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Sönnerfors P, Jacobson PK, Andersson A, Behndig A, Bjermer L, Blomberg A, Blomqvist H, Erjefält J, Friberg M, Lamberg Lundström K, Lundborg A, Malinovschi A, Persson HL, Tufvesson E, Wheelock Å, Janson C, Sköld CM. The challenges of recruiting never-smokers with chronic obstructive pulmonary disease from the large population-based Swedish CArdiopulmonary bioImage study (SCAPIS) cohort. Eur Clin Respir J 2024; 11:2372903. [PMID: 39015382 PMCID: PMC11251440 DOI: 10.1080/20018525.2024.2372903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 06/22/2024] [Indexed: 07/18/2024] Open
Abstract
Background A substantial proportion of individuals with COPD have never smoked, and it is implied to be more common than previously anticipated but poorly studied. Aim To describe the process of recruitment of never-smokers with COPD from a population-based cohort (n = 30 154). Methods We recruited never-smokers with COPD, aged 50-75 years, from six University Hospitals, based on: 1) post broncho-dilator forced expiratory volume in 1 second/forced vital capacity (FEV1/FVC) < 0.70 and 2) FEV1 50-100% of predicted value and 3) being never-smokers (self-reported). In total 862 SCAPIS participants were identified, of which 652 were reachable and agreed to a first screening by telephone. Altogether 128 (20%) were excluded due to previous smoking or declined participation. We also applied a lower limit of normal (LLN) of FEV1/FVC (z-score<-1.64) according to the Global Lung Initiative to ensure a stricter definition of airflow obstruction. Results Data on respiratory symptoms, health status, and medical history were collected from 492 individuals, since 32 were excluded at a second data review (declined or previous smoking), prior to the first visit. Due to not matching the required lung function criteria at a second spirometry, an additional 334 (68%) were excluded. These exclusions were by reason of: FEV1/FVC ≥0.7 (49%), FEV1 > 100% of predicted (26%) or z-score ≥ -1,64 (24%). Finally, 154 never-smokers with COPD were included: 56 (36%) women, (mean) age 60 years, FEV1 84% of predicted, FEV1/FVC: 0.6, z-score: -2.2, Oxygen saturation: 97% and BMI: 26.8 kg/m2. Conclusions The challenges of a recruitment process of never-smokers with COPD were shown, including the importance of correct spirometry testing and strict inclusion criteria. Our findings highlight the importance of repeated spirometry assessments for improved accuracy in diagnosing COPD.
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Affiliation(s)
- Pernilla Sönnerfors
- Respiratory Medicine Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
- Medical Unit Occupational Therapy and Physiotherapy, Women´s Health and Allied Health Professionals Theme, Karolinska University Hospital, Stockholm, Sweden
| | - Petra Kristina Jacobson
- Department of Respiratory Medicine in Linköping, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Anders Andersson
- COPD Center, Department of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Gothenburg, Sweden
- COPD Center Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Annelie Behndig
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
| | - Leif Bjermer
- Department of Clinical Sciences, Respiratory medicine, Allergology and Palliative Medicine, Lund University, Lund, Sweden
| | - Anders Blomberg
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
| | - Heléne Blomqvist
- Respiratory Medicine Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
- Department of Respiratory Medicine and Allergy, Karolinska University Hospital, Stockholm, Sweden
| | - Jonas Erjefält
- Unit of Airway inflammation, Department of Experimental Medicine Sciences, Lund University, Lund, Sweden
| | - Maria Friberg
- Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
| | - Kristina Lamberg Lundström
- Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
| | - Anna Lundborg
- COPD Center, Department of Respiratory Medicine and Allergology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Andrei Malinovschi
- Department of Medical Sciences, Clinical Physiology, Uppsala University, Uppsala, Sweden
| | - Hans Lennart Persson
- Department of Respiratory Medicine in Linköping, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Ellen Tufvesson
- Department of Clinical Sciences, Respiratory medicine, Allergology and Palliative Medicine, Lund University, Lund, Sweden
| | - Åsa Wheelock
- Respiratory Medicine Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
- Department of Respiratory Medicine and Allergy, Karolinska University Hospital, Stockholm, Sweden
| | - Christer Janson
- Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
| | - Carl Magnus Sköld
- Respiratory Medicine Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
- Department of Respiratory Medicine and Allergy, Karolinska University Hospital, Stockholm, Sweden
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Kwok WC, Chau CH, Tam TCC, Lam FM, Ho JCM. Variability of Blood Eosinophil Count at Stable-State in Predicting Exacerbation Risk of Chronic Obstructive Pulmonary Disease. Int J Chron Obstruct Pulmon Dis 2023; 18:1145-1153. [PMID: 37332837 PMCID: PMC10274840 DOI: 10.2147/copd.s401357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 04/06/2023] [Indexed: 06/20/2023] Open
