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Øie MR, Helvik AS, Sue-Chu M, Steinsvåg SK, Thorstensen WM. Sinonasal Symptoms in COPD: Burden and Associations with Clinical Markers of Disease. Int J Chron Obstruct Pulmon Dis 2022; 17:2137-2147. [PMID: 36101792 PMCID: PMC9464443 DOI: 10.2147/copd.s372991] [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: 05/01/2022] [Accepted: 08/22/2022] [Indexed: 11/23/2022] Open
Abstract
Purpose Sinonasal symptoms are prevalent in COPD, and knowledge of the relationship between these symptoms and clinical markers of COPD is limited. This study explores the associations between the burden of sinonasal symptoms and clinical markers and thresholds recommended for guiding treatment decisions in the GOLD guidelines. Patients and Methods Sinonasal symptoms were quantified with the rhinological subscale of the Sino-Nasal-Outcome-Test (SNOT-22) in 93 COPD patients characterized by the European Position Paper on Rhinosinusitis and Nasal Polyps (EPOS) 2012 diagnostic criteria for rhinosinusitis without nasal polyps (RSsNP). Associations between a high burden, defined as a SNOT22_rhinological score of ≥11, and the following markers were assessed by adjusted multivariable linear regressions; severity of dyspnea [modified Medical Research Council (mMRC)] and cough [Visual Analogue Scale (VAS)], physical activity [6-minute walking distance (6MWD)], mortality risk (BODE index), and HRQoL [disease-specific COPD Assessment Test (CAT) and St. Georges Respiratory Questionnaire (SGRQ), and physical component summary, Short Form-36 version 2.0 (PCS SF-36v2)]. Odds ratios for the association of a high burden and threshold levels for regular treatment were estimated by adjusted binomial logistic regression models. Results A high burden was associated with greater severity of dyspnea and cough, lower 6MWD, higher BODE index and poorer HRQoL. The odds ratio of having CAT and SGRQ scores that are above the thresholds recommended for treatment was 5–7-fold greater in the high burden group. Conclusion A high burden of sinonasal symptoms is positively associated with the clinical markers of symptom severity and mortality risk and is inversely associated with physical activity and HRQoL in COPD. These findings add further support that the UAD concept also applies to COPD. Enquiry about sinonasal symptoms in COPD patients should be incorporated into the clinical routine.
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Affiliation(s)
- Marte Rystad Øie
- Department of Otolaryngology, Head and Neck Surgery, St. Olavs hospital, 7006 Trondheim University Hospital, Trondheim, Norway.,Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Anne-Sofie Helvik
- Department of Otolaryngology, Head and Neck Surgery, St. Olavs hospital, 7006 Trondheim University Hospital, Trondheim, Norway.,Department of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway
| | - Malcolm Sue-Chu
- Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.,Department of Thoracic Medicine, St. Olavs hospital, Trondheim University Hospital, Trondheim, Norway
| | - Sverre Karmhus Steinsvåg
- Department of Otolaryngology, Head and Neck Surgery, Sørlandet Hospital, Kristiansand, 4604, Norway.,Haukeland University Hospital, Bergen, Norway
| | - Wenche Moe Thorstensen
- Department of Otolaryngology, Head and Neck Surgery, St. Olavs hospital, 7006 Trondheim University Hospital, Trondheim, Norway.,Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
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Obling N, Backer V, Hurst JR, Bodtger U. Nasal and systemic inflammation in Chronic Obstructive Pulmonary Disease (COPD). Respir Med 2022; 195:106774. [DOI: 10.1016/j.rmed.2022.106774] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 02/06/2022] [Accepted: 02/13/2022] [Indexed: 11/29/2022]
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Thorstensen WM, Øie MR, Dahlslett SB, Sue-Chu M, Steinsvåg SK, Helvik AS. Olfaction in COPD. Rhinology 2021; 60:47-55. [PMID: 34647543 DOI: 10.4193/rhin21.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Olfaction is poorly characterized in COPD. To test the hypothesis that olfaction is reduced in COPD, we assessed olfaction with the "Sniffin' Sticks" test and a questionnaire addressing olfaction in COPD and a corresponding control group in respect to age and sex. We also explored whether there is an association between COPD, chronic rhinosinusitis without nasal polyps (CRSsNP), and other predefined covariates with olfactory function. METHODOLOGY Olfactory function was assessed by the score for threshold (T), discrimination (D) and identification (I), and the composite TDI score in the "Sniffin' Sticks" test and by self-reported evaluation of impaired olfaction and of "decreased sense of smell and taste" in the 22-item Sino-Nasal Outcome Test (SNOT-22) in 90 COPD patients and 93 controls. A clinical interview and ENT-examination with nasal endoscopy, skin prick test and spirometry with reversibility were performed. RESULTS The TDI, D and I scores were significantly lower in the COPD group than in the control group. The T score was not significantly different between the two groups. Hyposmia and anosmia were present in up to 79% of patients with COPD. The prevalence of self-reported impaired olfactory function and for "decreased sense of smell and taste" - was more than two-fold greater in the COPD than in the control group. COPD, higher age, male sex and allergy were associated with a lower TDI score, while CRSsNP was not associated with the TDI score. CONCLUSIONS COPD is associated with olfactory dysfunction and the underlying mechanisms for this dysfunction should be elucidated.
