[Predictive value of C-reactive protein on hospital admission and mechanical ventilation requirement in adults hospitalized for COVID-19]

Introduction: During the COVID-19 pandemic, patients with worse evolution presented clinical deterioration 7-10 days after the onset of symptoms, which suggests that the inflammatory response could participate in the pathophysiology of the disease. The objective of this study was to evaluate the association between plasma C-reactive protein (PCr) on hospital admission and mechanical ventilation requirement during hospitalization in adults with COVID-19. Methods: Retrospective, observational cohort at a private center in the province of Buenos Aires. Hospitalized adults diagnosed with COVID-19 by nasal swab using real time transcription polymerase chain reaction or antigen were included. The primary outcome was the association between high plasma PCr values on hospital admission (≥8 mg/L) and mechanical ventilation requirement during hospitalization. Results: Of the 1,242 patients enrolled, 19.4% required mechanical ventilation and 11.7% died during the hospitalization. The PCr of the patients who required mechanical ventilation was higher than that of those who did not require mechanical ventilation (9.45 [5.20-18.70] mg/L vs 4.95 [1.80-10.70] mg/L; p < 0.01). PCr analyzed as a continuous variable (OR = 1.39; 95%CI 1.21-1.60; p < 0.001) and as a categorical variable (≥8 mg/L) (OR = 2.66; 95%CI 2.19 -3.78, p < 0.001) presented a significant association with the requirement of mechanical ventilation during hospitalization. Additionally, a significant association was found between PCr and in-hospital mortality. Conclusion: Plasma PCr on hospital admission could predict clinical evolution in adult patients hospitalized for COVID-19.