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A case of sport-induced long-QT syndrome. Male, 15-year-old, plays water polo at a competitive level (training >10 h/week). Negative medical and family history. ECG at pre-participation screening: QTc 597 ms, HR 79 bpm (A), with notched morphology of T waves. Detraining was recommended. Genetic testing of the genes associated with LQTS resulted negative. ECG after 3 months of detraining: QTC 394 ms, HR 58 bpm (B).