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Affiliation(s)
- W M Thorstensen
- Dept of Otolaryngology, Head and Neck Surgery, St. Olavs University Hospital, Trondheim, Norway.,Dept of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - M R Øie
- Dept of Otolaryngology, Head and Neck Surgery, St. Olavs University Hospital, Trondheim, Norway.,Dept of Neuromedicine and Movement Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - S B Dahlslett
- Dept of Otolaryngology, Head and Neck Surgery, St. Olavs University Hospital, Trondheim, Norway
| | - M Sue-Chu
- Dept of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.,Dept of Thoracic Medicine, St. Olavs University Hospital, Trondheim, Norway
| | - S K Steinsvåg
- Dept of Otolaryngology, Head and Neck Surgery, Sørlandet Hospital, Kristiansand, Norway.,Haukeland University Hospital, Bergen, Norway
| | - A S Helvik
- Dept of Otolaryngology, Head and Neck Surgery, St. Olavs University Hospital, Trondheim, Norway.,Dept of Public Health and Nursing, Norwegian University of Science and Technology, Trondheim, Norway
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Obling N, Backer V, Hurst JR, Bodtger U. Upper airway symptoms associate with the eosinophilic phenotype of COPD. ERJ Open Res 2021; 7:00184-2021. [PMID: 34350281 PMCID: PMC8326684 DOI: 10.1183/23120541.00184-2021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 06/08/2021] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND There is growing evidence that upper airway symptoms coexist with lower airway symptoms in COPD. Still, the prevalence and impact of upper airway disease on the nature and course of COPD remain unclear. We aimed to describe this in a cross-sectional study. METHODS We examined a cohort of COPD patients with pulmonary function tests, induced sputum, blood eosinophils, atopy tests and computed tomography (CT) of the paranasal sinuses. Lower airway symptoms were assessed using the COPD Assessment Test (CAT), and upper airway symptoms were assessed using the nasal subdomain of the 22-item Sino Nasal Outcome Test (SNOT22nasal). We recruited patients from five sites in Denmark and Sweden. We excluded patients with a history of asthma. FINDINGS In total, 180 patients (female 55%, age 67±8 years, forced expiratory volume in 1 s (FEV1 %) 52.4±16.6, Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage: A: 18%, B: 54%, C: 3%, D: 25%) were included in the study. Seventy-four patients (41%) reported high upper airway symptoms (UAS, defined as SNOT22nasal≥6) with a median score of 10 (IQR 8-13). Patients with high UAS reported higher CAT scores (17.4±7.5 versus 14.9±6.6, p<0.05) and displayed higher fractions of eosinophils in blood (median 3.0% (IQR 1.6-4.2%) versus 2.3% (IQR 1.4-3.1%), p<0.05) and in induced sputum (median 1.8% (IQR 0.3-7.1%) versus median 0.5% (IQR 0-1.7%), p<0.05). No differences in atopy, CT findings or exacerbation rates were observed. CONCLUSION COPD patients with upper airway disease showed increased evidence of eosinophilic disease and increased lower airway symptom burden.
