Affiliation:
1. The University Department of Medicine, Royal Infirmary, Glasgow, UK and the Maryland Medical Research Institute, Baltimore, USA
Abstract
SummaryBaseline white blood cell count (WCC) and haematocrit were examined in relation to recurrent coronary events and to all-cause mortality in 2026 persons enrolled in the first Persantin-Aspirin Reinfarction Study (PARIS-1) 2-60 months after myocardial infarction. WCC was strongly related to coronary recurrence (relative risk 3.5 for men with WCC ≥ 9 × 109/1 vs men with WCC < 5 × 109/1) and total mortality (relative risk 2.6). No such relationships were found for haematocrit. WCC correlated also with cigarette-smoking, diuretic use, serum cholesterol and uric acid; however, the associations with coronary recurrence and total mortality persisted on multiple linear and logistic regression analysis including these variables and treatment group (p <0.001). WCC is therefore an easily-measured prognostic variable in survivors of myocardial infarction. Furthermore, we suggest that white blood cells may promote myocardial ischaemia by capillary plugging and/or release of toxic oxygen metabolites.
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