Young healthy 17-year-old competitive soccer player, daily workouts. Never presented any symptoms, until in a moment of heated discussion with a brother collapses, being resuscitated successfully. Ventricular fibrillation was documented. Days later he was done: = normal echocardiogram, normal exercise stress testing = no arrhythmia any, normal coronary angiography. no coronary anomalies. Deputy baseline ECG and strain-relaxation phase of Valsalva performed 3 weeks after the event.