Biomarkers as a Prognostic Factor in COPD Exacerbation: A Cohort Study

Area of Science:

• Pulmonary Medicine
• Critical Care Medicine
• Clinical Biomarkers

Background:

• Acute exacerbations of COPD (AECOPD) significantly contribute to hospitalizations and mortality in adults.
• Predictive tools for AECOPD patient outcomes during hospitalization are limited.
• Investigating novel biomarkers for prognosis in AECOPD is crucial.

Purpose of the Study:

• To evaluate the clinical utility of C-reactive protein (CRP), mean platelet volume (MPV), eosinophil count, and neutrophil-to-lymphocyte ratio (NLR) as in-hospital prognostic factors for AECOPD patients.
• To identify biomarkers that predict in-hospital death, ICU admission, and hospital length-of-stay in AECOPD.

Main Methods:

• Prospective cohort study of 610 hospitalized AECOPD patients (2017-2020) across three hospitals in Medellín.
• Multivariate analysis to assess the association between biomarkers (CRP, MPV, eosinophils, NLR) and primary outcomes.
• Primary outcomes included a composite of in-hospital death and/or ICU admission, and hospital length-of-stay.

Main Results:

• The neutrophil-to-lymphocyte ratio (NLR) > 5 was significantly associated with an increased risk of in-hospital death or ICU admission (OR: 3; 95% CI: 1.5-6).
• An NLR > 5 was also linked to a lower probability of alive discharge (SHR: 0.73; 95% CI: 0.57-0.94), indicating a longer hospital stay.
• Other tested biomarkers (CRP, MPV, eosinophils) did not show significant association with the primary outcomes in the adjusted analysis.

Conclusions:

• The neutrophil-to-lymphocyte ratio (NLR) > 5 serves as a robust predictor for adverse in-hospital outcomes in AECOPD patients.
• Elevated NLR is associated with increased mortality risk, higher ICU admission rates, and prolonged hospitalization.
• NLR measurement offers valuable prognostic information for managing hospitalized AECOPD patients.