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Hussein MM, Fouda EM, Shehab Y, Nabih ES, Osman AM, Ishak SR. Association between arachidonate lipoxygenase 15,c.-292 C > T gene polymorphism and non-cystic fibrosis bronchiectasis in children: a pilot study on the effects on airway lipoxin A4 and disease phenotype. Ital J Pediatr 2024; 50:90. [PMID: 38685084 PMCID: PMC11059722 DOI: 10.1186/s13052-024-01654-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 04/07/2024] [Indexed: 05/02/2024] Open
Abstract
BACKGROUND Persistent airway inflammation is a central feature of bronchiectasis. Arachidonate 15-lipoxygenase (ALOX-15) controls production of endogenous lipid mediators, including lipoxins that regulate airway inflammation. Mutations at various positions in ALOX-15 gene can influence airway disease development. We investigated association between ALOX-15,c.-292 C > T gene polymorphism and bronchiectasis unrelated to cystic fibrosis in Egyptian children. Also, lipoxin A4 (LXA4) level in bronchoalveolar lavage (BAL) was studied in relation to polymorphism genotypes and disease phenotypes determined by clinical, pulmonary functions, and radiological severity parameters. METHODS This was an exploratory study that included 60 participants. Thirty children with non-cystic fibrosis bronchiectasis (NCFB) were compared with 30 age and sex-matched controls. ALOX-15,c.-292 C > T polymorphism was genotyped using TaqMan-based Real-time PCR. LXA4 was measured in BAL using ELISA method. RESULTS There was no significant difference between patients and controls regarding ALOX-15,c.-292 C > T polymorphism genotypes and alleles (OR = 1.75; 95% CI (0.53-5.7), P = 0.35) (OR = 1; 95% CI (0.48-2), p = 1). BAL LXA4 level was significantly lower in patients, median (IQR) of 576.9 (147.6-1510) ng/ml compared to controls, median (IQR) of 1675 (536.8-2542) (p = 0.002). Patients with severe bronchiectasis had a significantly lower LXA4 level (p < 0.001). There were significant correlations with exacerbations frequency (r=-0.54, p = 0.002) and FEV1% predicted (r = 0.64, p = 0.001). Heterozygous CT genotype carriers showed higher LXA4 levels compared to other genotypes(p = 0.005). CONCLUSIONS Low airway LXA4 in children with NCFB is associated with severe disease phenotype and lung function deterioration. CT genotype of ALOX-15,c.-292 C > T polymorphism might be a protective genetic factor against bronchiectasis development and/or progression due to enhanced LXA4 production.
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Affiliation(s)
| | - Eman Mahmoud Fouda
- Pediatrics Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Yasmine Shehab
- Pediatrics Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Enas Samir Nabih
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Ahmed Mohamed Osman
- Radiology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Sally Raafat Ishak
- Pediatrics Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
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Goolam Mahomed A, Maasdorp SD, Barnes R, van Aswegen H, Lupton-Smith A, Allwood B, Calligaro G, Feldman C, Kalla IS. South African Thoracic Society position statement on the management of non-cystic fibrosis bronchiectasis in adults: 2023. Afr J Thorac Crit Care Med 2023; 29:10.7196/AJTCCM.2023.v29i2.647. [PMID: 37638142 PMCID: PMC10450449 DOI: 10.7196/ajtccm.2023.v29i2.647] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 05/10/2023] [Indexed: 08/29/2023] Open
Abstract
Background Bronchiectasis is a chronic lung disorder that affects the lives of many South Africans. Post-tuberculosis (TB) bronchiectasis is an important complication of previous pulmonary TB and a common cause of bronchiectasis in South Africa (SA). No previous statements on the management of bronchiectasis in SA have been published. Objectives To provide a position statement that will act as a template for the management of adult patients with bronchiectasis in SA. Methods The South African Thoracic Society appointed an editorial committee to compile a position statement on the management of adult non-cystic fibrosis (CF) bronchiectasis in SA. Results A position statement addressing the management of non-CF bronchiectasis in adults in SA was compiled. This position statement covers the epidemiology, aetiology, diagnosis, investigations and various aspects of management of adult patients with non-CF bronchiectasis in SA. Conclusion Bronchiectasis has largely been a neglected lung condition, but new research has improved the outlook for patients. Collaboration between interprofessional team members in patient management is important. In SA, more research into the epidemiology of bronchiectasis, especially post-TB bronchiectasis and HIV-associated bronchiectasis, is required. Abstract The South African Thoracic Society mandated a multidisciplinary team of healthcare providers to compile a position statement on the management of non-cystic fibrosis bronchiectasis in South Africa (SA). International guidelines on the management of bronchiectasis were reviewed and used as a basis from which the current position statement was compiled. This is the first position statement on the management of adult non-cystic fibrosis bronchiectasis in SA. A description of the epidemiology and aetiology of bronchiectasis is provided, as well as guidance on its diagnosis and management. The position statement provides guidance on the management of bronchiectasis to healthcare providers, policymakers and regulatory authorities.
