Different Spectrum of Arrhythmia in Myocarditis: QT Interval Prolongation Followed to Supraventricular Tachycardia

Acute myocarditis is an infection in infants which may be complicated by cardiac dysfunction and arrhythmias. Sinus tachycardia with low-voltage QRS complexes, T waves and ST-segment changes, atrial or ventricular tachycardia, atrioventricular block, QT interval prolongation on electrocardiogram (ECG) may be seen in patients with acute myocarditis. Although atrial or ventricular arrhythmias have been reported in myocarditis, there are limited reports of arrhythmias complicating with each other. We describe the case on an infant presented with supraventricular tachycardia complicating to the QT interval prolongation and back to the sinus rhythm in viral myocarditis