Prognostic role of Neutrophil-Lymphocyte Ratio and Platelet-Lymphocyte Ratio in critically ill COVID-19 patients: A retrospective study.

Introduction: Critical coronavirus disease (COVID-19) patients have a high mortality rate. To identify high-risk patients, first-level healthcare facilities can use the neutrophil-lymphocyte ratio (NLR) and the plateletlymphocyte ratio (PLR) as prognostic markers. We aimed to assess the NLR and the PLR profile in critically ill COVID-19 patients to predict disease severity.

Materials and methods: This descriptive retrospective study featured 221 patients diagnosed with clinically critical COVID-19 from August 2021 to March 2022 in the Intensive Care Unit (ICU) of RSUP Dr. M. Djamil, Padang, Indonesia. The study employed a total sampling technique to collect data from medical records in the hospital. Patients aged 18 years or older who underwent testing for leukocytes, platelets, neutrophils, and lymphocytes were included in the study. We analysed the data using descriptive univariate analysis. Then, the NLR and PLR of the patients were statistically compared based on comorbidities and coincidence.

Results: According to the study, most patients with critically ill COVID-19 exhibited high levels of NLR (88.2%) and PLR (71.1%). The severe COVID-19 patients with comorbidity of kidney disease had the highest NLR (Mean ± SD) of 31.74 ± 27.95 (p-value <0.001) and the highest mean PLR (Mean ± SD) of 469.33 ± 362.95 (p-value 0.001).

Conclusion: Our findings showed a significantly higher NLR and PLR in patients with critically ill COVID-19, particularly in patients with comorbidity of kidney disease. Thus, elevated levels of NLR and PLR were identified as potential prognostic markers for predicting disease severity in COVID-19 patients, especially those with kidney comorbidity.