Perioperative NPO and Tube Feeding Resident Handout
Applies to: trauma/SICU perioperative planning. Key principle: intubated/trach-cuffed patients have a protected airway; avoid unnecessary starvation.
1) Standard Oral Fasting Windows
| Intake Type | Minimum Fast |
|---|---|
| Clear liquids | 2 hours |
| Light meal | 6 hours |
| Full/fatty meal | 8 hours |
2) Enteral Tube Feeding Rules
| Airway Status | Gastric Feeds (NG/OG/G/PEG) | Post-Pyloric Feeds (NJ/DHT/J) |
|---|---|---|
| Intubated or cuffed trach (protected airway) | Continue until called to OR | Continue until called to OR |
| Not intubated (no protected airway) | Hold 6 hours pre-procedure | Hold 6 hours pre-procedure |
Hold feeds regardless of airway status
- GI surgery.
- Airway surgery.
- Proning plan.
Post-op restart
- Non-GI operations: restart at prior plan when clinically appropriate.
- GI operations: restart per surgical team plan.
3) GLP-1 Perioperative Workflow (2024 Multi-Society Update)
Step 1: identify agent
- Weekly: semaglutide, tirzepatide, dulaglutide, exenatide ER.
- Daily: liraglutide, oral semaglutide, lixisenatide.
Step 2: symptom screen
Ask for nausea, vomiting, bloating, abdominal discomfort.
Branching plan
| Screen Result | Pre-op Plan |
|---|---|
| No GI symptoms | Continue GLP-1, use standard fasting windows |
| GI symptoms present | Continue GLP-1, clear liquids for 24h, treat as higher aspiration risk (RSI/full-stomach precautions) |
Risk modifier
- Dose-escalation phase (first 4-8 weeks or after dose increase) has higher GI symptom risk.
If gastric ultrasound is used (symptomatic branch)
- Residual >1.5 mL/kg: maintain full-stomach/RSI strategy and document.
- Empty stomach: proceed per anesthesia attending judgment.
4) Urgent/Emergent Cases
- Treat as full stomach.
- Use RSI and aspiration precautions.
- Do not delay for elective fasting windows.
5) Documentation Requirements
- Airway status at decision time.
- Feed route + hold/continue decision + reason.
- GLP-1 use and GI symptom screen result.
- Any deviation from baseline pathway with rationale.
6) Hard Stops
- Do not apply blanket NPO rules to intubated ICU patients.
- Do not hold all GLP-1 agents reflexively without symptom assessment.
- Do not skip documenting rationale for exceptions.
- Do not delay urgent surgery to satisfy elective fasting windows.
7) Quick Execution Card
- Intubated + non-GI/non-airway/non-proning: feeds continue until called to OR.
- Not intubated + any tube feeds: hold 6h.
- GLP-1 no symptoms: continue medication + standard fasting.
- GLP-1 with symptoms: clear liquids x24h + aspiration-risk pathway.
Source Basis
Condensed from active institutional NPO/perioperative feeding guideline (effective November 2025, anesthesia-approved).