Abstract Background There was limited data about the association between the electrocardiographic characteristics and irreversible fulminant hepatitis (IFH) in patients with acute hepatic failure (AHF) in the long-term follow up. Purpose The aim of this study was to analysis the electrocardiographic characteristics for prediction of IFH in patients with AHF. Methods Our University echocardiography, electrocardiogram (ECG) and viral hepatitis database were reviewed from 2008 to 2017 to identify patients with AHF. Patients were followed for a mean 32.0±0.8 months and were analyzed to find out the predictors for IFH. Results Among 202 patients with AHF, 23 (11.4%) patients had IFH. In our study, there are 118 (58.7%) viral hepatitis patients (hepatitis A, 83 patients, 41.3%; hepatitis B, 19 patients, 9.5%; hepatitis C, 15 patients, 7.5%) and alcoholic hepatitis patients (83 patients, 41.3%). Based on the ROC curve, we set the corrected QT interval (QTc) cutoff value of 425 msec for prediction of IFH, which gave a sensitivity of 66.7% and a specificity of 66.0% (P=0.002). In univariate analysis, age, QTc, diabetes mellitus (DM), heavy alcoholics, labile INR, hemoglobin, albumin, total bilirubin, sodium, and c-reactive protein were significantly associated with IFH. In multivariate analysis, age, QTc, DM, heavy alcoholics, and total bilirubin were independent risk factors for IFH at the long-term follow-up. Conclusion Longer QTc (>425msec) in patients with AHF was associated with higher IFH, suggesting close clinical and electrocardiographic follow-up will be required. Acknowledgement/Funding None