Table 1.

Clinical features of the family studied

	Age (years)	Sex	Mutations	Heart rate (bpm)	QT (seconds)	QTc (seconds)
Proband	15	M	SCN5A-F1596I	93	0.38	0.47
			hERG-S654G
			hERG-A913V
Mother	39	F	SCN5A-F1596I	71	0.39	0.43
			hERG-S654G
Father	40	M	hERG-A913V	61	0.29	0.39
Sister 1	13	F	SCN5A-F1596I	83	0.35	0.41
Sister 2	7	F	hERG-A913V	83	0.36	0.42