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Figure 4 Myocardial perfusion/contrast arrival was assessed using MR imaging after bolus administration of gadodiamide, an MR contrast agent. Time sequence display of selected short axis diastolic images (top) shows contrast arrival to the right ventricle (closed arrow), then to the left ventricle (open arrow), followed by the left ventricular myocardium. The mean size of the delayed contrast arrival zone (underperfused area of the myocardium) was 14.5 ± 5.4% of the left ventricle at baseline. The size of the myocardial area demonstrating delayed contrast arrival was reduced significantly at one and six months, as compared to baseline. *Statistical significance with a p < 0.05 by paired t test. ANOVA = analysis of variance.