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British Journal of Anaesthesia, 1991, Vol. 66, No. 1 48-52
© 1991 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

INGESTION OF CLEAR FLUIDS IS SAFE FOR ADOLESCENTS UP TO 3 H BEFORE ANAESTHESIA

W. M. SPLINTER, B.SC. (ENG.), M.D., F.R.C.P. (C.)* and J. D. SCHAEFER, M.D., F.R.C.S. (C.)

Department of Anaesthesia, University of Ottawa Ottawa, Ontario, Canada
Department of Surgery, University of Ottawa Ottawa, Ontario, Canada

*Present address for correspondence: Department of Anaesthesia, Children's Hospital of Eastern Ontario, 401 Smyth Rd, Ottawa, Ontario, Canada K1H 8L1.

We have studied the effect of ingestion of unlimited clear fluids by adolescents up to 3 h before anaesthesia to determine the effect this fluid ingestion would have on thirst, hunger and gastric contents at induction of anaesthesia. We studied prospectively 152 adolescents (ages 13–19 yr) undergoing elective surgery. Fifty percent of the patients had nothing by mouth after midnight. The other 50% were instructed to ingest unlimited clear fluids up to 3 h before surgery. On arrival in the operating room, subjects were asked to assess thirst and hunger with a linear analogue scale of 0–10 (O corresponding to no thirst or no hunger). After induction of anaesthesia, gastric contents were aspirated via a 16-French gauge orogastric tube. Gastric fluid volume (GV) was measured with a syringe and gastric pH (GpH) was assessed with Merck pH strips. GV, GpH and subject hunger were unaffected by ingestion of clear fluids. Subject thirst was reduced by clear fluids. It is concluded that unlimited clear fluid ingestion by healthy adolescents up to 3 h before operation decreases thirst and does not affect gastric contents.


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