A healthy 32-year-old is to have a wisdom tooth extraction under IV sedation as a day-surgery patient. He ate a heavy meal 3 hours ago. Which statement BEST reflects the application of ASA NPO guidelines?
- A Proceed with light sedation only — NPO guidelines do not apply to moderate sedation
- B Metoclopramide 10 mg IV can substitute for adequate fasting and allow immediate procedure
- C The procedure should be postponed until 6 hours have elapsed from the last solid food meal ✓
- D Antacids given 30 minutes before procedure fully mitigate aspiration risk from recent meal
Correct answer: C. The procedure should be postponed until 6 hours have elapsed from the last solid food meal
Explanation
ASA NPO guidelines apply to patients receiving any level of sedation or anaesthesia. Solids require ≥6 hours of fasting (8 hours for fatty foods); clear liquids require ≥2 hours. Elective day-surgery procedures should be postponed when fasting criteria are not met to reduce pulmonary aspiration risk. Pharmacological prophylaxis (metoclopramide, H2 blockers, antacids) reduces aspiration severity but does NOT replace adequate fasting and cannot guarantee gastric emptying. This applies regardless of sedation depth because patients may unexpectedly deepen.
Reference: Morgan & Mikhail's Clinical Anesthesiology, 6th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.