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01.12.2019 | Research article | Ausgabe 1/2019 Open Access

BMC Pulmonary Medicine 1/2019

Baseline characteristics and comorbidities in the CAnadian REgistry for Pulmonary Fibrosis

Zeitschrift:
BMC Pulmonary Medicine > Ausgabe 1/2019
Autoren:
J. H. Fisher, M. Kolb, M. Algamdi, J. Morisset, K. A. Johannson, S. Shapera, P. Wilcox, T. To, M. Sadatsafavi, H. Manganas, N. Khalil, N. Hambly, A. J. Halayko, A. S. Gershon, C. D. Fell, G. Cox, C. J. Ryerson
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Supplementary information

Supplementary information accompanies this paper at https://​doi.​org/​10.​1186/​s12890-019-0986-4.

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Abstract

Background

The CAnadian REgistry for Pulmonary Fibrosis (CARE-PF) is a multi-center, prospective registry designed to study the natural history of fibrotic interstitial lung disease (ILD) in adults. The aim of this cross-sectional sub-study was to describe the baseline characteristics, risk factors, and comorbidities of patients enrolled in CARE-PF to date.

Methods

Patients completed study questionnaires and clinical measurements at enrollment and each follow-up visit. Environmental exposures were assessed by patient self-report and comorbidities by the Charlson Comorbidity Index (CCI). Baseline characteristics, exposures, and comorbidities were described for the overall study population and for incident cases, and were compared across ILD subtypes.

Results

The full cohort included 1285 patients with ILD (961 incident cases (74.8%)). Diagnoses included connective tissue disease-associated ILD (33.3%), idiopathic pulmonary fibrosis (IPF) (24.7%), unclassifiable ILD (22.3%), chronic hypersensitivity pneumonitis (HP) (7.5%), sarcoidosis (3.2%), non-IPF idiopathic interstitial pneumonias (3.0%, including idiopathic nonspecific interstitial pneumonia (NSIP) in 0.9%), and other ILDs (6.0%). Patient-reported exposures were most frequent amongst chronic HP, but common across all ILD subtypes. The CCI was ≤2 in 81% of patients, with a narrow distribution and range of values.

Conclusions

CTD-ILD, IPF, and unclassifiable ILD made up 80% of ILD diagnoses at ILD referral centers in Canada, while idiopathic NSIP was rare when adhering to recommended diagnostic criteria. CCI had a very narrow distribution across our cohort suggesting it may be a poor discriminator in assessing the impact of comorbidities on patients with ILD.
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