Neutrophil-to-Lymphocyte Ratio Predicts Clinical Outcome of Severe Acute Exacerbation of COPD in Frequent Exacerbators

• Published in: International journal of chronic obstructive pulmonary disease Vol. 16; pp. 341 - 349
• Main Authors: Lu, Fang-Ying, Chen, Rong, Li, Ning, Sun, Xian-Wen, Zhou, Min, Li, Qing-Yun, Guo, Yi
• Format: Journal Article
• Language: English
• Published: New Zealand Dove Medical Press Limited 01.01.2021; Dove Medical Press Ltd; Dove; Dove Medical Press
• Subjects: Airway management; Biomarkers; Body mass index; China; Chronic obstructive pulmonary disease; Clinical outcomes; copd; Disease Progression; frequent exacerbator; Hospitalization; Hospitals; Humans; Intensive care; Lung diseases, Obstructive; Lymphocytes; Mortality; Neutrophils; nlr; Original Research; Patient outcomes; Prognosis; Pulmonary Disease, Chronic Obstructive - diagnosis; Pulmonary Disease, Chronic Obstructive - therapy; Retrospective Studies; severe exacerbation; Ventilators; worse outcome; China; severe exacerbation; worse outcome; NLR; frequent exacerbator; COPD
• ISSN: 1178-2005; 1176-9106; 1178-2005
• DOI: 10.2147/COPD.S290422

Frequent exacerbators are a specific phenotype of chronic obstructive pulmonary disease (COPD), whose clinical characteristics and prognostic biomarkers during severe acute exacerbation (AECOPD) have not yet been fully elucidated. The aim of this study was to investigate the clinical features of severe AECOPD in frequent exacerbators and explore the predictive value of the neutrophil-to-lymphocyte ratio (NLR) for outcome in this phenotype during severe exacerbation. A total of 604 patients with severe AECOPD were retrospectively included in the study. Subjects were defined as frequent exacerbators if they experienced two or more exacerbations in the past year. Clinical characteristics and worse outcome (ICU admission, or invasive ventilation, or in-hospital mortality) during severe AECOPD were compared between frequent exacerbators and non-frequent ones. Furthermore, the relationship between NLR and worse outcome in frequent exacerbators was analyzed using logistic regression and receiver operating characteristic (ROC). Among 604 patients with severe AECOPD, 282 (46.69%) were frequent exacerbators and 322 (53.31%) were non-frequent exacerbators. Compared with the non-frequent ones, frequent exacerbators presented higher levels of NLR (5.93 [IQR, 3.40-9.28] vs 4.41 [IQR, 2.74-6.80]; <0.001), and more worse outcome incidence (58 [20.57%] vs 38 [11.80%]; =0.003). Moreover, among the frequent exacerbators, NLR levels in the patients with worse outcome were much higher than in those without worse outcome (11.09 [IQR, 7.74-16.49] vs 5.28 [IQR, 2.93-7.93]; <0.001). Increased NLR was significantly associated with a higher risk of worse outcome in frequent exacerbators (OR, 1.43; 95% CI, 1.28-1.64; <0.001). Furthermore, ROC analysis revealed that a cut-off value of 10.23, NLR could predict worse outcome of severe AECOPD in frequent exacerbators (sensitivity 62.1%, specificity 92.0%, AUC 0.833). Frequent exacerbators exhibited an increased level of NLR and a higher proportion of worse outcome during severe AECOPD. NLR is expected to be a promising predictive biomarker for the prognosis of severe AECOPD in frequent exacerbators.