Key result
Administering 150 ml of water 2 hours before surgery, with or without intramuscular morphine, significantly decreased residual gastric volume compared to overnight fasting (p<0.05).
Why the study?
Does oral fluid intake 2 hours before surgery, with or without premedication, affect residual gastric volume and pH in elective surgical patients?
Population
150 elective surgical patients, ASA physical status 1 and 2
Comparison
150 ml water 2 hours before the scheduled time… vs Continued overnight fast (control group)
Design
RCT, Randomly assigned to one of the three groups of 50 each
Follow-up
Immediately after induction of anaesthesia
Authors
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Supports liberalized clear-fluid fasting in elective surgery; extends RCT evidence to include morphine premedication.
RCT (n=150)
Randomized (3 groups)
Does oral fluid intake 2 hours before surgery, with or without premedication, affect residual gastric volume and pH in elective surgical patients?
p-value: p=<0.05
Allowing 150 ml of water 2 hours before elective surgery significantly decreases residual gastric volume compared to overnight fasting, and is safe even when followed by intramuscular morphine.
Agarwal et al. (1989) conducted an RCT in Elective surgery (n=150). Water with or without morphine and promethazine vs. Overnight fast was evaluated on Residual gastric volume and pH (p=<0.05). Administering 150 ml of water 2 hours before surgery, with or without intramuscular morphine, significantly decreased residual gastric volume compared to overnight fasting (p<0.05).
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