Fig. 1.

Kaplan-Meier analysis of cardiac event-free survival, based on initial clinical presentation. (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 a history of syncope to asymptomatic patients. ^†p was obtained by the log-rank test comparing patients with an episode of aborted cardiac arrest to asymptomatic patients.