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Wolff-Parkinson-White (WPW) syndrome causes paroxysmal supraventricular tachycardia in which short PR intervals and delta waves are seen in electrocardiography, which may cause sudden cardiac death. A 19-year female presented with increasing episodes of wide and narrow QRS complex tachycardia for the past 5 years. She had tricuspid atresia and Fontan Bjork operation in her past history. She was then diagnosed with narrow QRS complex tachycardia; and WPW syndrome was discovered when she returned to sinus rhythm. Ablation was performed from the coronary sinus ostium region via the left subclavian vein. Fontan Bjork procedure leading to accessory connections stemming from the surgery in the atrio-infundibular anastomosis may be one reason for WPW syndrome. In this case, since the ablation area was close to the Fontan anastomotic line, it could not be determined clearly whether WPW syndrome was secondary to Fontan anastomosis or it was congenital occult WPW syndrome, which became overt following Fontan surgery.

Wolff-Parkinson-White Syndrome after Fontan-Bjork operation and its Successful Ablation from Coronary Sinus