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BACKGROUND: ECG abnormalities in COVID-19 have been widely reported, however data after discharge is limited. The aim was to describe ECG abnormalities on admission and following recovery of COVID-19, and their associated mortality. METHODS: All patients hospitalized in a tertiary care hospital between March 7th and July 1st 2020 with COVID-19 were included in a retrospective registry. The first ECG on admission was collected, together with an ECG after hospital discharge in the absence of acute pathology. Automated measures and clinical ECG interpretations were collected. Multivariate Cox regression analysis was performed to predict 1-year all-cause mortality. RESULTS: In total 420 patients were included, of which 83 patients (19.8%) died during the 1-year follow-up period. Repolarization abnormalities were present in 189 patients (45.0%). The extent of repolarization abnormalities was an independent predictor of 1-year all-cause mortality (HR per region 1.30, 95%CI 1.04-1.64) together with age (/year HR 1.06, 95%CI 1.04-1.08), heart rate (/bpm HR 1.02, 95%CI 1.01-1.03), neurological disorders (HR 2.41, 95%CI 1.47-3.93), active cancer (HR 2.75, 95%CI 1.57-4.82), CRP (per 10 mg/L HR 1.05, 95%CI 1.02-1.08) and eGFR (per 10 mg/L HR 0.90, 95%CI 0.83-0.98).In 245 patients (68.1%) an ECG post discharge was available. New repolarization abnormalities were more frequent in patients who died after discharge (4.7% versus 41.7%, p