Background: QT interval is attracting the interest of many investigators. In the last two decades, lengthening in the QT interval has been felt to be associated with electrical instability and Sudden Cardiac Death (SCD). The QT interval is an indirect measure of the duration of action potential depolarization and repolarization of the ventricles. Aim of the study: The goal of the present study is to correlate between QTc dispersion obtained from standard surface 12 lead ECG and left ventricular systolic and diastolic function obtained from transthoracic echocardiography in the setting of acute STEMI promptly after presentation and prior to revascularization. We also aim to evaluate how accurate is the QTc dispersion as an ECG index in predicting LV function after acute STEMI. Results: There was a statistically significant difference between patients who developed ventricular arrhythmias-prior to reperfusion strategy-and those who did not suffer ventricular arrhythmias regarding QTcD (p<0.001). Mean QTcD in ventricular arrhythmia group was much higher than that in non-arrhythmia group (125.26 ± 28.73 msec. vs. 73.41 ± 23.9 msec.). Also, a strong negative correlation (r=˗0.772) be
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