstrated negative values. The intercept model revealed PaCO2 to be the strongest predictor for a negative PaCO2 -ETCO2 difference. A decrease in PaCO2 by 1 kPa resulted in a decrease in the PaCO2 -ETCO2 difference by 0.23 kPa. This study demonstrates that ETCO2 monitoring in children whose lungs are mechanically ventilated may paradoxically lead to overestimation of ETCO2 (ETCO2 > PaCO2 ) with a subsequent risk of unrecognised hypocarbia.

journal_name

Anaesthesia

journal_title

Anaesthesia

authors

Onodi C,Bühler PK,Thomas J,Schmitz A,Weiss M

doi

10.1111/anae.13969

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

1357-1364

issue

11

eissn

0003-2409

issn

1365-2044

journal_volume

72

pub_type

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