Mortality and cardiovascular and respiratory morbidity in individuals with impaired FEV (PURE): an international, community-based cohort study.

Authors:
Mylinh Duong
Mylinh Duong
McMaster University
Canada
Dr. Shofiqul Islam, PhD
Dr. Shofiqul Islam, PhD
Population Health Research Institute
Senior Biostatistician
Hamilton, Ontario | Canada
Sumathy Rangarajan
Sumathy Rangarajan
Population Health Research Institute
Canada
Om Kurmi
Om Kurmi
University of Birmingham
United Kingdom
Koon Teo
Koon Teo
Population Health Research Institute
Canada
Kieran Killian
Kieran Killian
McMaster University
Canada
Gilles Dagenais
Gilles Dagenais
Institut Universitaire de Cardiologie et de Pneumologie de Québec
Canada

Lancet Glob Health 2019 May;7(5):e613-e623

Population Health Research Institute, Department of Medicine, McMaster University and Hamilton Health Sciences, Hamilton, ON, Canada.

Background: The associations between the extent of forced expiratory volume in 1 s (FEV) impairment and mortality, incident cardiovascular disease, and respiratory hospitalisations are unclear, and how these associations might vary across populations is unknown.

Methods: In this international, community-based cohort study, we prospectively enrolled adults aged 35-70 years who had no intention of moving residences for 4 years from rural and urban communities across 17 countries. A portable spirometer was used to assess FEV. FEV values were standardised within countries for height, age, and sex, and expressed as a percentage of the country-specific predicted FEV value (FEV%). FEV% was categorised as no impairment (FEV% ≥0 SD from country-specific mean), mild impairment (FEV% <0 SD to -1 SD), moderate impairment (FEV% <-1 SD to -2 SDs), and severe impairment (FEV% <-2 SDs [ie, clinically abnormal range]). Follow-up was done every 3 years to collect information on mortality, cardiovascular disease outcomes (including myocardial infarction, stroke, sudden death, or congestive heart failure), and respiratory hospitalisations (from chronic obstructive pulmonary disease, asthma, pneumonia, tuberculosis, or other pulmonary conditions). Fully adjusted hazard ratios (HRs) were calculated by multilevel Cox regression.

Findings: Among 126 359 adults with acceptable spirometry data available, during a median 7·8 years (IQR 5·6-9·5) of follow-up, 5488 (4·3%) deaths, 5734 (4·5%) cardiovascular disease events, and 1948 (1·5%) respiratory hospitalisation events occurred. Relative to the no impairment group, mild to severe FEV% impairments were associated with graded increases in mortality (HR 1·27 [95% CI 1·18-1·36] for mild, 1·74 [1·60-1·90] for moderate, and 2·54 [2·26-2·86] for severe impairment), cardiovascular disease (1·18 [1·10-1·26], 1·39 [1·28-1·51], 2·02 [1·75-2·32]), and respiratory hospitalisation (1·39 [1·24-1·56], 2·02 [1·75-2·32], 2·97 [2·45-3·60]), and this pattern persisted in subgroup analyses considering country income level and various baseline risk factors. Population-attributable risk for mortality (adjusted for age, sex, and country income) from mildly to moderately reduced FEV% (24·7% [22·2-27·2]) was larger than that from severely reduced FEV% (3·7% [2·1-5·2]) and from tobacco use (19·7% [17·2-22·3]), previous cardiovascular disease (5·5% [4·5-6·5]), and hypertension (17·1% [14·6-19·6]). Population-attributable risk for cardiovascular disease from mildly to moderately reduced FEV was 17·3% (14·8-19·7), second only to the contribution of hypertension (30·1% [27·6-32·5]).

Interpretation: FEV is an independent and generalisable predictor of mortality, cardiovascular disease, and respiratory hospitalisation, even across the clinically normal range (mild to moderate impairment).

Funding: Population Health Research Institute, the Canadian Institutes of Health Research, Heart and Stroke Foundation of Ontario, Ontario Ministry of Health and Long-Term Care, AstraZeneca, Sanofi-Aventis, Boehringer Ingelheim, Servier, and GlaxoSmithKline, Novartis, and King Pharma. Additional funders are listed in the appendix.

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Source
https://linkinghub.elsevier.com/retrieve/pii/S2214109X193007
Publisher Site
http://dx.doi.org/10.1016/S2214-109X(19)30070-1DOI Listing
May 2019
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