Abstract
Background Chronic obstructive pulmonary disease (COPD) phenotyping using stable-state blood eosinophil level was shown to have prognostic implication in terms of exacerbation risk. However, using a single cut-off of blood eosinophil level to predict clinical outcome has been challenged. There have been suggestions that variability of blood eosinophil count at stable-state could provide additional information on exacerbation risk. Methods A retrospective cohort study was conducted in a major regional hospital and a tertiary respiratory referral centre in Hong Kong, including 275 Chinese patients with COPD, to investigate the possible role of variability of blood eosinophil count at stable-state to predict COPD exacerbation risk in one year. Results Higher variability of baseline eosinophil count, which is defined as the difference of the minimal and maximal eosinophil count at stable-state, was associated with increased risk of COPD exacerbation in the follow-up period with adjusted OR (aOR) of 1.001 (95% CI = 1.000-1.003, p-value = 0.050) for 1 unit (cells/µL) increase in variability of baseline eosinophil count, aOR of 1.72 (95% CI = 1.00-3.58, p-value = 0.050) for 1 SD increase in variability of baseline eosinophil count and aOR of 1.06 (95% CI = 1.00-1.13) for 50 cells/µL increase in variability of baseline eosinophil count. The AUC by ROC analysis was 0.862 (95% CI = 0.817-0.907, p-value < 0.001). The cut-off for variability of baseline eosinophil count identified was 50 cells/µL, with sensitivity of 82.9% and specificity of 79.3%. Similar findings were also shown in the subgroup with stable-state baseline eosinophil count below 300 cells/µL. Conclusion Variability of baseline eosinophil count at stable-state might predict the exacerbation risk of COPD, exclusively among patients with baseline eosinophil count below 300 cells/µL. The cut-off value for variability was 50 cells/µValidation of the study findings in large scale prospective study would be meaningful.
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Affiliation(s)
- Wang Chun Kwok
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China
| | - Chi Hung Chau
- Tuberculosis and Chest Unit, Grantham Hospital, Hong Kong Special Administrative Region, People’s Republic of China
| | - Terence Chi Chun Tam
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China
| | - Fai Man Lam
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China
| | - James Chung Man Ho
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China
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Harsløf M, Pedersen KM, Afzal S, Davey Smith G, Nordestgaard BG. Lower levels of small HDL particles associated with increased infectious disease morbidity and mortality: a population-based cohort study of 30 195 individuals. Cardiovasc Res 2023; 119:957-968. [PMID: 36537045 DOI: 10.1093/cvr/cvac194] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 09/29/2022] [Accepted: 11/04/2022] [Indexed: 12/24/2022] Open
Abstract
AIMS Low levels of HDL cholesterol have been associated with increased risk of infectious disease morbidity and mortality. Nuclear magnetic resonance (NMR) spectroscopy permits the measurement of HDL particle count and allows further subclassification according to particle size. We tested the hypothesis that low number of different HDL subfractions is associated with increased infectious disease morbidity and mortality. METHODS AND RESULTS HDL particle counts were measured using NMR spectroscopy in 30 195 individuals aged 22-99 years from the Copenhagen General Population Study. Using multiple-event Cox regression and cause-specific hazard models, we assessed risk of hospitalizations due to infection and infectious disease-related death, from 2003 through 2018. During follow-up, 9303 individuals had one or more infectious disease events, and 1558 experienced infectious disease-related death. In multifactorial adjusted analyses, low number of small and medium HDL particles was associated with increased risk of any infection and infectious disease-related death, whereas low number of large and extra-large HDL particles was not. A very high number of small and medium HDL particles was also associated with increased risk of any infection, but not with infectious disease-related death. For small and medium HDL particles and compared to individuals in the 91-95th percentile, hazard ratios (HRs) in individuals in the lowest percentile were 2.31 (95% confidence interval: 1.75, 3.05) for any infection and 3.23 (2.08, 5.02) for infectious disease-related death. For the highest percentile, corresponding HRs were 1.36 (1.07, 1.74) and 1.06 (0.57, 1.98), respectively. Individuals in the lowest percentile had increased risk of pneumonia (HR: 1.86; 95% confidence interval: 1.30, 2.65), sepsis (2.17; 1.37, 3.35), urinary tract infection (1.76; 1.17, 2.63), skin infection (1.87; 1.24, 2.81), gastroenteritis (1.78; 1.01, 3.16), and other infections (2.57; 1.28, 5.16). CONCLUSION Low number of the small HDL particles was associated with increased infectious disease morbidity and mortality.
