Are interstitial lung abnormalities associated with COPD? Anested case–control study

Francesca Bozzetti, Ilaria Paladini, Enrico Rabaiotti, Alessandro Franceschini, Veronica Alfieri, Alfredo Chetta, Ernesto Crisafulli, Mario Silva, Ugo Pastorino, Nicola Sverzellati

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: In this study, we tested the association between COPD and interstitial lung abnormality (ILA), notably in relation to the presence of computed tomography (CT) signs of lung fibrosis. Patients and methods: COPD cases were selected from participants undergoing lung cancer screening (Multicentric Italian Lung Detection trial) for airflow obstruction (n=311/2,303, 13.5%) and 146 consecutive patients with clinical COPD. In all, 457 COPD cases were selected and classified according to the stages of Global Initiative for Chronic Obstructive Lung Disease. A nested matching (case: control =1:2) according to age, sex, and smoking history was operated between each COPD case and two control subjects from Multicentric Italian Lung Detection trial without airflow obstruction. Low-dose CT scans of COPD cases and controls were reviewed for the presence of ILA, which were classified into definite or indeterminate according to the presence of signs of lung fibrosis. Results: The frequency of definite ILA was similar between COPD cases and controls (P=0.2), independent of the presence of signs of lung fibrosis (P=0.07). Combined definite and indeterminate ILA was homogeneously distributed across Global Initiative for Chronic Obstructive Lung Disease stages (P=0.6). Definite ILA was directly associated with current smoker status (odds ratio [OR] 4.05, 95% confidence interval [CI]: 2.2–7.4) and increasing pack-years (OR 1.01, 95% CI: 1–1.02). Subjects with any fibrotic ILA were more likely to be older (OR 1.17, 95% CI: 1.10–1.25) and male (OR 8.58, 95% CI: 1.58–68.9). Conclusion: There was no association between COPD and definite ILA. However, low-dose CT signs of lung fibrosis were also observed in COPD, and their clinical relevance is yet to be determined.

Original languageEnglish
Pages (from-to)1087-1096
Number of pages10
JournalInternational Journal of COPD
Volume11
Issue number1
DOIs
Publication statusPublished - May 26 2016

Keywords

  • Airspace enlargement with fibrosis
  • Chronic obstructive lung disease
  • Interstitial lung abnormality
  • Usual interstitial pneumonia

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Public Health, Environmental and Occupational Health
  • Health Policy

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