[Extraordinary findings after radiofrequency ablation]

We report the successful treatment with Heparin and Phenprocoumon of a large, free-floating, right atrial thrombus that developed after radiofrequency ablation (RFA) of an accessory pathway in a 24 year old patient with Wolff-Parkinson-White (WPW) Syndrome. In addition, "T-wave memory", a relatively common phenomenon after RFA in WPW-Syndrome, is demonstrated.