Hemogram Rates as Prognostic Markers of ICU Admission in COVID-19
Abstract BackgroundSince first cases of SARS COV-2 were identified, the number of affected and dead people make necessary to identify factors related to worse evolution. Endothelial injury has been proposed as the main pathophysiological mechanism in the illness development, which provokes a hyper inflammation and prothrombotic state. Leukocytes and platelets play a role in inflammation and thrombogenesis so we propose to study if neutrophil-to-lymphocyte ratio (NLR), platelets-to-lymphocyte ratio (PLR), the novel neutrophil-to-platelet ratio (NPR), and the systemic immune-inflammation index (SII), could be useful to identify patients who will need admission at Intensive Care Units.MethodsA retrospective observational study was performed at HM Hospitales including 2245 patients with COVID-19 from March 1 to June 10, 2020. Patients were divided into two groups, admitted, and not admitted to ICU. ResultsPatients requiring ICU admission had significantly higher rates at the moment of hospital admission in NLR (6.9 [4–11.7] vs 4.1 [2.6–7.6], p<0.0001), PLR (2 [1.4–3.3] vs 1.9 [1.3–2.9], p=0.023), NPR (3 [2.1–4.2] vs 2.3 [1.6–3.2], p<0.0001) and SII (13 [6.5–25.7] vs 9 [4.9–17.5], p<0.0001) than those who did not enter ICU. After multivariable logistic regression models, the hemogram rate that better remains as a predictor of ICU admission, when adjusted for the more complex model, was NPR, OR 1.11 (95% CI: 0.98-1.22, p=0.055).ConclusionsThe four rates obtained from hemogram at hospital admission, especially the novelty NPR, have shown to be useful as predictors of unfavorable clinical evolution.