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Affiliation(s)
- Mads Harsløf
- Department of Clinical Biochemistry, Copenhagen University Hospital, Herlev and Gentofte Hospital, Borgmester Ib Juuls Vej 73, DK-2730 Herlev, Denmark
- The Copenhagen General Population Study, Copenhagen University Hospital, Herlev and Gentofte Hospital, Borgmester Ib Juuls Vej 73, DK-2730 Herlev, Denmark
| | - Kasper M Pedersen
- Department of Clinical Biochemistry, Copenhagen University Hospital, Herlev and Gentofte Hospital, Borgmester Ib Juuls Vej 73, DK-2730 Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Shoaib Afzal
- Department of Clinical Biochemistry, Copenhagen University Hospital, Herlev and Gentofte Hospital, Borgmester Ib Juuls Vej 73, DK-2730 Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - George Davey Smith
- MRC Integrative Epidemiology Unit (IEU), Bristol Medical School, University of Bristol, BS8 2BN Bristol, United Kingdom
- Population Health Sciences, Bristol Medical School, University of Bristol, BS8 2BN Bristol, United Kingdom
| | - Børge G Nordestgaard
- Department of Clinical Biochemistry, Copenhagen University Hospital, Herlev and Gentofte Hospital, Borgmester Ib Juuls Vej 73, DK-2730 Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark
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Yang IA, Jenkins CR, Salvi SS. Chronic obstructive pulmonary disease in never-smokers: risk factors, pathogenesis, and implications for prevention and treatment. THE LANCET. RESPIRATORY MEDICINE 2022; 10:497-511. [PMID: 35427530 DOI: 10.1016/s2213-2600(21)00506-3] [Citation(s) in RCA: 125] [Impact Index Per Article: 62.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 10/19/2021] [Accepted: 11/09/2021] [Indexed: 12/29/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) was traditionally thought to be caused by tobacco smoking. However, recognition of the importance of non-smoking-related risk factors for COPD has increased over the past decade, with evidence on the burden, risk factors, and clinical presentations of COPD in never-smokers. About half of all COPD cases worldwide are due to non-tobacco-related risk factors, which vary by geographical region. These factors include air pollution, occupational exposures, poorly controlled asthma, environmental tobacco smoke, infectious diseases, and low socioeconomic status. Impaired lung growth during childhood, caused by a range of early-life exposures, is associated with an increased risk of COPD. Potential mechanisms for the pathogenesis of COPD in never-smokers include inflammation, oxidative stress, airway remodelling, and accelerated lung ageing. Compared with smokers who develop COPD, never-smokers with COPD have relatively mild chronic respiratory symptoms, little or no emphysema, milder airflow limitation, and fewer comorbidities; however, exacerbations can still be frequent. Further research-including epidemiological, translational, clinical, and implementation studies-is needed to address gaps in understanding and to advance potential solutions to reduce the burden of COPD in never-smokers.
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Affiliation(s)
- Ian A Yang
- UQ Thoracic Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, QLD, Australia; Department of Thoracic Medicine, The Prince Charles Hospital, Metro North Health, Brisbane, QLD, Australia.
| | - Christine R Jenkins
- Respiratory Group, The George Institute for Global Health, University of New South Wales, Sydney, NSW, Australia; Department of Thoracic Medicine, Concord General Hospital, Sydney, NSW, Australia; Concord Clinical School, University of Sydney, Sydney, NSW, Australia
| | - Sundeep S Salvi
- Pulmocare Research and Education (PURE) Foundation, Pune, Maharashtra, India; Faculty of Health Sciences, Symbiosis International (Deemed University), Pune, Maharashtra, India
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Baba RY, Zhang Y, Shao Y, Berger KI, Goldring RM, Liu M, Kazeros A, Rosen R, Reibman J. COPD in Smoking and Non-Smoking Community Members Exposed to the World Trade Center Dust and Fumes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19074249. [PMID: 35409931 PMCID: PMC8999000 DOI: 10.3390/ijerph19074249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/23/2022] [Accepted: 03/28/2022] [Indexed: 01/18/2023]
Abstract
Background: The characteristics of community members exposed to World Trade Center (WTC) dust and fumes with Chronic Obstructive Pulmonary Disease (COPD) can provide insight into mechanisms of airflow obstruction in response to an environmental insult, with potential implications for interventions. Methods: We performed a baseline assessment of respiratory symptoms, spirometry, small airway lung function measures using respiratory impulse oscillometry (IOS), and blood biomarkers. COPD was defined by the 2019 GOLD criteria for COPD. Patients in the WTC Environmental Health Center with <5 or ≥5 pack year smoking history were classified as nonsmoker-COPD (ns-COPD) or smoker-COPD (sm-COPD), respectively. Main Results: Between August 2005 and March 2018, 467 of the 3430 evaluated patients (13.6%) fit criteria for COPD. Among patients with COPD, 248 (53.1%) were ns-COPD. Patients with ns-COPD had measures of large airway function (FEV1) and small airway measures (R5−20, AX) that were less abnormal than those with sm-COPD. More ns-COPD compared to sm-COPD had a bronchodilator (BD) response measured by spirometry (24 vs. 14%, p = 0.008) or by IOS (36 vs. 21%, p = 0.002). Blood eosinophils did not differ between ns-COPD and sm-COPD, but blood neutrophils were higher in sm-COPD compared to ns-COPD (p < 0.001). Those with sm-COPD were more likely to be WTC local residents than ns-COPD (p = 0.007). Conclusions: Spirometry findings and small airway measures, as well as inflammatory markers, differed between patients with ns-COPD and sm-COPD. These findings suggest potential for differing mechanisms of airway injury in patients with WTC environmental exposures and have potential therapeutic implications.
