Table 1.

Summary of patient characteristics

	Patient
	1	2	3	4
Age (years)	38	74	89	42
Gender	M	F	F	F
QT-prolonging medications	Sotalol	Ondansetron Citalopram	Quinidine	Amitriptyline Haloperidol
Bradycardia	+	+	0	0
Hypokalemia	0	+	+	+
Hypomagnesemia	0	+	0	+
QTc interval (msec)	559	610	550	610
Suspected latent congenital long QT syndrome	0	+	0	0
Torsade de pointes	+	+	+	+
Ventricular fibrillation	+	0	0	0
Treatment
Magnesium	+	+	0	+
Potassium	0	+	+	+
Pacing	+	+	0	0