Left lateral accessory pathway successfully ablated from within the coronary sinus, a case report.

WPW (Wolff-Parkinson-White) syndrome is a congenital heart condition characterized by an abnormal accessory electrical pathway in the heart that can cause rapid heartbeat (supraventricular tachycardia). Radiofrequency ablation is considered the first-line treatment, it can be curative in almost 95% of patients. Sometimes ablation therapy can fail when the pathway is close to the epicardium. We hereby report a case of a patient with a left lateral accessory pathway. Several attempts of ablation from the endocardium targeting a clear pathway potential failed. Subsequently, the pathway was safely and successfully ablated from within the distal coronary sinus.