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Affiliation(s)
| | - S D Maasdorp
- Division of Pulmonology and Critical Care, Department of Internal Medicine, Faculty of Health Sciences, University of the Free State, Bloemfontein,
South Africa
| | - R Barnes
- Department of Physiotherapy, Faculty of Health Sciences, University of the Free State, Bloemfontein, South Africa
| | - H van Aswegen
- Department of Physiotherapy, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - A Lupton-Smith
- Division of Physiotherapy, Department of Health and Rehabilitation Sciences, Stellenbosch University, Cape Town, South Africa
| | - B Allwood
- Division of Pulmonology, Department of Internal Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - G Calligaro
- Division of Pulmonology, Department of Internal Medicine, Faculty of Health Sciences, University of Cape Town, South Africa
| | - C Feldman
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - I S Kalla
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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Elhussini MSH, Mohammed AM, Eid HA, Gharib A. Bronchiectasis as co morbidity with COPD or ILD: complex interactions and severe consequences. THE EGYPTIAN JOURNAL OF BRONCHOLOGY 2023. [DOI: 10.1186/s43168-023-00192-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023] Open
Abstract
Abstract
Background
Bronchiectasis is a chronic pulmonary disease characterized by widened, malformed bronchi, with profuse expectoration and impaired quality of life. COPD and ILD are common co-morbidities with bronchiectasis.
Methods
The present study evaluated the clinical, laboratory& radiological characteristics of COPD and ILD with/without bronchiectasis. A hospital-based, retrospective study was conducted for 1 year.
Results
A total of 101 patients were analyzed, 60 patients had COPD, 34 had ILD and 7 patients had bronchiectasis without COPD or ILD. It was noticed that, out of the analyzed 60 COPD patients, 10 patients developed bronchiectasis (16.7%) versus10 patients of 34 ILD patients (29.4%). In COPD and ILD accompanied by bronchiectasis, the incidence of hemoptysis was significantly higher in comparison to those without bronchiectasis. Moreover, they showed a significant increase in partial pressure of carbon dioxide (PCO2) in comparison to those without bronchiectasis, as well as in comparison to bronchiectasis only. Sputum culture revealed that COPD with bronchiectasis were significantly associated with Staphlococcus aureus (77.8%), more than ILD with Bronchiectasis (33.3%). While S. pneumoniae were more evident in cases of ILD with bronchiectasis (22.2%). The bilateral, peripheral bronchiectasis was more common than the unilateral, central bronchiectasis among cases of COPD with bronchiectasis followed by ILD with bronchiectasis more than bronchiectasis only.
Conclusion
Patients with COPD /ILD with bronchiectasis can be associated with serious clinical manifestations as hemoptysis. Their sputum cultures detected more positive organisms than negative in comparison to cases of bronchiectasis only. Screening of COPD and ILD patients using HRCT Scanning is a recommended preventive measure for early detection of bronchiectasis.