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Affiliation(s)
- Ridhwan Y. Baba
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (R.Y.B.); (K.I.B.); (R.M.G.); (A.K.)
| | - Yian Zhang
- Division of Biostatistics, Department of Population Health and Environmental Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (Y.Z.); (Y.S.); (M.L.)
| | - Yongzhao Shao
- Division of Biostatistics, Department of Population Health and Environmental Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (Y.Z.); (Y.S.); (M.L.)
| | - Kenneth I. Berger
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (R.Y.B.); (K.I.B.); (R.M.G.); (A.K.)
| | - Roberta M. Goldring
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (R.Y.B.); (K.I.B.); (R.M.G.); (A.K.)
| | - Mengling Liu
- Division of Biostatistics, Department of Population Health and Environmental Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (Y.Z.); (Y.S.); (M.L.)
| | - Angeliki Kazeros
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (R.Y.B.); (K.I.B.); (R.M.G.); (A.K.)
| | - Rebecca Rosen
- Department of Psychiatry, New York University Grossman School of Medicine, New York, NY 10016, USA;
| | - Joan Reibman
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA; (R.Y.B.); (K.I.B.); (R.M.G.); (A.K.)
- Department of Environmental Medicine, New York University Grossman School of Medicine, New York, NY 10016, USA
- Correspondence:
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Benson VS, Hartl S, Barnes N, Galwey N, Van Dyke MK, Kwon N. Blood eosinophil counts in the general population and airways disease: a comprehensive review and meta-analysis. Eur Respir J 2022; 59:2004590. [PMID: 34172466 PMCID: PMC8756293 DOI: 10.1183/13993003.04590-2020] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 05/26/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND The clinical context for using blood eosinophil (EOS) counts as treatment-response biomarkers in asthma and COPD requires better understanding of EOS distributions and ranges. We describe EOS distributions and ranges published in asthma, COPD, control (non-asthma/COPD) and general populations. METHODS We conducted a comprehensive literature review and meta-analysis of observational studies (January 2008 to November 2018) that included EOS counts in asthma, severe asthma, COPD, control and general populations. Excluded studies had total sample sizes <200, EOS as inclusion criterion, hospitalised population only and exclusively paediatric participants. RESULTS Overall, 91 eligible studies were identified, most had total-population-level data available: asthma (39 studies), severe asthma (12 studies), COPD (23 studies), control (seven studies) and general populations (14 studies); some articles reported data for multiple populations. Reported EOS distributions were right-skewed (seven studies). Reported median EOS counts ranged from 157-280 cells·µL-1 (asthma, 22 studies); 200-400 cells·µL-1 (severe asthma, eight studies); 150-183 cells·µL-1 (COPD, six studies); and 100-160 cells·µL-1 (controls, three studies); and 100-200 cells·µL-1 (general populations, six studies). The meta-analysis showed that observed variability was mostly between studies rather than within studies. Factors reportedly associated with higher blood EOS counts included current smoking, positive skin-prick test, elevated total IgE, comorbid allergic rhinitis, age ≤18 years, male sex, spirometric asthma/COPD diagnosis, metabolic syndrome and adiposity. CONCLUSION EOS distribution and range varied by study population, and were affected by clinical factors including age, smoking history and comorbidities, which, regardless of severity, should be considered during treatment decision-making.
