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Background  Large myocardial infarction (MI) is associated with adverse left ventricular (LV) remodeling (LVR). We studied the nature of LVR, with specific attention to non-transmural MIs, and the association of peak CK-MB with recovery and chronic phase scar size and LVR.    Methods  Altogether 41 patients underwent prospectively repeated cardiovascular magnetic resonance at a median of 22 (interquartile range 9–29) days and 10 (8–16) months after the first revascularized MI. Transmural MI was defined as ≥75% enhancement in at least one myocardial segment.    Results  Peak CK-MB was 86 (40–216) μg/L in median, while recovery and chronic phase scar size were 13 (3–23) % and 8 (2–19) %. Altogether 33 patients (81%) had a non-transmural MI. Peak CK-MB had a strong correlation with recovery and chronic scar size ( r  ≥ 0.80 for all,  r  ≥ 0.74 for non-transmural MIs;  p  < 0.001). Peak CK-MB, recovery scar size, and chronic scar size, were all strongly correlated with chronic wall motion abnormality index (WMAi) ( r  ≥ 0.75 for all,  r  ≥ 0.73 for non-transmural MIs;  p  < 0.001). There was proportional scar size and LV mass resorption of 26% (0–50%) and 6% (− 2–14%) in median. Young age (< 60 years, median) was associated with greater LV mass resorption (median 9%vs.1%,  p  = 0.007).    Conclusions  Peak CK-MB has a strong association with chronic scar size and wall motion abnormalities after revascularized non-transmural MI. Considerable infarct resorption happens after the first-month recovery phase. LV mass resorption is related to age, being more common in younger patients.

bmc cardiovascular disorders

Peak CK-MB has a strong association with chronic scar size and wall motion abnormalities after revascularized non-transmural myocardial infarction – a prospective CMR study