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Chinese Journal of Lung Diseases(Electronic Edition) ›› 2025, Vol. 18 ›› Issue (03): 416-422. doi: 10.3877/cma.j.issn.1674-6902.2025.03.014

• Original articles • Previous Articles    

Value of NLR in patients with COPD with different blood eosinophil levels

Chunxue Song1, Liangliang Wang1, Xi Yuan1, Gengchen Xu1, Liu Liu1, Yinjuan Ma1, Qi Ding1, Xia Wei1,()   

  1. 1. Department of Pulmonary and Critical Care Medicine,the Ninth Hospital of Xi'an,Xi'an 710054,China
  • Received:2024-08-19 Online:2025-06-25 Published:2025-07-17
  • Contact: Xia Wei

Abstract:

Objective

Explore the significance of neutrophil/lymphocyte ratio (NLR) in patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) with different blood eosinophil (EOS)levels.

Methods

A total of 205 AECOPD patients hospitalized in the Department of Pulmonary and Critical Care Medicine of Xi'an Ninth Hospital from December 2020 to October 2023 were collected and divided into high blood EOS group (blood EOS≥3%) and low blood EOS group (blood EOS<3%) according to blood EOS level. The patients were divided into high NLR subgroup (NLR≥3.35) and low NLR subgroup (NLR<3.35).The clinical data,pulmonary function and immune inflammatory indexes were collected,and the differences between groups were compared.

Results

①The high blood EOS group exhibited significantly higher FeNO levels [23.0(16.5,37.5) vs. 18.0(12.3,23.0),P<0.05] but lower systemic inflammation markers,including WBC[5.7(4.8,6.9) vs. 6.6(5.3,8.2)],NEU% (61.6±10.9 vs. 71.0±10.7),NLR[2.6(1.8,3.7) vs. 3.6(2.4,6.5)],hsCRP[3.1(1.9,7.0) vs. 4.0(2.6,14.1)],and Fib [3.3(2.7,4.0) vs. 3.6(3.0,4.6)],compared to the low blood EOS group (P<0.05). ②In the low blood EOS group,compared with the low NLR group,the high NLR subgroup had higher mMRC grade,degree of inflammation (WBC,hsCRP),pulse concussion resistance (Z5,R5,R5-R20,X5,AX) (P<0.05),lower PaO2,traditional pulmonary function(FEV1%,FEV1/FVC,FEF50%,MMEF,MVV%),immune index (IgG,IgM,lymphocyte,CD3+ T cell and CD4+ T cell count) (P<0.05). ③In the high blood EOS group,compared with the low NLR subgroup,the degree of inflammation (hsCRP) and pulse concussion resistance (Fres) in the high NLR subgroup were higher(P<0.05),while the traditional pulmonary function (FEV1%) and immune indexes (IgG,IgM,lymphocyte,CD3+ T cell,CD8+ T cell and B cell count) were lower (P<0.05). ④In AECOPD patients stratified by blood EOS levels,NLR showed weak negative correlations with FEV1(the low blood EOS group:r=-0.219,P =0.008; the high blood EOS group:r=-0.302,P =0.020) and FEV1% (the low blood EOS group:r=-0.217,P=0.009; the high blood EOS group:r=-0.258,P =0.049).

Conclusion

The inflammatory reaction,pulmonary function and immune function of the high EOS subgroup of the AECOPD patients with different blood EOS levels were more severe than those of the low NLR subgroup,especially in the group with blood EOS<3%,and accompanied by more severe dyspnea. Monitoring blood Eos level,MLR and pulmonary function is clinically significant.

Key words: Acute exacerbation of chronic obstructive pulmonary disease, Eosinophils, Neutrophils/lymphocytes

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