Arrhythmias and Congenital Heart Disease
Atrial and ventricular arrhythmias are common in congenital heart diseases due to chamber enlargement (stretching) and/or scarring in the atria or ventricles. Conditions such as atrial septal defects after surgical repair, Tetralogy of Fallot, classic and lateral tunnel Fontan circuits, and transposition of the great arteries after Senning/Mustard repair can be at higher risk for heart arrhythmias. Leaking of the valves that separate the atria from the ventricles can cause the atria to become large over time and long term scar formation can damage the cardiac electrical system. This injury to the heart muscle can create abnormal circuits that can trigger abnormally fast or slow rhythms.
Diagnosis and treatment of atrial or ventricular arrhythmias in congenital heart disease are similar to these arrhythmias in patients with normal heart structure.