Emergency Severity Index
The Emergency Severity Index (ESI) is a five-level emergency department (ED) triage algorithm that provides clinically relevant stratification of patients into five groups from 1 (most urgent) to 5 (least urgent) on the basis of acuity and resource needs. The Agency for Healthcare Research and Quality (AHRQ) funded initial work on the ESI. The ESI differs from the standardized triage algorithms used in several other countries, like the Australasian Triage Scale, in being based on identifying interventions required instead of a permissible wait time. ESI category 1 patients require "immediate life-saving interventions", like mechanical ventilation, control of major bleeding, and cardioversion.
Gilboy N, Tanabe T, Travers D, Rosenau AM. (2011). Emergency Severity Index (ESI): A Triage Tool for Emergency Department Care, Version 4. Implementation Handbook 2012 Edition.. AHRQ. ISBN 978-1-58763-416-1.
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