Podolecki TS, et al. - In a total of 4,363 consecutive patients with ST-segment elevation myocardial infarction (STEMI) treated invasively, researchers assessed risk factors for ventricular fibrillation/sustained ventricular tachycardia (VF/VT) to develop the risk score for prediction of VF/VT in these subjects, as well as evaluated the influence of VF/VT on mortality depending on timing of arrhythmia. Of the overall selected patients, 163 patients with pre-reperfusion arrhythmia were excluded. The identified independent predictors of VF/VT occurrence included cardiogenic shock on admission, new-onset atrial fibrillation, incomplete revascularization, prior myocardial infarction and symptom-to-balloon time more than 3 h. As per observations, for risk stratification for VF/VT in patients with STEMI, the possible utility of the risk score based on simple clinical parameters was suggested. Timing of arrhythmia was identified as the factor on which predictive value of VF/VT strongly depended.