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Affiliation(s)
- Nicolai Obling
- Dept of Respiratory Medicine, Zealand University Hospital, Næstved, Denmark
- Institute for Regional Health Research, University of Southern Denmark, Odense, Denmark
| | - Vibeke Backer
- Center for Physical Activity Research, Rigshospitalet, Copenhagen University, Copenhagen, Denmark
- Dept of ENT, Rigshospitalet, Copenhagen University, Copenhagen, Denmark
| | - John R. Hurst
- UCL Respiratory, University College London, London, UK
| | - Uffe Bodtger
- Dept of Respiratory Medicine, Zealand University Hospital, Næstved, Denmark
- Institute for Regional Health Research, University of Southern Denmark, Odense, Denmark
- Department of Internal Medicine, Zealand University Hospital, Roskilde, Denmark
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Association of Olfactory and Pulmonary Function in Middle-Aged and Older Adults: The Korea National Health and Nutrition Examination Survey. J Clin Med 2021; 10:jcm10071535. [PMID: 33917527 PMCID: PMC8038763 DOI: 10.3390/jcm10071535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/03/2021] [Accepted: 04/04/2021] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVES To identify the relationship between pulmonary function and subjective olfactory dysfunction in middle-aged and older adults. MATERIALS AND METHODS We used Korea National Health and Nutrition Examination Survey data from 2010 to 2012 to analyze 6191 participants in their 50s or older. RESULTS The frequency of olfactory dysfunction was 6.8% among the subjects with normal pulmonary function tests, but was significantly more frequent in those diagnosed with restrictive (9.6%) or obstructive (10.1%) pulmonary function. Forced volume vital capacity, forced expiratory volume (FEV)1, FEV6, and peak expiratory flow were significantly lower in the olfactory dysfunction group. The risk of olfactory dysfunction was significantly associated with obstructive pulmonary function (odds ratio (OR) [95% confidence interval (CI)]: 1.449 [1.010-2.081]) after adjusting for confounders (sex, rhinitis, chronic rhinosinusitis, hypertension, dyslipidemia, education level, stress, depressed mood, and suicidal ideation). CONCLUSION Middle-aged and older adults with obstructive pulmonary function had a higher incidence of subjective olfactory dysfunction than the normal pulmonary function group. Early olfactory testing may improve the quality of life of patients with obstructive pulmonary function.
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Chronic rhinosinusitis in COPD: A prevalent but unrecognized comorbidity impacting health related quality of life. Respir Med 2020; 171:106092. [PMID: 32846336 DOI: 10.1016/j.rmed.2020.106092] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 07/21/2020] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Unified airway disease where upper respiratory tract inflammation including chronic rhinosinusitis (CRS) affects lower airway disease is known from asthma, bronchiectasis, cystic fibrosis and primary ciliary dyskinesia but little is known about CRS and health related quality of life in COPD. We investigate firstly, the prevalence of CRS in COPD. Secondly the impact of CRS on HRQoL. Thirdly, risk factors for CRS in COPD. METHODS cross-sectional study of CRS in 222 COPD patients from 2017 to 2019 according to EPOS2012/2020 and GOLD2019 criteria. Patients completed the COPD assessment test (CAT), Medical Research Council dyspnea scale and Sinonasal outcome test 22 (SNOT22) and questions on CRS symptoms. They then had a physical examination including flexible nasal endoscopy, CT-sinus scan and HRCT-thorax. RESULTS 22.5% of COPD patients had CRS and 82% of these were undiagnosed prior to the study. HRQoL (CAT, SNOT22 and the SNOT22-nasal symptom subscore) was significantly worse in COPD patients with CRS compared with those without CRS and healthy controls. Multiple logistic regression analysis suggests that the most likely candidate for having CRS was a male COPD patient who actively smoked, took inhaled steroids, had a high CAT and SNOT22_nasal symptom subscore. DISCUSSION the largest clinical study of CRS in COPD and the only study diagnosing CRS according to EPOS and GOLD. This study supports unified airway disease in COPD. The SNOT22_nasal symptoms subscore is recommended as a standard questionnaire for COPD patients and patients at risk should be referred to an otorhinolaryngologist.
