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Arrhythmias in Ebstein’s anomaly

Cardiac arrhythmias are common in Ebstein’s anomaly of tricuspid valve. Accessory pathways located along the abnormal tricuspid valve is the most important cause of arrhythmias associated with Ebstein’s anomaly. Accessory pathways are muscle bundles extending from the atrial myocardium to the ventricular myocardium across the annulus fibrosus. Accessory pathways may be seen in about one third of patients with Ebstein’s anomaly. Other types of arrhythmia seen in Ebstein’s anomaly are ectopic atrial tachycardia, atrial flutter, intra atrial re-entrant tachycardia, atrial fibrillation, and ventricular tachyarrhythmia.