Abstract
ObjectivesThis study investigated the safety profile and potential “therapeutic” effect of intravenous ultrasmall superparamagnetic iron-oxide (USPIO)-based iron administration regarding infarct healing in patients with ST-elevation myocardial infarction (STEMI). USPIO-administration was recently shown to enable an improved characterization of myocardial infarct pathology in acute STEMI patients. Materials and MethodsSeventeen study patients (IRON, 54±9yrs, 88% male) and 22 matched controls (CONTROL, 57±9yrs, 77% male) both with primary reperfused STEMI underwent multi-parametric CMR studies in the first week and three months after acute MI. Only IRON patients received a single intravenous bolus of 510mg elemental iron as ferumoxytol (FerahemeTM) within four days following acute MI. ResultsThree months later, all patients were alive and there were no adverse cardiac events. Significant improvement in left ventricular (LV) ejection fraction (IRON: 53±10% to 59±9%, p=0.002; CONTROL: 54±6% to 57±10%, p=0.005) as well as shrinkage of infarct size were seen in both groups at follow-up. There was a more pronounced decrease in infarct size in the IRON group (IRON: −10.3±5.4% vs. CONTROL: −7.0±8.4%, p=0.050) in addition to a significant decrease in both endocardial extent and prevalence of transmural infarctions in IRON but not in CONTROL patients. A significant decrease in LV end systolic volume was only seen in the IRON group (71±25mL to 59±25mL, p=0.002). ConclusionsIntravenous iron administration in acute STEMI patients seems to be associated with an improved infarct healing and a beneficial global left ventricular remodelling. These findings together with the good safety profile make USPIO-based iron administration a promising future candidate as a “diagnostic” and “therapeutic” adjunctive solution in acute MI management.
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