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Affiliation(s)
- Victoria S Benson
- Epidemiology, Value Evidence and Outcomes (VEO), Global Medical R&D, GlaxoSmithKline, Brentford, UK
| | - Sylvia Hartl
- Dept of Respiratory and Critical Care Medicine and Ludwig Boltzmann Institute for Lung Health, Clinic Penzing, WiGev and Sigmund Freud University, Medical School, Vienna, Austria
| | - Neil Barnes
- Respiratory Therapy Area, GlaxoSmithKline, Brentford, UK
- William Harvey Institute, Barts and The London School of Medicine and Dentistry, London, UK
| | | | - Melissa K Van Dyke
- Epidemiology, Value Evidence and Outcomes (VEO), Global Medical R&D, GlaxoSmithKline, Upper Providence, PA, USA
| | - Namhee Kwon
- Respiratory Research and Development, GlaxoSmithKline, Brentford, UK
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Çolak Y, Nordestgaard BG, Lange P, Vestbo J, Afzal S. Supernormal lung function and risk of COPD: A contemporary population-based cohort study. EClinicalMedicine 2021; 37:100974. [PMID: 34195585 PMCID: PMC8225980 DOI: 10.1016/j.eclinm.2021.100974] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 05/22/2021] [Accepted: 06/01/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Investigation of the natural history of chronic obstructive pulmonary disease (COPD) has led to the recognition that individuals with higher than normal lung function may have lower risk of developing COPD. We tested the hypothesis that individuals with supernormal lung function have lower risk of COPD. METHODS We followed 108,246 adults from the Copenhagen General Population Study recruited between 2003 and 2015 for clinical COPD outcomes until 2018. A subset of 16,892 attended another examination approximately 10 years later, allowing to investigate lung function decline and COPD development (forced expiratory volume in 1 se (FEV1)/forced vital capacity (FVC)<0·70 and FEV1<80% predicted with chronic respiratory symptom). Supernormal lung function was defined as FEV1>upper limit of normal (ULN). FINDINGS At baseline, 3944(4%) had supernormal lung function, 91,938(85%) normal lung function, and 12,364(11%) had below normal lung function. Individuals with baseline supernormal versus normal lung function had higher FEV1 decline but did not differ in FEV1/FVC decline. None had COPD at 10 years in those with supernormal lung function, while 3% had in those with normal lung function. Early-life risk factors associated with COPD development and smoking exposure in different stages of life were less common in individuals with supernormal lung function. Compared to individuals with normal lung function, multivariable adjusted hazard ratios in those with supernormal lung function were 0·19(95% confidence interval:0·08-0·46) for acute obstructive lung disease hospitalisations, 0·56(0·45-0·69) for pneumonia hospitalisations, and 0·81(0·72-0·91) for all-cause mortality. INTERPRETATION Supernormal lung function is associated with lower risk of developing COPD. FUNDING Herlev and Gentofte Hospital and Lundbeck Foundation.
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Affiliation(s)
- Yunus Çolak
- Department of Respiratory Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Børge G. Nordestgaard
- The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
| | - Peter Lange
- Department of Respiratory Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Public Health, Section of Epidemiology, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen Vestbo
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Manchester Academic Health Science Centre, University of Manchester, and Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Shoaib Afzal
- The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Corresponding author at: The Copenhagen General Population Study, Copenhagen University Hospital - Herlev and Gentofte, Herlev, Denmark.
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Çolak Y, Afzal S, Nordestgaard BG, Lange P, Vestbo J. Importance of Early COPD in Young Adults for Development of Clinical COPD: Findings from the Copenhagen General Population Study. Am J Respir Crit Care Med 2021; 203:1245-1256. [PMID: 33142077 PMCID: PMC8456466 DOI: 10.1164/rccm.202003-0532oc] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 11/03/2020] [Indexed: 11/16/2022] Open
Abstract
Rationale: Individuals who will develop chronic obstructive pulmonary disease (COPD) could be identified at an early age before clinical manifestations appear. Objectives: We investigated risk of clinical COPD 10 years later in young adults from the general population with and without early COPD with a focus on smoking exposure. Methods: We included 14,870 individuals aged 20-100 years from the Copenhagen General Population Study with spirometry 10 years apart. Early COPD was defined as baseline FEV1/FVC less than the lower limit of normal in individuals aged <50 years. Outcomes included clinical COPD at final examination 10 years later (chronic respiratory symptoms with FEV1/FVC <0.70 and FEV1 <80% predicted) and acute exacerbation hospitalizations during follow-up. Measurements and Main Results: Among 5,497 individuals aged <50 years at baseline with FEV1/FVC ≥0.70, 104 (3%) developed clinical COPD 10 years later; 4% of smokers with ≥10 pack-years had early COPD; 3% of smokers with <10 pack-years had early COPD; and 2% of never-smokers had early COPD. Among smokers with ≥10 pack-years, 24% developed clinical COPD in those with early COPD versus 4% in those without early COPD. Corresponding numbers were 10% and 1% in smokers with <10 pack-years and 3% and <1% in never-smokers, respectively. Among individuals with early COPD, odds ratios for clinical COPD 10 years later were 7.77 (95% confidence interval [CI], 4.10-14.7) in smokers with ≥10 pack-years and 8.56 (95% CI, 4.92-14.9) in all smokers, whereas hazard ratios for acute exacerbation hospitalizations were 4.16 (95% CI, 1.66-10.5) and 4.33 (95% CI, 1.89-9.93), respectively. Results were validated in the Copenhagen City Heart Study. Conclusions: Depending on amount of smoking exposure, <24% of young adults in the general population with early COPD develop clinical COPD 10 years later. A smoking exposure threshold for early COPD should be reconsidered, as younger individuals are less represented in those with high smoking exposure.
