The commonest arrhythmias encountered were:Ventricular premature beats followed by Sinus tachycardia, Sinus bradycardia, Bundle branch block, Ventricular tachycardia. The arrhythmias were seen in the first 48 hours. In addition to arrhythmias, LV dysfunction added to the mortality.17 out of 69 patients who had thrombolysis therapy developed reperfusion arrhythmias of which occasional ventricular premature beats being commonest.Most common arrhythmias on day 1 are:Ventricular tachycardia, Ventricular fibrillation,Atrial tachyarrhythmias like atrial fibrillation and atrial flutter .Sinus bradycardia and bundle branch blocks were more common in the inferior wall.Sinus tachycardia was more common in anterior wall MI.Severe ventricular dysfunction EF (20 – 30%) was single important factor for mortality in arrhythmias following acute myocardial infarction.