Diagnostic and prognostic values of immunocyte ratios in patients with sepsis in the intensive care unit

The aim of this study was to evaluate the diagnostic and prognostic values of neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), platelet-to-neutrophil ratio (PNR), monocyte-to-lymphocyte ratio (MLR), neutrophils-to-lymphocytes and platelets ratio (N/LPR), mean platelet volume-to-platelet count ratio (MPV/PC), red blood cell distribution width-to-platelet count ratio (RDW/PC), and platelet volume distribution width-to-platelet count ratio (PDW/PC) in patients with sepsis.A total of 203 patients with sepsis admitted to an emergent intensive care unit (EICU) were enrolled in this retrospective study. Basic data, inflammatory factors, NLR, PLR, PNR, MLR, N/LPR, MPV/PC, RDW/PC, PDW/PC were compared between survival and non-survival groups. Receiver operating characteristic (ROC) curve was used to assess the diagnostic values. The univariate and multivariate regression analyses were used for constructing a prognostic model for sepsis.There were significant differences in acute physiology and chronic health evaluation (APACHEII) score, mechanical ventilation, use of vasopressors, acute kidney injury (AKI), continuous renal replacement therapy (CRRT), long-term antiplatelet drug use, lymphocyte, monocyte, hemoglobin, procalcitonin (PCT), interleukin-6 (IL-6), C-reactive protein (CRP)*PCT, and N/LPR. APACHE II had the highest diagnostic value [Area Under Curve (AUC) = 0.999], followed by CRP*PCT (AUC = 0.718). The prognoses were different between patients stratified according to CRP, IL-6, lactic acid (Lac), PNR, PLR, PDW/PC, and APACHEII. Lac, CRP*PCT, PDW/PC, MPV/PC and APACHE II were independent prognostic factors of sepsis.Both N/LPR and CRP*PCT had high values to predict mortality in sepsis patients. CRP*PCT, PDW/PC and MPV/PC were independent factors to predict the prognosis of sepsis.