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Canadian Journal of Anesthesia, Vol 25, 36-39, Copyright © 1978 by Canadian Anesthesiologists' Society

Gastric Volume and pH in Out-Patients

BILL Y. ONG 1, RICHARD J. PALAHNIUK 1, and MAUREEN CUMMING 1

1 Department of Anaesthesia, University of Manitoba, Health Sciences Centre, 700 William Ave., Winnipeg, Manitoba, Canada, R3E 0Z3

We measured the volume and pH of the gastric content of 21 out-patients and 21 in-patients under general anaesthesia. Gastric tubes were inserted after induction of anaesthesia, and gastric fluids were withdrawn for pH determinations. Gastric volumes were measured by a dilution technique using polyethylene glycol as the indicator and also by measurement of the volume aspirated through a gastric tube. Out-patients had a mean gastric volume of 69 ± 17 ml while inpatients had a mean volume of 33 ± 4 ml. The average gastric pH for the out-patients was 1.8 ± 0.2 and for the in-patients 2.0 ± 0.3. Four out-patients had more than 75 ml of gastric fluid of pH less than 2.0. Aspiration through a gastric tube did not empty the stomach completely and the volume thus obtained gave a falsely low estimate of the gastric volume.






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Copyright © 1978 by the Canadian Anesthesiologists' Society.