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Yii ACA, Tay T, Choo XN, Koh MSY, Tee AKH, Wang D. Precision medicine in united airways disease: A "treatable traits" approach. Allergy 2018; 73:1964-1978. [PMID: 29869791 DOI: 10.1111/all.13496] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2018] [Indexed: 12/21/2022]
Abstract
United airways disease (UAD) is the concept that the upper and lower airways, which are anatomically and immunologically related, form a single organ. According to this concept, upper and lower airway diseases are frequently comorbid because they reflect manifestations of a single underlying disease at different sites of the respiratory tract. Allergic asthma-allergic rhinitis is the archetypal UAD, but emerging data indicate that UAD is a heterogeneous condition and consists of multiple phenotypes (observable clinical characteristics) and endotypes (pathobiologic mechanisms). The UAD paradigm also extends to myriad sinonasal diseases (eg, chronic rhinosinusitis with or without nasal polyps) and lower airway diseases (eg, bronchiectasis, chronic obstructive pulmonary disease). Here, we review currently known phenoendotypes of UAD and propose a "treatable traits" approach for the classification and management of UAD, wherein pathophysiological mechanisms and factors contributing to disease are identified and targeted for treatment. Treatable traits in UAD can be analyzed according to a framework comprising airway inflammation (eosinophilic, neutrophilic), impaired airway mucosal defense (impaired mucociliary clearance, antibody deficiency), and exogenous cofactors (allergic sensitizers, tobacco smoke, microbes). Appreciation of treatable traits is necessary in advancing the effort to deliver precise treatments and achieve better outcomes in patients with UAD.
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Affiliation(s)
- A. C. A. Yii
- Department of Respiratory and Critical Care Medicine Changi General Hospital Singapore
- Duke‐National University of Singapore Medical School Singapore
| | - T.‐R. Tay
- Department of Respiratory and Critical Care Medicine Changi General Hospital Singapore
| | - X. N. Choo
- Department of Respiratory and Critical Care Medicine Changi General Hospital Singapore
| | - M. S. Y. Koh
- Department of Respiratory and Critical Care Medicine Singapore General Hospital Singapore
- Duke‐National University of Singapore Medical School Singapore
| | - A. K. H. Tee
- Department of Respiratory and Critical Care Medicine Changi General Hospital Singapore
| | - D.‐Y. Wang
- Department of Otolaryngology National University of Singapore Singapore
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Hasegawa K, Sato S, Tanimura K, Fuseya Y, Uemasu K, Hamakawa Y, Sato A, Mishima M, Muro S, Hirai T. Gastroesophageal reflux symptoms and nasal symptoms affect the severity of bronchitis symptoms in patients with chronic obstructive pulmonary disease. Respir Investig 2018; 56:230-237. [PMID: 29773294 DOI: 10.1016/j.resinv.2018.01.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 11/28/2017] [Accepted: 01/02/2018] [Indexed: 01/02/2023]
Abstract
BACKGROUND Cough and sputum production (symptoms of bronchitis) are common in chronic obstructive pulmonary disease (COPD). Extrapulmonary comorbidities, such as gastroesophageal reflux disease (GERD) and post-nasal drip, also cause bronchitis symptoms. The impact of extrapulmonary comorbidities on the severity of bronchitis symptoms in COPD is unknown. The aim of this study was to quantify bronchitis symptoms and assess the impact of GERD and nasal symptoms on the severity of bronchitis symptoms in COPD. METHODS In this cross-sectional study, stable COPD patients were recruited and completed the COPD assessment test (CAT) and Cough and Sputum Assessment Questionnaire (CASA-Q) to quantify bronchitis symptoms. To evaluate extrapulmonary comorbidities, the Frequency Scale for Symptoms of GERD (FSSG) questionnaire and nasal symptom questionnaire were completed. The impact of these comorbidities on the severity of bronchitis symptoms was analyzed. RESULTS Ninety-nine COPD patients were recruited. The presence of GERD symptoms (24.2% in the study population) was associated with more sputum symptoms. The presence of nasal discharge (43.4%) was associated with more cough and sputum symptoms, whereas post-nasal drip (13.1%) was associated with more sputum symptoms. On multivariate analyses, nasal discharge was associated with more cough symptoms. GERD and post-nasal drip were associated with more sputum symptoms. CONCLUSION This study showed that the presence of GERD and/or nasal symptoms is associated with an increase in bronchitis symptoms. Careful assessment of extrapulmonary comorbidities is necessary in the evaluation of bronchitis symptoms in COPD patients.
