Back to Journals » International Journal of Chronic Obstructive Pulmonary Disease » Volume 13

COPD phenotypes: differences in survival

Authors Hernández Vázquez J, Ali García I, Jiménez-García R, Álvaro Meca A, López de Andrés A, Matesanz Ruiz C, Buendía García MJ, de Miguel Díez J

Received 21 February 2018

Accepted for publication 26 April 2018

Published 20 July 2018 Volume 2018:13 Pages 2245—2251

DOI https://doi.org/10.2147/COPD.S166163

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Charles Downs

Peer reviewer comments 2

Editor who approved publication: Dr Richard Russell


Julio Hernández Vázquez,1 Ismael Ali García,1 Rodrigo Jiménez-García,2 Alejandro Álvaro Meca,2 Ana López de Andrés,2 Carmen Matesanz Ruiz,1 María Jesús Buendía García,1 Javier de Miguel Díez3

1Respiratory Department, Hospital Universitario Infanta Leonor, Madrid, Spain; 2Preventive Medicine and Public Health Teaching and Research Unit, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Madrid, Spain; 3Respiratory Department, Hospital General Universitario Gregorio Marañón, Facultad de Medicina, Universidad Complutense de Madrid (UCM), Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), Madrid, Spain

Background: The aim of the study was to analyze the characteristics and survival of a group of patients with COPD according to their clinical phenotype.
Patients and methods: The study population was selected from patients undergoing scheduled spirometry between January 1, 2011 and June 30, 2011 at the respiratory function laboratory of a teaching hospital and comprised those with a previous and confirmed diagnosis of COPD and forced expiratory volume in the first second (FEV1) of <70%. The patients selected were classified into 4 groups: positive bronchodilator response, non-exacerbator, exacerbator with emphysema, and exacerbator with chronic bronchitis. Patients were followed up until April 2017.
Results: We recruited 273 patients, of whom 89% were men. The distribution by phenotype was as follows: non-exacerbator, 47.2%; positive bronchodilator response, 25.8%; exacerbator with chronic bronchitis, 13.8%; and exacerbator with emphysema, 13.0%. A total of 90 patients died during follow-up (32.9%). Taking patients with a positive bronchodilator response as the reference category, the risk factors that were independently associated with death were older age (HR, 1.06; 95% CI, 1.03–1.09), lower FEV1 (HR, 0.98; 95% CI, 0.96–0.99), and exacerbator with chronic bronchitis phenotype (HR, 3.28; 95% CI, 1.53–7.03).
Conclusion: Classification of COPD patients by phenotype makes it possible to identify subgroups with different prognoses. Thus, mortality was greater in exacerbators with chronic bronchitis and lower in those with a positive bronchodilator response.

Keywords: COPD, phenotypes, positive bronchodilator response, chronic bronchitis, emphysema, exacerbator, mortality

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF]  View Full Text [HTML][Machine readable]