185-189 Effect of High

The aim of this study was to determine the effect of high-dose methylprednisolone (HDMP) on lymphocyte subtypes, CD4/CD8 ratio and clinical efficacy of the treatment in children with acute immune thrombocytopenic purpura (ITP). The study consisted of 21 children (aged between 1.5-14 years) with ITP treated with HDMP for 7 days. Absolute lymphocyte count, CD4+ and CD8+ T lymphocyte levels were examined on peripheral blood and CD4/CD8 ratio was calculated before and after HMTP treatment (on 0 and 8th days) in all subjects. There was no statistically significant difference for age and sex between the study and the control group. A significant reduction was observed in the percentage of CD4+ lymphocyte (39.0 ± 7.5% vs 29.3 ± 8.1%, p= 0.001), CD8+ lymphocyte (27.1 ± 7.2% vs 23.7 ± 8.3%, p= 0.03), CD4+/CD8+ (1.5 ± 0.5 vs 1.3 ± 0.4, p= 0.02) and the absolute number of CD4+ lymphocyte count (1694.99 ± 1019 vs 1199.12 ± 612, p= 0.038). These findings indicated that HDMP treatment may cause a decrease in the percentage of CD4+ and CD8+ T-lymphocyte and ratio of CD4+/CD8+ lymphocyte in patients with acute ITP. We suggest that the effectiveness of steroids may depended upon the suppression of CD4 T-lymphocyte and sequential monitoring of circulating lymphocyte subtypes may be used to predict the clinical effects of steroid treatment.