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Figure 2 Arrhythmic event-free survival (absence of sudden arrhythmic death, symptomatic ventricular tachycardia, or cardiac arrest) according to the stepwise risk stratification protocol using noninvasive methods (upper panel) and programmed ventricular stimulation (lower panel). PVS was only performed in patients with abnormal HM or EF. HM = Holter ECG monitoring; PVS = programmed ventricular stimulation; EF = left ventricular ejection fraction. p Values derived from Cox regression analysis.