1. Date of download: 9/17/2016 Copyright © The American College of Cardiology. All rights reserved. From: Prevalence and Characteristics of Early Repolarization in the CASPER Registry: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry J Am Coll Cardiol. 2011;58(7):722-728. doi:10.1016/j.jacc.2011.04.022 Figure Legend: Type I Early Repolarization Pattern in an IVF Patient (A) A 12-lead electrocardiogram (ECG) Type I inferolateral early repolarization pattern (ERP) (arrows indicate J-wave elevation). (B) Rhythm strip with beat-to-beat fluctuation of the J-wave. Note the post-extrasystolic pause increase of the J-wave (*). IVF = idiopathic ventricular fibrillation.

2. Date of download: 9/17/2016 Copyright © The American College of Cardiology. All rights reserved. From: Prevalence and Characteristics of Early Repolarization in the CASPER Registry: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry J Am Coll Cardiol. 2011;58(7):722-728. doi:10.1016/j.jacc.2011.04.022 Figure Legend: Type II Early Repolarization Pattern in an IVF Patient A 12-lead ECG of a patient with Type II ERP in the inferolateral leads. (Right) Discrete J-wave elevation in leads III and V 6 (*). Abbreviations as in Figure 1.

3. Date of download: 9/17/2016 Copyright © The American College of Cardiology. All rights reserved. From: Prevalence and Characteristics of Early Repolarization in the CASPER Registry: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry J Am Coll Cardiol. 2011;58(7):722-728. doi:10.1016/j.jacc.2011.04.022 Figure Legend: Distribution of Diagnoses and Early Repolarization in the Patient Cohort (A) Diagnostic yield in 100 patients with unexplained cardiac arrest. The proportion of subclinical primary electrical disease is depicted in the pie chart to the right. (B) Distribution of ERP in IVF patients (n = 56) and in diagnosed VF patients (n = 44). ARVC = arrhythmogenic right ventricular cardiomyopathy; CPVT = catecholaminergic polymorphic ventricular tachycardia; LQTS = long QT syndrome; Spasm = coronary spasm; VF = ventricular tachycardia; other abbreviations as in Figure 1.

4. Date of download: 9/17/2016 Copyright © The American College of Cardiology. All rights reserved. From: Prevalence and Characteristics of Early Repolarization in the CASPER Registry: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry J Am Coll Cardiol. 2011;58(7):722-728. doi:10.1016/j.jacc.2011.04.022 Figure Legend: Day-to-Day Fluctuation of ERP in an IVF Patient The ECG recorded at different times after cardiac arrest demonstrates fluctuation of J-wave amplitude with typical Type I ERP (day 2); Type II ERP (day 1), and no evidence of ERP day 4 after the cardiac arrest. The asterisks indicates typical infero-lateral type 1 ERP. Abbreviations as in Figure 1.

5. Date of download: 9/17/2016 Copyright © The American College of Cardiology. All rights reserved. From: Prevalence and Characteristics of Early Repolarization in the CASPER Registry: Cardiac Arrest Survivors With Preserved Ejection Fraction Registry J Am Coll Cardiol. 2011;58(7):722-728. doi:10.1016/j.jacc.2011.04.022 Figure Legend: Lead V 5 ECG Series in a 29-Year-Old Male With Cardiac Arrest Patient #5 (Table 2) has a family history of sudden death. He had experienced 2 syncopal episodes in conjunction with auditory stimuli, and collapsed shortly after an alarm clock sounded and was resuscitated from ventricular fibrillation. The resting QT is unremarkable, but prolonged by 60 ms with 0.10 μg/kg/min adrenaline, and failed to shorten with exercise. The ambulance 12-lead and day 1 post-arrest ECG show J-wave elevation that is initially slurred and subsequently notched. Genetic testing for LQTS genes was negative, and there were no family members with similar findings.