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Methods TIMI flow grade, MBG and ST-segment resolution were assessed in 60 patients with AMI, treated with primary stenting. CMR was performed within 9 days and at 4 months, to determine global and regional LV function, first pass perfusion defects, size and extent of late gadolinium-enhanced (LGE) infarct and MVO (Figure 1). Results First pass perfusion defects and LGE MVO were both related to incomplete ST resolution (p = 0.002 and p = 0.01 respectively), but not to TIMI flow and MBG. Of all angiographic, electrocardiographic, and CMR variables, LGE infarct size was the strongest predictor for baseline LV function and volumes. However, presence of LGE MVO was the strongest parameter to predict change at followup. Regional analysis showed that only 6% (23/372) of dysfunctional segments with MVO completely recovered during follow-up, compared to 35% (631/1.786) without MVO (odds ratio 0.18, p < 0.0001). MVO was associated with wall thinning and less improvement of wall thickening, independent of infarct transmurality.

journal of cardiovascular magnetic resonance

123 Functional recovery after acute myocardial infarction: a comparison between angiography, electrocardiography and cardiovascular magnetic resonance measures of microvascular injury