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Canadian Journal of Anesthesia, Vol 29, 12-15, Copyright © 1982 by Canadian Anesthesiologists' Society

Arterial to End-Tidal Carbon Dioxide Tension Difference in Children under Halothane Anaesthesia

NIELS VALENTIN 1, BJARNE LOMHOLT 1, and MAJA THORUP 1

1 Department of Anaesthesia, Gentofte Hospital, DK 2900 Hellerup, Denmark

Using blood gas determinations and capnography, the relationship between arterial and end-tidal Pco2 was investigated in 20 children under halothane anaesthesia with spontaneous respiration. A median arterial to end-tidal carbon dioxide tension difference of 0.66 kPa (5 mm Hg) was found. There was a close correlation between Pacoco2 and the magnitude of the carbon dioxide difference. Our findings may largely be explained by an increase in VD/VT (presumably mainly due to a reduction of Vt) causing admixture of dead space air throughout expiration. It is concluded that though end-tidal carbon dioxide does not exactly reflect PaCOCO2 capnography may be of value as a monitor of respiration in paediatric anaesthesia at normal or near-normal values of end-tidal carbon dioxide.

Key Words: ANAESTHESIA, paediatric • CARBON DIOXIDE TENSION, arterial, end-tidal






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Copyright © 1982 by the Canadian Anesthesiologists' Society.