RESUMEN
INTRODUCTION: Acute appendicitis (AA) is the most common surgical condition of the abdomen in children. The aim of this study was to analyse the possible use of the neutrophil-to-lymphocyte ratio (NLR) in the diagnosis and prediction of AA complications in children. MATERIAL AND METHODS: We included 170 AA patients under 15 years of age, who were divided into the following groups: Group 1 - non-operated patients with AA, and Group 2 - patients who underwent appendectomy. Based on pathologic grades of AA, Group 2 was subdivided into: Group A - phlegmonous, Group B - gangrenous, and Group C - perforated AA. NLR was calculated as the absolute neutrophil count divided by the absolute lymphocyte count. RESULTS: In Group 2 NLR was significantly higher than in Group 1 (5.5 (1.9-9.9) vs. 2.3 (1.2-3.7); p < 0.001). A significant difference in NLR was found between Group C and Group A (p < 0.001), and as well as between Group B and Group A (p = 0.001). The determined optimal cut-off value of NLR in differentiating Group 1 vs. Group 2 was ≥ 3.48 (p < 0.001). In differentiating Group A from Group C the optimal cut-off value of NLR was ≥ 5.61 (p < 0.001). Furthermore, optimal cut-off value of NLR in differentiating Group A from Group B was ≥ 5.45 (p = 0.001). CONCLUSIONS: The obtained results suggest that NLR could be used as a simple and reliable test in the diagnosis and prediction of AA complications in children. However, to draw definite conclusions on the predictive power of NLR as a marker of AA large multicentric studies are required.