Prehospital Triage Tools across the World: A Scoping Review of the Published Literature
Abstract BackgroundAccurate triage of the undifferentiated patient is a critical task in prehospital emergency care. This scoping review aims to identify published tools used for prehospital triage across the world and describe their performance characteristics.MethodsA comprehensive search was performed of primary literature in English-language journals from 2009 to 2019. Papers included focused on emergency medical services (EMS) triage of single patients. Two blinded reviewers and a third adjudicator performed independent title and abstract screening and subsequent full-text reviews. ResultsOf 1521 unique articles, 55 (3.6%) were included in the final synthesis. The majority of prehospital triage tools focused on stroke (n=19; 35%), trauma (19; 35%), and general undifferentiated patients (15; 27%). All studies, and resulting articles, were performed in high income countries, with the majority in North America (23, 42%) and Europe (22, 40%). 4 (7%) articles focused on the pediatric population. The general triage tools aggregated prehospital vital signs, mental status assessments, and sometimes, features of the history, exam, and anticipated resource need, to categorize patients into numerical or color categories to represent level of acuity. The studies assessed the tools’ ability to accurately predict emergency department triage assignment, hospitalization and short-term mortality. The stroke triage tools were designed to promote rapid identification of patients with acute large vessel occlusion ischemic stroke to trigger timely transport to diagnostically- and therapeutically-capable hospitals. Stroke triage literature evaluates tools’ diagnostic performance, impact on tissue plasminogen activator administration rates, and correlation with in-hospital stroke scales. Trauma triage tools sought to identify patients that require immediate transport to trauma centers with emergency surgery capability. The studies on trauma triage evaluate prediction of trauma center need, under-triage and over-triage rates for major trauma, and survival to discharge.ConclusionsThe published literature on prehospital triage tools predominantly derive from high-income health systems and mostly focus on adult stroke and trauma populations. Most studies sought to further simplify existing triage tools, without sacrificing triage accuracy, or assessed the predictive capability of the triage tool. There was no clear ‘gold-standard’ singular prehospital triage tool for acute undifferentiated patients. Trial RegistrationNot applicable.