Fig. 1

Flow diagram. *According to the 4 high-risk clinical items combined (previous known heart disease, exposure to a high voltage of ≥ 1000 V, initial loss of consciousness, abnormal initial ECG); if ≥ 1 items = high risk patients. Missing data, n = 31. **Initial elevated troponin and/or significant rise on the 2nd essay. MACE Major Adverse Cardiac Even