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Figure 2 Kaplan-Meier event-free survival curves for spontaneous events in patients with myocardial viability and ischemia (group 1), myocardial viability without ischemia (group 2) and no myocardial viability (group 3) during dobutamine stress echocardiography. Cumulative survival free of spontaneous events was significantly lower in group 1 patients compared to group 2 (p < 0.002) and group 3 patients (p < 0.005), whereas no difference was present between group 2 and 3.