It is relevant in this regard that there have been no reports of sinus bradycardia associated with the V307L mutation in KCNQ1, with physical examination of the first proband identified revealing no electrophysiological anomalies other than a shortened QT interval, as well as the episode of ventricular fibrillation for which he was admitted to hospital (Bellocq et al., 2004). This evidence concerns the gene KCNQ1 and ventricular fibrillation.