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Kaplan-Meier analysis of cardiac event-free survival, based on the presence of a spontaneous type 1 ECG pattern. (A) Appropriate shock-free survival. (B) Cardiac admission-free survival. (C) Inappropriate shock-free survival. (D) Composite of events (appropriate shock, cardiac admission, and inappropriate shock). *p was obtained by the log-rank test comparing patients with and without a spontaneous type 1 ECG pattern. ECG, electrocardiography.
