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Figure 2 Plots of data of cardiac metaiodobenzylguanidine (MIBG) imaging in patients with chronic heart failure with and without cardiac events. H/M(e) and H/M(d) denote the cardiac MIBG heart to mediastinum ratio (H/M) on the early and delayed images, respectively. Patients with cardiac events had a significantly lower H/M(d) and higher washout rate (WR) than did those without cardiac events, although there was no significant difference in H/M(e) between the two groups.