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We present a clinical case of a rare form of the WPW phenomenon due to anterograde conduction over fasciculoventricular accessory pathway in 20-year-old competitive athlete. The patient had no history of palpitations or syncope. ECG revealed shortening of PQ interval (112 ms) and wide QRS complex due to conduction via accessory pathway. To address the question of participation in competitive activity and the need for ablation the patient underwent endocardial electrophysiological study in the course of which we verified conduction via fasciculoventricular accessory pathway. The result of the study was used in determination of strategy of further management.