Neutrophil Count on Admission Predicts Major In‐hospital Events in Patients with a Non‐ST‐Segment Elevation Acute Coronary Syndrome

BACKGROUND: Inflammation plays a key role in the pathogenesis of acute coronary syndromes (ACS). In this context we assessed neutrophil count as a predictor of major in-hospital events in patients admitted for a non-ST-segment elevation (NSTE) ACS. METHODS: We measured neutrophils on admission in 160 patients with a NSTE ACS and we correlated their count with the incidence of a combined in-hospital end point including: cardiac death, acute heart failure, ST-segment elevation myocardial infarction, and recurrent myocardial ischemia. RESULTS: Patients who had a major in-hospital event also had a higher neutrophil count (P = 0.02) and higher serum levels of troponin I (P = 0.04). In the univariate logistic regression analysis, in-hospital major events could be predicted by troponin I > 0.07 ng/mL (odds ratio [OR]: 5.65, 95% confidence interval [CI]: 1.26-25.32, P = 0.02), white blood cell count > 8650 cells/microL (OR: 2.68, 95% CI: 1.03-6.95, P = 0.04), neutrophil count > 6700 cells/microL (OR: 7.74, 95% CI: 2.79-21.47, P < 0.001), and C-reactive protein > 0.97 mg/dL (OR: 3.56, 95% CI: 1.13-11.19, P = 0.02). However, in multivariate regression, neutrophil count > 6700 cells/microL (OR: 6.52, 95% CI: 1.56-27.22, P = 0.01) was the only independent in-hospital prognostic factor. CONCLUSIONS: In patients with a NSTE ACS of moderate or high risk, neutrophil count on admission may identify those who are at risk of having an adverse in-hospital outcome.