COMPARISON OF THE INCIDENCE OF COMBINED RISK-FACTORS FOR GASTRIC-ACID ASPIRATION - INFLUENCE OF 2 ANESTHETIC TECHNIQUES

  • 1 January 1980
    • journal article
    • research article
    • Vol. 59  (11) , 862-864
Abstract
Gastric fluid pH and volume were studied on induction of anesthesia, during maintenance and at the end of the anesthesia in 50 elective surgical patients. All patients were premedicated with meperidine, 1 mg/kg, and atropine, 0.006 mg/kg, administered i.m. 45 min before induction of anesthesia. Of the patients 1/2 had incremental doses of meperidine and 1/2 had enflurane 1-2% all had 70% N2O in O2 during anesthesia maintenance. The incidence of a gastric fluid pH < 2.5 was 68% at the time of induction of anesthesia, 30% after 1 h of anesthesia and 60% at the end of anesthesia. The incidence of a combination of pH < 2.5 and a volume > 25 ml was 30% on induction and 50% at the end of the anesthetic. There was no difference between the results in the 2 groups. There was a decrease of gastric acidity during the anesthetic but, the incidence of risk factors for aspiration pneumonitis at the end of the operation is at least as great as that on induction. Emptyping the stomach before extubation may decrease this risk.

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