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Affiliation(s)
- Yunus Çolak
- Department of Clinical Biochemistry
- The Copenhagen General Population Study, and
- Faculty of Health and Medical Sciences and
| | - Shoaib Afzal
- Department of Clinical Biochemistry
- The Copenhagen General Population Study, and
- Faculty of Health and Medical Sciences and
| | - Børge G. Nordestgaard
- Department of Clinical Biochemistry
- The Copenhagen General Population Study, and
- Faculty of Health and Medical Sciences and
| | - Peter Lange
- The Copenhagen General Population Study, and
- Section of Respiratory Medicine, Department of Internal Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark
- Faculty of Health and Medical Sciences and
- Section of Epidemiology, Department of Public Health, University of Copenhagen, Copenhagen, Denmark; and
| | - Jørgen Vestbo
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Manchester Academic Health Science Centre, University of Manchester, and Manchester University National Health Service Foundation Trust, Manchester, United Kingdom
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The Danish comorbidity in liver transplant recipients study (DACOLT): a non-interventional prospective observational cohort study. BMC Gastroenterol 2021; 21:145. [PMID: 33794793 PMCID: PMC8017840 DOI: 10.1186/s12876-021-01733-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 03/23/2021] [Indexed: 11/10/2022] Open
Abstract
Background Liver transplantation is the only curative treatment for patients with end-stage liver disease. Short-term survival has improved due to improved surgical techniques and greater efficacy of immunosuppressive drugs. However, long-term survival has not improved to the same extent as the short-term survival, and the 10-year survival after liver transplantation is 60%. In addition to liver- and transplant-related causes, comorbidities such as cardiovascular, pulmonary, renal, and metabolic diseases have emerged as leading causes of morbidity and mortality in liver transplant recipients. The objective of this study is to assess the burden of comorbidities and identify both liver- and transplant-related risk factors as well as traditional risk factors that contribute to the pathogenesis of comorbidity in liver transplant recipients.
Methods/design The Danish Comorbidity in Liver Transplant Recipients (DACOLT) study is an observational, longitudinal study. We aim to include all adult liver transplant recipients in Denmark (n = approx. 600). Participants will be matched by sex and age to controls from the Copenhagen General Population Study (CGPS) and the Copenhagen City Heart Study (CCHS). Physical and biological measures including blood pressure, ankle–brachial index, spirometry, exhaled nitric oxide, electrocardiogram, transthoracic echocardiography, computed tomography (CT) angiography of the heart, unenhanced CT of chest and abdomen and blood samples will be collected using uniform protocols in participants in DACOLT, CGPS, and CCHS. Blood samples will be collected and stored in a research biobank. Follow-up examinations at regular intervals up to 10 years of follow-up are planned. Discussion There is no international consensus standard for optimal clinical care or monitoring of liver transplant recipients. This study will determine prevalence, incidence and risk factors for comorbidity in liver transplant recipients and may be used to provide evidence for guidelines on management, treatment and screening and thereby contribute to improvement of the long-term survival. Trial registration ClinicalTrials.gov: NCT04777032; date of registration: March 02, 2021.
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Lange P, Ahmed E, Lahmar ZM, Martinez FJ, Bourdin A. Natural history and mechanisms of COPD. Respirology 2021; 26:298-321. [PMID: 33506971 DOI: 10.1111/resp.14007] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 01/04/2021] [Indexed: 12/17/2022]
Abstract
The natural history of COPD is complex, and the disease is best understood as a syndrome resulting from numerous interacting factors throughout the life cycle with smoking being the strongest inciting feature. Unfortunately, diagnosis is often delayed with several longitudinal cohort studies shedding light on the long 'preclinical' period of COPD. It is now accepted that individuals presenting with different COPD phenotypes may experience varying natural history of their disease. This includes its inception, early stages and progression to established disease. Several scenarios regarding lung function course are possible, but it may conceptually be helpful to distinguish between individuals with normal maximally attained lung function in their early adulthood who thereafter experience faster than normal FEV1 decline, and those who may achieve a lower than normal maximally attained lung function. This may be the main mechanism behind COPD in the latter group, as the decline in FEV1 during their adult life may be normal or only slightly faster than normal. Regardless of the FEV1 trajectory, continuous smoking is strongly associated with disease progression, development of structural lung disease and poor prognosis. In developing countries, factors such as exposure to biomass and sequelae after tuberculosis may lead to a more airway-centred COPD phenotype than seen in smokers. Mechanistically, COPD is characterized by a combination of structural and inflammatory changes. It is unlikely that all patients share the same individual or combined mechanisms given the heterogeneity of resultant phenotypes. Lung explants, bronchial biopsies and other tissue studies have revealed important features. At the small airway level, progression of COPD is clinically imperceptible, and the pathological course of the disease is poorly described. Asthmatic features can further add confusion. However, the small airway epithelium is likely to represent a key focus of the disease, combining impaired subepithelial crosstalk and structural/inflammatory changes. Insufficient resolution of inflammatory processes may facilitate these changes. Pathologically, epithelial metaplasia, inversion of the goblet to ciliated cell ratio, enlargement of the submucosal glands and neutrophil and CD8-T-cell infiltration can be detected. Evidence of type 2 inflammation is gaining interest in the light of new therapeutic agents. Alarmin biology is a promising area that may permit control of inflammation and partial reversal of structural changes in COPD. Here, we review the latest work describing the development and progression of COPD with a focus on lung function trajectories, exacerbations and survival. We also review mechanisms focusing on epithelial changes associated with COPD and lack of resolution characterizing the underlying inflammatory processes.
