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Figure 6 Infarct expansion measured by delayed magnetic resonance imaging (MRI) in intra-aortic balloon counterpulsation (IABC) (n = 9) and control (n = 8) animals increased over 24 h of reperfusion in both groups (p < 0.03). Infarct expansion was decreased in IABC relative to controls (p < 0.04). p < 0.04 vs. control. LV = left ventricular.