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Related Experiment Videos

[The recent trend in preoperative fasting]

J Kawasaki1, T Kawazoe

  • 1Department of Anesthesiology, Saitama Medical Center, Saitama Medical School, Kawagoe.

Masui. the Japanese Journal of Anesthesiology
|August 1, 1995
PubMed
Summary

Patients can safely drink clear fluids until 2-3 hours before anesthesia. This study found no significant difference in gastric volume or pH, supporting reduced preoperative fasting times for clear liquids.

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Area of Science:

  • Anesthesiology
  • Gastroenterology
  • Patient Safety

Context:

  • Traditional preoperative fasting guidelines recommend 4-6 hours without food or water.
  • Recent anesthesiology trends and guidelines suggest allowing clear fluid intake closer to anesthesia induction.
  • The study addresses the safety and efficacy of modified preoperative fasting protocols.

Purpose:

  • To compare the effects of absolute preoperative fasting versus allowing clear fluid intake until 2-3 hours before anesthesia.
  • To monitor residual gastric volume and pH in patients undergoing anesthesia under different fasting protocols.
  • To evaluate the impact of reduced fasting times on patient safety concerning gastric contents.

Summary:

  • This study compared two preoperative fasting protocols: 6-hour absolute fasting versus 6-hour fasting with clear fluids allowed until 2 hours before anesthesia.
  • Residual gastric volume and pH were measured immediately after anesthesia induction in age-matched patient groups.
  • No significant differences in gastric volume or pH were observed between the two groups across all age ranges.

Impact:

  • The findings support current anesthesiology concepts regarding preoperative fasting, indicating that allowing clear fluids closer to surgery is safe.
  • Reducing preoperative fasting times by permitting clear fluid intake may not increase the risk of pulmonary aspiration.
  • The study recommends a practical approach of withholding solid foods for 6 hours while allowing clear fluids until 2-3 hours before anesthesia.

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