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Relation of White Blood Cell Count to Bleeding and Ischemic Events in Patients With Acute Coronary Syndrome (from the ATLAS ACS 2-TIMI 51 Trial)
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Relation of White Blood Cell Count to Bleeding and Ischemic Events in Patients With Acute Coronary Syndrome (from the ATLAS ACS 2-TIMI 51 Trial)
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Journal Article
Relation of White Blood Cell Count to Bleeding and Ischemic Events in Patients With Acute Coronary Syndrome (from the ATLAS ACS 2-TIMI 51 Trial)
2020
Overview
An elevated white blood cell (WBC) count is associated with an increased risk of ischemic events among acute coronary syndrome (ACS) patients, but the association between WBC count and bleeding in ACS patients is not well established. The aim of this analysis was to assess and compare the association between WBC count and the occurrence of short- and long-term bleeding and ischemic events. This was a post hoc analysis of the ATLAS ACS2-TIMI 51 trial. A subset of patients had a WBC count measurement at baseline (n = 14,231, 91.6%). Univariate and multivariable Cox proportional hazard models were constructed to determine if there is an association between WBC count at baseline and a composite outcome of Thrombolysis in Myocardial Infarction (TIMI) major and minor bleeds at 30 days and 1 year. Variables with a p <0.2 in the univariate analysis were included as potential parameters in the backward selection process A similar multivariable model was constructed to assess the association between WBC count and a composite ischemic endpoint of cardiovascular death, myocardial infarction and stroke. An increased risk of bleeding per a 1 × 109/L increase in WBC at baseline was observed at 30 days (Adjusted hazard ratio [HR] 1.08 95% confidence interval [CI] 1.01 to 1.17, p = 0.019) but not at 1 year (Adjusted HR 1.02 95% CI 0.97 to 1.08, p = 0.409). Additionally, an increased risk of ischemia per a 1 × 109/L increase in WBC at baseline was observed at 30 days (Adjusted HR 1.07, 95% CI: 1.03 to 1.12, p = 0.002) and at 1 year (Adjusted HR 1.05 95% CI 1.02 to 1.08, p = 0.001 at 1 year). In conclusion, a higher WBC count at baseline was associated with an increased risk of the composite bleeding endpoint by 30 days but not at 1 year. The association between WBC count and the risk of the composite ischemic endpoint was significant at 30 days and 1 year.
Publisher
Elsevier Inc,Elsevier Limited
Subject
