PURPOSE: This study was performed for investigation of epidemiology, clinical characteristics, and serial value of cardiac troponin level of patients who had myocardial injury due to Carbon monoxide poisoning. METHODS: This study reviewed 98 cases of Carbon monoxide poisoning patients who visited Emergency Department from January 1, 2008 to October 31, 2013. We categorized them by two groups, one with elevation of cardiac troponin level and the other with normal level. We had comparison between two groups data using statistical analysis. RESULTS: Among 98 patients of Carbon monoxide poisoning who were admitted to hospital, 10 patients were excluded. 88 patients who were included to our study, 70 patients with normal value of Troponin, and 18 patients with elevated troponin level. Of all patients, Carbon monoxide inhalation due to suicided trial patients has more higher proportion in elevated troponin level group compared with normal group (40 (57.1%) vs 15 (83.3%), P=0.041). Furthermore, corrected QT interval, length of hospital stay, number of ICU admission, also were showed higher value in elevated troponin level group. CONCLUSION: Carbon monoxide induced myocardial injury is associated with subside trial, prolongation of correted QT interval, length of hospital stay, and number of ICU admission.