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Affiliation(s)
- Peter Lange
- Department of Internal Medicine, Section of Respiratory Medicine, Copenhagen University Hospital - Herlev, Herlev, Denmark.,Department of Public Health, Section of Epidemiology, University of Copenhagen, Copenhagen, Denmark
| | - Engi Ahmed
- IRMB, University of Montpellier, INSERM, CHU Montpellier, Montpellier, France.,Department of Respiratory Diseases, University of Montpellier, CHU Montpellier, INSERM, Montpellier, France
| | - Zakaria Mohamed Lahmar
- Department of Respiratory Diseases, University of Montpellier, CHU Montpellier, INSERM, Montpellier, France
| | - Fernando J Martinez
- Division of Pulmonary and Critical Care Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Arnaud Bourdin
- Department of Respiratory Diseases, University of Montpellier, CHU Montpellier, INSERM, Montpellier, France.,PhyMedExp, University of Montpellier, INSERM U1046, CNRS UMR 9214, Montpellier, France
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Çolak Y, Nordestgaard BG, Vestbo J, Lange P, Afzal S. Relationship between supernormal lung function and long-term risk of hospitalisations and mortality: a population-based cohort study. Eur Respir J 2020; 57:13993003.04055-2020. [DOI: 10.1183/13993003.04055-2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 11/13/2020] [Indexed: 11/05/2022]
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12
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Landt E, Çolak Y, Lange P, Laursen LC, Nordestgaard BG, Dahl M. Chronic Cough in Individuals With COPD: A Population-Based Cohort Study. Chest 2020; 157:1446-1454. [PMID: 31987882 DOI: 10.1016/j.chest.2019.12.038] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 12/02/2019] [Accepted: 12/13/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The role and impact of chronic cough in individuals with COPD have not been described in the general population. This study hypothesized that comorbid chronic cough is a marker of disease severity in individuals with COPD. METHODS This study identified individuals with COPD and chronic cough, and recorded respiratory symptoms, health-care utilizations, lung function, and inflammatory biomarkers in blood in a nested cohort of 43,271 adults from the Copenhagen General Population Study (CGPS). RESULTS Among 43,271 individuals from the general population, 8,181 (19%) experienced COPD, of whom 796 (10%) had chronic cough. Individuals with COPD and chronic cough had a Leicester Cough Questionnaire median (25th-75th percentiles) total score of 17.7 (16.0-18.9), corresponding to 5.9 (5.3-6.3) for the physical domain, 5.6 (4.9-6.3) for the psychological domain, and 6.3 (5.8-6.8) for the social domain. Among individuals with COPD, those with chronic cough vs those without chronic cough more often experienced sputum production (60% vs 8%), wheezing (46% vs 14%), dyspnea (66% vs 38%), chest pain/tightness (9% vs 4%), nighttime dyspnea (8% vs 3%), episodes of acute bronchitis/pneumonias in the last 10 years (45% vs 25%), and ≥ 3 general practitioner visits in the past 12 months (53% vs 37%). Furthermore, these individuals had lower FEV1 % predicted (81% vs 89%) and FEV1/FVC (0.64 vs 0.66), as well as higher levels of high-sensitivity C-reactive protein, fibrinogen, leukocytes, neutrophils, eosinophils, and IgE in blood. CONCLUSIONS Comorbid chronic cough in individuals with COPD is associated with a more severe disease in terms of more respiratory symptoms and health-care utilizations, lower lung function, and increased inflammation in blood.
