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A, Receiver operating characteristic curve for PR interval, QRS duration, and QTc interval for the identification of SCN5A‐E1784K carriers vs noncarriers. The best correlation was found for QTc interval (area under the curve 0.993). B, Kaplan–Meier event‐free survival curves for SCN5A‐E1784K mutation carrier vs noncarriers are displayed. Noncarriers had no cardiac events. Four mutation carriers developed sudden cardiac arrest and ventricular fibrillation beyond the age of 40 years.