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Affiliation(s)
- Koichi Hasegawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Susumu Sato
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Kazuya Tanimura
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Yoshinori Fuseya
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Kiyoshi Uemasu
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Yoko Hamakawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Atsuyasu Sato
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Michiaki Mishima
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Shigeo Muro
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Toyohiro Hirai
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
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Martinez FJ, Vestbo J, Anderson JA, Brook RD, Celli BR, Cowans NJ, Crim C, Dransfield M, Kilbride S, Yates J, Newby DE, Niewoehner D, Calverley PMA. Effect of Fluticasone Furoate and Vilanterol on Exacerbations of Chronic Obstructive Pulmonary Disease in Patients with Moderate Airflow Obstruction. Am J Respir Crit Care Med 2017; 195:881-888. [DOI: 10.1164/rccm.201607-1421oc] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Fernando J. Martinez
- Division of Pulmonary and Critical Care Medicine, Weill Cornell Medicine, New York, New York
- University of Michigan Health System, Ann Arbor, Michigan
| | - Jørgen Vestbo
- Division of Infection, Immunity and Respiratory Medicine, Manchester Academic Health Sciences Centre, The University of Manchester and South Manchester, Manchester, United Kingdom
| | - Julie A. Anderson
- Research & Development, GlaxoSmithKline, Stockley Park, Middlesex, United Kingdom
| | | | - Bartolome R. Celli
- Pulmonary and Critical Care Division, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | | | - Courtney Crim
- Research & Development, GlaxoSmithKline, Research Triangle Park, North Carolina
| | | | - Sally Kilbride
- Research & Development, GlaxoSmithKline, Stockley Park, Middlesex, United Kingdom
| | - Julie Yates
- Research & Development, GlaxoSmithKline, Research Triangle Park, North Carolina
| | - David E. Newby
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, United Kingdom
| | | | - Peter M. A. Calverley
- University of Liverpool, Department of Medicine, Clinical Sciences Centre, University Hospital Aintree, Liverpool, United Kingdom
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Zhou A, Zhou Z, Zhao Y, Chen P. The recent advances of phenotypes in acute exacerbations of COPD. Int J Chron Obstruct Pulmon Dis 2017; 12:1009-1018. [PMID: 28392685 PMCID: PMC5375638 DOI: 10.2147/copd.s128604] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Exacerbations of COPD are clinically relevant events with therapeutic and prognostic implications. Yet, significant heterogeneity of clinical presentation and disease progression exists within acute exacerbations of COPD (AECOPD). Currently, different phenotypes have been widely used to describe the characteristics among patients with AECOPD. This has proved to be significant in the treatment and prediction of the outcomes of the disease. In this review of published literature, the phenotypes of AECOPD were classified according to etiology, inflammatory biomarkers, clinical manifestation, comorbidity, the frequency of exacerbations, and so on. This review concentrates on advancements in the use of phenotypes of AECOPD.
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Affiliation(s)
- Aiyuan Zhou
- Department of Respiratory Medicine, The Second Xiangya Hospital; Research Unit of Respiratory Disease; Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan, People's Republic of China
| | - Zijing Zhou
- Department of Respiratory Medicine, The Second Xiangya Hospital; Research Unit of Respiratory Disease; Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan, People's Republic of China
| | - Yiyang Zhao
- Department of Respiratory Medicine, The Second Xiangya Hospital; Research Unit of Respiratory Disease; Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan, People's Republic of China
| | - Ping Chen
- Department of Respiratory Medicine, The Second Xiangya Hospital; Research Unit of Respiratory Disease; Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan, People's Republic of China
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United Airway Diseases. Should We Add Upper Airway Inflammatory Disorders to the List of Chronic Obstructive Pulmonary Disease Comorbidities? Ann Am Thorac Soc 2015. [DOI: 10.1513/annalsats.201505-309ed] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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