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Affiliation(s)
- Eskild Landt
- Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Biochemistry, Zealand University Hospital, Køge, Denmark
| | - Yunus Çolak
- Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Peter Lange
- Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Internal Medicine, Section of Respiratory Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Public Health, Section of Epidemiology, University of Copenhagen, Copenhagen, Denmark
| | - Lars Christian Laursen
- Department of Internal Medicine, Section of Respiratory Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Børge G Nordestgaard
- Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Morten Dahl
- Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Biochemistry, Zealand University Hospital, Køge, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
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Eriksson B, Backman H, Ekerljung L, Axelsson M, Lindberg A, Rönmark E, Lundbäck B. Pattern of Cardiovascular Comorbidity in COPD in a Country with Low-smoking Prevalence: Results from Two-population-based Cohorts from Sweden. COPD 2018; 15:454-463. [PMID: 30475654 DOI: 10.1080/15412555.2018.1535580] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Cardiovascular diseases are the most common comorbidities in COPD, due to common risk factors such as smoking. The prevalence of current smokers in Sweden has decreased over four decades to around 10%. The aim of the present study was to investigate the prevalence, distribution and associations of cardiovascular comorbidities in COPD by disease severity in two large areas of Sweden, both with low-smoking prevalence. Data from clinical examinations in 2009-2012, including spirometry and structured interview, from two large-scale population studies, the West Sweden Asthma Study (WSAS) and the OLIN Studies in Northern Sweden, were pooled. COPD was defined using post-bronchodilator spirometry according to the fixed ratio FEV1/FVC <0.70 and the lower limit of normal (LLN5th percentile) of the ratio of FEV1/FVC. Of the 1839 subjects included, 8.7% and 5.7% had COPD according to the fixed ratio and the LLN criterion. Medication for heart disease or hypertension among those with moderate-to-severe COPD was more common than among those without COPD (fixed ratio definition of COPD: 51% vs. 23%, p < 0.001; LLN definition: 42% vs. 24%, p = 0.002). After adjusting for known risk factors for COPD, including smoking, age, socio-economic status, and occupational exposure for gas, dust and fumes, only heart failure remained significantly, and independently, associated with COPD, irrespective of the definitions of COPD. Though a major decrease in smoking prevalence, the pattern of cardiovascular comorbidities in COPD still remains similar with previously performed studies in Sweden and in other Westernized countries as well.
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Affiliation(s)
- Berne Eriksson
- a Krefting Research Centre , Institute of Medicine, University of Gothenburg , Gothenburg , Sweden.,b Department of Internal Medicine , Central County Hospital of Halmstad , Halmstad , Sweden
| | - Helena Backman
- c Department of Public Health and Clinical Medicine, Division of Occupational and Environmental Medicine/the OLIN unit , Umeå University , Umeå , Sweden
| | - Linda Ekerljung
- a Krefting Research Centre , Institute of Medicine, University of Gothenburg , Gothenburg , Sweden
| | - Malin Axelsson
- d Department of Care Science, Faculty of Health and Society , Malmö University , Malmö , Sweden
| | - Anne Lindberg
- e Department of Public Health and Clinical Medicine, Division of Medicine/the OLIN unit , Umeå University , Umeå , Sweden
| | - Eva Rönmark
- c Department of Public Health and Clinical Medicine, Division of Occupational and Environmental Medicine/the OLIN unit , Umeå University , Umeå , Sweden
| | - Bo Lundbäck
- a Krefting Research Centre , Institute of Medicine, University of Gothenburg , Gothenburg , Sweden.,c Department of Public Health and Clinical Medicine, Division of Occupational and Environmental Medicine/the OLIN unit , Umeå University , Umeå , Sweden
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Ronit A, Kristensen T, Hoseth VS, Abou-Kassem D, Kühl JT, Benfield T, Gerstoft J, Afzal S, Nordestgaard B, Lundgren JD, Vestbo J, Kofoed K, Nielsen SD. Computed tomography quantification of emphysema in people living with HIV and uninfected controls. Eur Respir J 2018; 52:13993003.00296-2018. [DOI: 10.1183/13993003.00296-2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 05/22/2018] [Indexed: 12/14/2022]
Abstract
People living with HIV (PLWH) may be more susceptible to the development of emphysema than uninfected individuals. We assessed prevalence and risk factors for emphysema in PLWH and uninfected controls. Spirometry and chest computed tomography scans were obtained in PLWH from the Copenhagen Comorbidity in HIV Infection (COCOMO) study and in uninfected controls from the Copenhagen General Population Study (CGPS) who were >40 years. Emphysema was quantified using a low attenuation area < −950 Hounsfield units (%LAA-950) and the 15th percentile density index (PD15) and assessed by semi-quantitative visual scales. Of 742 PLWH, 21.2% and 4.7% had emphysema according to the %LAA-950 threshold with cut-offs at 5% and 10%, respectively. Of 470 uninfected controls, these numbers were 24.3% (p=0.23) and 4.0% (p=0.68). HIV was not associated with emphysema (adjusted OR 1.25, 95% CI 0.68–2.36 for %LAA-950 >10%) by PD15 or by visually assessed emphysema. We found no interaction between HIV and cumulative smoking. Breathlessness and sputum production were more common in PLWH with emphysema, and emphysema seemed to be more prevalent in PLWH with airflow limitation. HIV was therefore not independently associated with emphysema, but the clinical impact of emphysema was greater in PLWH than in uninfected controls.
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