Multi-Evidence Clinical Reasoning With Retrieval-Augmented Generation for Emergency Triage: Retrospective Evaluation Study

A dual‑source RAG triage system that combines guideline‑based rules with case‑based reasoning achieved expert‑comparable agreement, reduced overtriage, and better aligned urgency assignments than a prompt‑only baseline LLM. Secondary outcome-based analyses in this cohort suggested more favorable triage patterns than initial nurse triage, supporting MECR‑RAG as a concurrent decision‑support layer that flags discordant or high‑risk assignments; prospective multicenter implementation studies are needed to determine effects on emergency department crowding, delays, and patient outcomes.