Postoperative arrhythmias are a recognized complication of cardiac operations as it affects the hemodynamic stability. As Junctional Ectopic Tachycardia is the most common tachyarrhythmia in the postoperative course, we studied the incidence of JET, risk factors, inotrope usage, efficacy of treatment and outcome in 63 patients undergoing cardiac surgery on cardiopulmonary bypass during 6 months period. Twenty six patients (41.2%) developed JET. Ten patients had done fallot repair, four VSD closure, three CAVC repair & three senning operation. Correction of risk factors, hypothermia and sedation were effective in treatment of JET. Amiodarone was a safe effective antiarrhythmic drug.