Decreasing NPO Times for Pediatric Patients

Traditional preoperative fasting, also known as “nil per os” (NPO), is a longstanding practice aimed at reducing the risk of pulmonary aspiration while under anesthesia. However, studies have increasingly shown that prolonged fasting times in pediatric patients are both unnecessary and potentially harmful. Children are more vulnerable than adults to the adverse effects of fasting, including dehydration, hypoglycemia, irritability, and hemodynamic instability. Recent evidence and professional guidelines now support decreasing NPO times from traditional thresholds for pediatric patients to promote comfort and metabolic stability.

The American Society of Anesthesiologists (ASA) has recommended a fasting period of six hours for solid foods, four hours for breast milk, and two hours for clear liquids. However, more recent data demonstrate that gastric emptying of clear fluids in healthy children occurs rapidly—often within 30 to 60 minutes—and that the volume of gastric contents after a one-hour fast is clinically negligible. In a multicenter review, Thomas et al. found that allowing clear fluids up to one hour before anesthesia was not associated with an increased risk of aspiration or regurgitation in elective pediatric procedures (1). These findings align with a growing body of literature suggesting that more liberal fasting guidelines can safely replace traditional regimens.

Prolonged fasting can negatively impact perioperative physiology and the patient experience. A prospective observational study by Aroonpruksakul et al. found that the median fasting time for clear fluids among pediatric surgical patients was over ten hours, even when standard preoperative instructions were followed (2). The children in the study reported significant thirst and discomfort, and some demonstrated signs of dehydration and irritability. Such extended fasting often results from scheduling delays, conservative NPO orders, and a lack of individualized timing based on surgery start times.

Quality improvement initiatives decreasing NPO times for pediatric patients have demonstrated clear benefits. Carroll and colleagues implemented a hospital-wide intervention using standardized documentation and communication tools to specify NPO cutoffs more accurately (3). This change reduced the average clear-fluid fasting time from over ten hours to just over six hours with no reported cases of aspiration or procedure cancellations. Similarly, the updated European Society of Anesthesiology and Intensive Care guidelines recommend allowing the consumption of clear fluids up to one hour before anesthesia and breast milk up to three hours prior to anesthesia, emphasizing patient comfort and safety in the modern perioperative setting (4).

Shortening NPO intervals not only enhances the patient experience but may also improve physiological outcomes. Zhang et al. note that shorter fasting reduces ketone production, preserves blood glucose levels, and promotes cardiovascular stability during induction (5). Importantly, these benefits come without an increase in perioperative complications when applied to healthy children undergoing elective surgery.

Decreasing NPO times for pediatric patients from conservative guidelines is a safe and evidence-based evolution of anesthesia practice. Allowing clear fluids up to one hour before induction and breast milk up to three hours beforehand supports patient well-being and clinical efficiency. Although implementing these updated protocols requires multidisciplinary coordination, the result is improved comfort, satisfaction, and safety for children undergoing surgery.

References

1. Thomas M, Morrison C, Newton R, Schindler E. Consensus statement on clear fluids fasting for elective pediatric general anesthesia. Paediatr Anaesth. 2018;28(5):411-414. doi:10.1111/pan.13370

2. Aroonpruksakul N, Punchuklang W, Kasikan K, et al. The actual duration of preoperative fasting in pediatric patients, and its effects on hunger and thirst: a prospective observational study. Transl Pediatr. 2023;12(2):146-154. doi:10.21037/tp-22-358

3. Carroll AR, McCoy AB, Modes K, et al. Decreasing pre-procedural fasting times in hospitalized children. J Hosp Med. 2022;17(2):96-103. doi:10.1002/jhm.12782

4. Frykholm P, Disma N, Andersson H, et al. Pre-operative fasting in children: A guideline from the European Society of Anaesthesiology and Intensive Care. Eur J Anaesthesiol. 2022;39(1):4-25. doi:10.1097/EJA.0000000000001599

5. Zhang E, Hauser N, Sommerfield A, Sommerfield D, von Ungern-Sternberg BS. A review of pediatric fasting guidelines and strategies to help children manage preoperative fasting. Paediatr Anaesth. 2023;33(12):1012-1019. doi:10.1111/pan.14738