• Youn-Jung Kim, Chang Hwan Sohn, Dong Woo Seo, Bum Jin Oh, Kyoung Soo Lim, and Won Young Kim.
• Department of Emergency Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
• Acad Emerg Med. 2019 Jan 1; 26 (1): 60-67.

ObjectivesObjective screening tool for patients at a high risk of developing acute brain injury (ABI) is necessary for the proper treatment of carbon monoxide (CO) poisoning patients. The aim of this study is to identify clinical factors that could predict ABI due to CO poisoning in patients with an altered mental status.MethodsA prospectively collected CO poisoning registry at a single academic medical center was retrospectively analyzed. CO poisoning patients with an altered mental status at the emergency department, defined as unalert on the alert/responsive to voice/responsive to pain/unresponsive scale and underwent diffusion-weighted magnetic resonance imaging (DW-MRI) between January 1, 2013, and December 31, 2015, were included. ABI was defined as the presence of acute hypoxic brain lesions. Clinical predictors of ABI were identified by multivariate logistic regression analysis.ResultsOf 180 patients, 67 (37.2%) had ABI as revealed by DW-MRI. Multivariate analysis showed that CO exposure duration > 5 hours (adjusted odds ratio [AOR] = 7.082; 95% confidence interval [CI] = 3.463-15.014; p < 0.001) defined as the time between CO exposure and rescue, abnormal white blood cell count (AOR = 2.568, 95% CI = 1.188-5.700, p = 0.02), and abnormal creatinine concentration (AOR = 2.667, 95% CI = 1.110-6.605, p = 0.03) were predictors of ABI. CO exposure duration had the highest predictive value (area under the curve, 0.815), and the optimal cutoff value was 5 hours. Moreover, increasing exposure durations (quartile) indicated a stepwise increase in the risk of ABI.ConclusionsIn CO poisoning patients with an altered mental status, CO exposure duration was useful for predicting ABI, which may help clinicians or paramedics identify high-risk patients and provide treatment on priority.© 2018 by the Society for Academic Emergency Medicine.

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