Abstract
BACKGROUND: Atopic dermatitis is a dermatological disease characterized by chronic inflammation. In recent years, systemic inflammation is also mentioned along with local inflammation for its pathogenesis. Neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), and mean platelet volume (MPV) are nonspecific indicators of systemic inflammation, and they were shown to be associated with the disease and its prognosis in allergic or nonallergic diseases. AIMS AND OBJECTIVES: The aim of this study was to evaluate the values of NLR, PLR, and MPV in atopic dermatitis patients and also to investigate the associations of them with the atopic dermatitis disease severity and duration. MATERIALS AND METHODS: Two hundred and fifty-two atopic dermatitis patients and 75 control group individuals were included in the study. Mean/median values of NLR, PLR, and MPV were compared among patients and controls, severity groups classified according to SCORing Atopic Dermatitis (SCORAD) and intrinsic and extrinsic groups. Correlation of disease duration and SCORAD with NLR, PLR, and MPV values were examined. Disease duration and its association with NLR were evaluated by correlation and linear regression analysis. RESULTS: Mean NLR and median PLR values of atopic dermatitis patients were higher than those of controls (0.97 ± 0.69 and 80.86 [59.86-108.23], respectively). NLR and PLR values were found to be positively correlated with disease duration and NLR was positively associated with disease duration after adjustment. NLR value was also higher in the extrinsic group than the intrinsic group. CONCLUSION: Presence of systemic inflammation in the pathogenesis of atopic dermatitis was considered to be associated with increased NLR and PLR values. These parameters were also associated with disease duration and might vary between subtypes of atopic dermatitis. NLR and PLR were cheaper and easily accessible alternatives to the systemic inflammation biomarkers that were expensive and not accessible for all laboratories, particularly in economically disadvantaged countries.