Contribution of Continuous Intravenous Lidocaine in Managing Congenital Long QT Syndrome with 2:1 Atrioventricular Block.

Congenital long QT syndrome (LQTS) is a rare hereditary cardiac disorder characterized by prolongation of the QT interval on electrocardiogram (ECG), predisposing affected individuals to life-threatening arrhythmias. We present a case of a newborn with congenital LQTS and 2:1 atrioventricular (AV) block who presented with bradycardia and QT prolongation. Continuous intravenous lidocaine infusion was initiated, because of hypoglycemia with beta-blockers, resulting in stabilization of AV conduction and prevention of malignant arrhythmias.