## Pre-operative Fasting and Medication Management **Key Point:** Once the minimum fasting period has been met, no additional oral intake (including water) is permitted immediately before induction of anesthesia, regardless of patient anxiety or thirst. ### ASA Fasting Guidelines — Clear Fluids | Scenario | Fasting Duration | Rationale | |---|---|---| | Clear fluids only | 2 hours | Rapid gastric emptying | | Small sip of water with medication | Counts toward fasting period | Minimal volume; does not restart clock | | Large volume of fluid | Restarts 2-hour clock | Delays gastric emptying | **High-Yield:** A "sip of water" to swallow medication is a **permitted exception** and does NOT reset the fasting clock. The patient fasted from midnight (12:00 AM) and took metformin + sip at 07:00 AM. By 08:00 AM (1 hour later), he has already exceeded the 2-hour clear fluid requirement. ### Why No Additional Fluid Now? 1. **Fasting requirement already met:** 8 hours have elapsed since midnight (solid food) and 1 hour since the last sip (clear fluid). 2. **Gastric volume risk:** Allowing fluid immediately before induction increases gastric volume and aspiration risk. 3. **Anxiety management:** Anxiety is better managed with reassurance, anxiolytic premedication (e.g., midazolam IV during IV access), or regional anesthesia options—not oral fluids. **Clinical Pearl:** Patient anxiety about fasting is common but should NOT override fasting guidelines. Reassurance and appropriate premedication are the standard approach. ### Correct Action Inform the patient that fasting guidelines have been met and no further oral intake is permitted. Proceed with surgery as scheduled. Offer IV anxiolytic if needed.
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