Relation Between White Blood Cell Count and Final Infarct Size in Patients With ST-Segment Elevation Acute Myocardial Infarction Undergoing Primary Percutaneous Coronary Intervention (from the INFUSE AMI Trial)

Published:September 23, 2013DOI:
      Although it has been shown that elevated white blood cell count (WBCc) on presentation is associated with an increased risk of cardiac mortality in patients with ST-segment elevation myocardial infarction (STEMI), the responsible mechanisms are unknown. We therefore sought to investigate whether elevated WBCc is associated with increased infarct size measured with cardiac magnetic resonance imaging 30 days after primary percutaneous coronary intervention in the Intracoronary Abciximab and Aspiration Thrombectomy in Patients With Large Anterior Myocardial Infarction trial. INFUSE AMI randomized patients with STEMI and proximal or mid–left anterior descending coronary artery occlusion to bolus intracoronary abciximab versus no abciximab and to manual aspiration versus no aspiration. WBCc at hospital admission was available in 407 of 452 randomized patients. Patients were stratified according to tertiles of WBCc. At 30 days, a significant stepwise increase in infarct size (percentage of total left ventricular mass) was apparent across tertiles of increasing WBCc (median [interquartile range] for tertiles I vs II vs III = 11.2% [3.8% to 19.6%] vs 17.5% [0.5% to 22.9%] vs 19.1% [13.7 to 26.0], respectively, p <0.0001). Absolute infarct mass in grams and abnormal wall motion score were also significantly increased across tertiles of WBC. By multivariate linear regression analysis, WBCc was an independent predictor of infarct size along with intracoronary abciximab randomization, age, time from symptom onset to first device, proximal left anterior descending location, and baseline TIMI flow of 0/1. In conclusion, in patients with anterior wall STEMI, an elevated admission WBCc is a powerful independent predictor of infarct size measured with cardiac magnetic resonance imaging 30 days after primary percutaneous coronary intervention.
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      • Relation Between White Blood Cell Count and Infarct Size: What About Differential?
        American Journal of CardiologyVol. 113Issue 2
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          In the very interesting report published in the Am J Cardiol 2013,1 it was found that in patients with anterior wall acute myocardial infarction, elevated white blood count on admission is a powerful independent predictor of infarct size measured with cardiac magnetic resonance imaging 30 days after primary percutaneous coronary intervention. A previous study has also shown2 that in patients with ST-segment elevation acute myocardial infarction undergoing percutaneous coronary intervention, elevated baseline white blood count is an independent predictor of infarct size, as assessed by peak creatinine phosphokinase level, and of 1-year cardiac mortality, noncardiac mortality, and major bleeding.
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