Background: Inflammation has an important role in the pathogenesis of atherosclerosis. The aim of this study was to evaluate the role of WBC (White Blood Cell) count and incidence of morbidity and mortality in patients with ACS.

Materials and Methods: This prospective study was carried out on 101 patients with ACS who admitted in Bu-ali Sina hospital. All patients were stratified according to WBC categories in to 3 groups, (WBC 1 :<7000 mm3, WBC 2:7000 -10000 mm3, WBC 3:> 10000 mm3). Demographic and laboratory data such as acute reactive protein, cardiac biomarker and etc. were recorded. Adverse cardiac events and mortality were recorded to a phone or in person for six months of follow up period. The collected data were analyzed using SPSS software (Statistical Package for Social Sciences, version 17.0). The Fisher´s exact chi-square test and the student t-test were applied. P-values less than 0.05 were considered significant.

Results: In our study, 5 patients (31.25%) in third group had recurrent non fatal cardiac event and the same percent (31.25%) were died after 6 months follow up. Multivariate analysis showed WBC count >10000 mm3 was strongest predictor of outcome in our patients.

Conclusion: WBC count can be considered one of the strong independent predictor of mortality and cardiac event in patients with ACS.