• Dong Hyun Choi, Won Pyo Hong, Kyoung Jun Song, Tae Han Kim, Sang Do Shin, Ki Jeong Hong, Jeong Ho Park, and Joo Jeong.
• Department of Emergency Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
• Yonsei Med. J. 2021 Dec 1; 62 (12): 1145-1154.

PurposeThe objective of this study was to modify and validate an emergency department (ED) triage system with improved prediction performance on hospital outcomes by modifying the Korean Triage and Acuity Scale (KTAS).Materials And MethodsWe performed a retrospective observational study at three academic universities in South Korea. The KTAS code, determined by the chief complaint and the selected modifier of a patient, was used to derive the Modified KTAS (MKTAS). We calculated the area under the receiver operating characteristics curve (AUC) and the test characteristics to evaluate the performance of MKTAS to predict hospital mortality, critical outcome, and admission.ResultsA total of 272402 and 128831 ED visits were used for the derivation and validation of MKTAS, respectively. Compared to KTAS, MKTAS had significantly higher AUC values for the prediction of hospital mortality [MKTAS 0.826 (0.818-0.835) vs. KTAS 0.794 (0.784-0.803)], critical outcome [MKTAS 0.836 (0.830-0.841) vs. 0.798 (0.792-0.804)], and admission [MKTAS 0.725 (0.723-0.728) vs. KTAS 0.685 (0.682-0.688)]. The sensitivity for predicting hospital mortality and critical outcome, as well as the specificity for predicting admission, were significantly improved.ConclusionMKTAS was derived by modifying the KTAS, and then validated. Compared with KTAS, MKTAS showed better discriminating ability to predict hospital outcomes. Continuous efforts to evaluate and modify widely used triage systems are required to improve their performance.© Copyright: Yonsei University College of Medicine 2021.

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