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Clinical characteristics of the family (Figure 1). (a, b, and d) 12‐lead ECG of the proband's father (Ⅱ‐2) (a), paternal aunt (Ⅱ‐4) (b), and daughter (Ⅳ‐3) (d). Arrows indicate prominent U‐waves. (c) V1 lead of the proband's father (Ⅱ‐2) during ventricular pacing due to atrial tachycardia with atrioventricular block. (e) Short‐axis view during systole of transthoracic echocardiogram of the proband's daughter (Ⅳ‐3)
