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Canadian Journal of Anesthesia, Vol 36, 124-127, Copyright © 1989 by Canadian Anesthesiologists' Society

ARTICLES

Arterial to end-tidal carbon dioxide tension difference during anaesthesia in early pregnancy

KB Shankar, H Moseley, V Vemula, M Ramasamy and Y Kumar
Department of Anaesthesia and Intensive Care, University of West Indies, Queen Elizabeth Hospital, Barbados.

Sixteen patients requiring general anaesthesia for termination of pregnancy by dilatation and evacuation of the uterus were studied. Arterial and end-tidal carbon dioxide tensions were determined during anaesthesia. The mean arterial to end-tidal carbon dioxide tension difference was 0.07 kPa (-0.02-0.16, 5-95 per cent confidence limits). These results were similar to those observed during Caesarean section and those during anaesthesia for post-delivery tubal ligations. The physiological changes such as increased cardiac output, haemodilution, and increased blood volume which manifest by 12 weeks of gestation probably result in a reduced (a-E')PCO2 value.




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Copyright © 1989 by the Canadian Anesthesiologists' Society.