Post-anaphylaxis observation in the ED: a decade of data challenging the traditional 24-hour rule - PubMed
7 hours ago
- #anaphylaxis
- #risk-stratification
- #emergency-medicine
- The traditional 24-hour observation rule for anaphylaxis is being challenged by a decade of data.
- Biphasic anaphylaxis often occurs after 4–6 hours, making short 2–4 hour ED observation insufficient.
- Key risk factors for biphasic reactions include severe initial presentation, need for multiple epinephrine doses, and delayed epinephrine.
- Risk-stratified approaches are recommended, with high-risk patients needing prolonged observation (≥6 hours) or admission.
- A low-risk pathway may allow shorter observation if paired with thorough discharge education.
- Observation of 6–12 hours aligns with NICE guidance and has a high negative predictive value (>98% after 8–12 hours).
- Future research should focus on prospective, multicenter registries to refine observation strategies.