Should Procedural Sedation Be Delayed Due to Fasting Time?
Procedural sedation should NOT be delayed due to fasting time, as recent food intake is not a contraindication for administering procedural sedation and analgesia in the emergency department. 1
Key Evidence from ACEP Guidelines
The American College of Emergency Physicians' clinical policy explicitly addresses this question with clear guidance:
There is no compelling evidence that mandates specific time frames for presedation fasting for either solids or liquids in emergency department procedural sedation 1
The risk of aspiration during ED procedural sedation and analgesia appears to be extremely low 1
In a prospective observational study of 1,014 patients, 56% were not fasted, yet there was no difference in adverse events between fasted and unfasted groups 1
Only 1 out of 282 nonfasted patients (0.4%) experienced vomiting, compared to 1 out of 118 fasted patients (0.8%) 1
Does This Apply to All Sedation Depths?
The recommendation applies broadly to procedural sedation in the ED, regardless of whether moderate or deep sedation is achieved. 1 The guideline does not differentiate fasting requirements based on sedation depth for emergency procedures, which distinguishes ED procedural sedation from elective operating room general anesthesia.
Pediatric Considerations
Pediatric patients follow the same evidence-based approach as adults—fasting is not required. 1, 2
Studies in children aged 1-14 years showed no significant difference in gastric pH and gastric volumes between patients fasted for 2,4, or 12 hours preoperatively 1
In a prospective study of 1,180 pediatric patients undergoing ED procedural sedation, the adverse event rate was only 2.3% with no serious complications, regardless of fasting status 1
Drinking clear fluids up to 3 hours before procedures has no significant effect on gastric volume or gastric pH in children 1
Why Fasting Doesn't Reduce Risk
The fundamental assumption that fasting reduces aspiration risk in ED procedural sedation lacks evidence:
Fasting time does not reduce the risk of emesis or aspiration during procedural sedation 3, 4, 5
Among 4,657 adult cases and 17,672 pediatric cases reviewed, there was only one reported case of pulmonary aspiration during emergency procedural sedation 5
The aspiration risk is expected to be lower in procedural sedation than in general anesthesia because airway reflexes are typically preserved 4
Critical Caveat
While routine fasting is not required, selected patients believed to be significantly more prone to aspiration may benefit from individual risk-benefit assessment prior to sedation 5. However, this should not routinely delay necessary emergency procedures.