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Figure 3 Event-free survival according to the electrocardiogram (ECG) response and the single-photon emission computed tomography (SPECT) results. The event-free survival was significantly and independently associated with both ECG (p = 0.035) and SPECT (p = 0.012) results. Patients with normal ECG responses and normal SPECT results had a very favorable event-free survival (p = 0.0062 vs. other groups). Patients with abnormal ECG responses and abnormal SPECT results had a very high event rate.