Inflammatory patterns in fixed airflow obstruction are dependent on the presence of asthma

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Mogensen, I (Author) Other; Jacinto T (Author) FMUP; Alving, K (Author) Other; Fonseca, J (Author) FMUP; Janson, C (Author) Other; Malinovschi, A (Author) Other

Journal

Title: PLoS ONE

Vol. 15

ISSN: 1932-6203

Publisher: Public Library of Science

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00T-631

DOI: 10.1371/journal.pone.0243109

Abstract (EN): Rationale Fixed airflow obstruction (FAO) can complicate asthma. Inflammation is a proposed underlying mechanism. Objective Our aim in this cross-sectional investigation was to evaluate the blood leucocyte pattern and level of exhaled nitric oxide in asthmatics and non-asthmatics with or without FAO. Methods A total of 11,579 individuals aged >= 20 years from the US National Health and Nutrition Examination Survey were included. They were grouped as: controls without asthma and FAO (n = 9,935), asthmatics without FAO (n = 674), asthmatics with FAO (n = 180) and non-asthmatics with FAO (n = 790). FAO was defined as post-bronchodilator FEV1/FVC < lower limit of normal. Exhaled nitric oxide >= 25ppb, blood eosinophil levels >= 300 cells/mu L, and blood neutrophil levels >= 5100 cells/mu L were defined as elevated. Stratified analyses for smoking and smoking history were performed. Results Elevated blood eosinophil levels were more common in all groups compared to the controls, with the highest prevalence in the group with asthma and fixed airflow obstruction (p<0.01). In a multiple logistic regression model adjusted for potential confounders including smoking, the asthma groups had significantly higher odds ratios for elevated B-Eos levels compared to the control group (odds ratio 1.4, (confidence interval: 1.1-1.7) for the asthma group without fixed airflow obstruction and 2.5 (1.4-4.2) for the asthma group with fixed airflow obstruction). The group with fixed airflow obstruction without asthma had higher odds ratio for elevated blood neutrophil levels compared to the controls: 1.4 (1.1-1.8). Smoking and a history of smoking were associated to elevated B-Neu levels. Conclusion Fixed airflow obstruction in asthma was associated with elevated blood eosinophil levels, whereas fixed airflow obstruction without asthma was associated with elevated blood neutrophil levels.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13