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Figure 1: 12-lead electrocardiograms: (a) Day of life 1: Sinus rhythm at 108 bpm with no evidence of preexcitation, abnormal repolarization pattern suggestive of myocardial strain. (b) Day of life 7: Sinus rhythm at a rate of 124 bpm with preexcitation pattern suggestive of a left-sided accessory pathway. (c) Day of life 10: Wide-complex tachycardia at a rate of 227 bpm, likely AVT with aberrant interventricular conduction

Figure 1:  12-lead electrocardiograms: (a) Day of life 1: Sinus rhythm at 108 bpm with no evidence of preexcitation, abnormal repolarization pattern suggestive of myocardial strain. (b) Day of life 7: Sinus rhythm at a rate of 124 bpm with preexcitation pattern suggestive of a left-sided accessory pathway. (c) Day of life 10: Wide-complex tachycardia at a rate of 227 bpm, likely AVT with aberrant interventricular conduction