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. Author manuscript; available in PMC: 2016 Jun 14.
Published in final edited form as: Heart Rhythm. 2014 Oct 31;12(2):419–422. doi: 10.1016/j.hrthm.2014.10.035

Figure 1. Electrocardiograms of the Proband.

Figure 1

(A) ECG taken at 1 day of age showing extreme QT prolongation (QTc = 690 ms), 2:1 atrioventricular block, bradycardia (59 bpm), and T wave alternans. (B) ECG at 5 weeks of age showing QT prolongation (QTc = 586 ms) at a normal heart rate (111 bpm) and resolution of the 2:1 AV block. (C) ECG at 6 months of age showing marked QT prolongation (QTc = 556 ms).