ECG with no association between the QRS complex and the P wave. The child is often symptomatic, presenting with acute collapse. Ventricular tachyarrhythmias are often associated with underlying heart disease such as cardiomyopathy. Torsades de Pointes is a particular form of sinusoidal ventricular arrhythmia that occurs in the rare congenital long QT syndrome. If a child with ventricular tachycardia is acutely symptomatic they will require electrical cardioversion; if not, then treatment with an antiarrhythmic drug such as flecainide or amiodarone, or in the case of Torsades de Pointe, intravenous magnesium. Bradycardia. Heart rate less than 90/minute. May.
