Prevalence of reduced lung diffusing capacity and CT scan findings in smokers without airflow limitation : a population-based study
García-Rio, Francisco (Centro de Investigación Biomédica en Red de Enfermedades Respiratorias)
Miravitlles, Marc (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Soriano, Joan B. (Hospital Universitario de la Princesa (Madrid))
Cosio, Borja G (Institut d'Investigació Sanitària Illes Balears)
Soler-Cataluña, Juan José (Hospital Arnau de Vilanova-Lliria)
Casanova, Ciro (Hospital Universitario Nuestra Señora de Candelaria (Santa Cruz de Tenerife))
de Lucas, Pilar (Hospital General Universitario Gregorio Marañón)
Alfageme, Inmaculada (Hospital Universitario Virgen de Valme (Sevilla, Andalusia))
Rodríguez González-Moro, José Miguel (Hospital Universitario Príncipe de Asturias (Alcalá de Henares, Madrid))
Sánchez Herrero, María Guadalupe (GSK)
Ancochea, Julio (Hospital Universitario de la Princesa (Madrid))
Universitat Autònoma de Barcelona

Date:	2023
Abstract:	Population distribution of reduced diffusing capacity of the lungs for carbon monoxide (DLCO) in smokers and main consequences are not properly recognised. The objectives of this study were to describe the prevalence of reduced DLCO in a population-based sample of current and former smoker subjects without airflow limitation and to describe its morphological, functional and clinical implications. A sample of 405 subjects aged 40 years or older with postbronchodilator forced expiratory volume in 1 s/forced vital capacity (FVC) >0. 70 was obtained from a random population-based sample of 9092 subjects evaluated in the EPISCAN II study. Baseline evaluation included clinical questionnaires, exhaled carbon monoxide (CO) measurement, spirometry, DLCO determination, 6 min walk test, routine blood analysis and low-dose CT scan with evaluation of lung density and airway wall thickness. In never, former and current smokers, prevalence of reduced DLCO was 6. 7%, 14. 4% and 26. 7%, respectively. Current and former smokers with reduced DLCO without airflow limitation were younger than the subjects with normal DLCO, and they had greater levels of dyspnoea and exhaled CO, greater pulmonary artery diameter and lower spirometric parameters, 6 min walk distance, daily physical activity and plasma albumin levels (all p<0. 05), with no significant differences in other chronic respiratory symptoms or CT findings. FVC and exhaled CO were identified as independent risk factors for low DLCO. Reduced DLCO is a frequent disorder among smokers without airflow limitation, associated with decreased exercise capacity and with CT findings suggesting that it may be a marker of smoking-induced early vascular damage.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Tobacco and the lung ; Lung Physiology ; Imaging/CT MRI etc ; Exercise
Published in:	BMJ Open Respiratory Research, Vol. 10 (january 2023) , ISSN 2052-4439

DOI: 10.1136/bmjresp-2022-001468
PMID: 36707127

11 p, 746.6 KB

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