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Schwartz BS, Al-Sayouri SA, Pollak JS, Hirsch AG, Kern R, Tan B, Kato A, Schleimer RP, Peters AT. Strong and consistent associations of precedent chronic rhinosinusitis with risk of non-cystic fibrosis bronchiectasis. J Allergy Clin Immunol 2022; 150:701-708.e4. [PMID: 35314187 PMCID: PMC9463084 DOI: 10.1016/j.jaci.2022.03.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 01/20/2022] [Accepted: 03/03/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Chronic rhinosinusitis (CRS) and bronchiectasis commonly co-occur, but most prior studies were not designed to evaluate temporality and causality. OBJECTIVES In a sample representing the general population in 37 counties in Pennsylvania, and thus the full spectrum of sinonasal and relevant lung diseases, we aimed to evaluate the temporality and strength of associations of CRS with non-cystic fibrosis bronchiectasis. METHODS We completed case-control analyses for each of 3 primary bronchiectasis case finding methods. We used electronic health records to identify CRS and bronchiectasis with diagnoses, procedure orders, and/or specific text in sinus or chest computerized tomography scan radiology reports. The controls never had any indication of bronchiectasis and were frequency-matched to the 3 bronchiectasis groups on the basis of age, sex, and encounter year. There were 5,329 unique persons with bronchiectasis and 33,363 without bronchiectasis in the 3 analyses. Important co-occurring conditions were identified with diagnoses, medication orders, and encounter types. Logistic regression was used to evaluate associations (odds ratios [ORs] and 95% CIs) of CRS with bronchiectasis while adjusting for confounding variables. RESULTS In adjusted analyses, CRS was consistently and strongly associated with all 3 bronchiectasis definitions. The strongest associations for CRS (ORs and 95% CIs) were those that were based on the text of sinus computerized tomography scan reports; the associations were generally stronger for CRS without nasal polyps (eg, OR = 4.46 [95% CI = 2.09-9.51] for diagnosis-based bronchiectasis). On average, CRS was identified more than 6 years before bronchiectasis. CONCLUSION Precedent CRS was strongly and consistently associated with increased risk of bronchiectasis.
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Affiliation(s)
- Brian S Schwartz
- Department of Environmental Health and Engineering, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Md; Department of Population Health Sciences, Geisinger, Danville, Pa.
| | - Saba A Al-Sayouri
- Department of Environmental Health and Engineering, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Md
| | - Jonathan S Pollak
- Department of Environmental Health and Engineering, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Md
| | - Annemarie G Hirsch
- Department of Environmental Health and Engineering, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Md; Department of Population Health Sciences, Geisinger, Danville, Pa
| | - Robert Kern
- Department of Otolaryngology Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Bruce Tan
- Department of Otolaryngology Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Atsushi Kato
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Robert P Schleimer
- Department of Otolaryngology Head and Neck Surgery, Northwestern University Feinberg School of Medicine, Chicago, Ill; Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Anju T Peters
- Division of Allergy and Immunology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Ill
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Somayaji R, Chalmers JD. Just breathe: a review of sex and gender in chronic lung disease. Eur Respir Rev 2022; 31:31/163/210111. [PMID: 35022256 DOI: 10.1183/16000617.0111-2021] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Accepted: 08/20/2021] [Indexed: 01/08/2023] Open
Abstract
Chronic lung diseases are the third leading cause of death worldwide and are increasing in prevalence over time. Although much of our traditional understanding of health and disease is derived from study of the male of the species - be it animal or human - there is increasing evidence that sex and gender contribute to differences in disease risk, prevalence, presentation, severity, treatment approach, response and outcomes. Chronic obstructive pulmonary disease, asthma and bronchiectasis represent the most prevalent and studied chronic lung diseases and have key sex- and gender-based differences which are critical to consider and incorporate into clinical and research approaches. Mechanistic differences present opportunities for therapeutic development whereas behavioural and clinical differences on the part of patients and providers present opportunities for greater education and understanding at multiple levels. In this review, we seek to summarise the sex- and gender-based differences in key chronic lung diseases and outline the clinical and research implications for stakeholders.
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Affiliation(s)
- Ranjani Somayaji
- Dept of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Canada .,Dept of Microbiology, Immunology and Infectious Disease, University of Calgary, Calgary, Canada.,Dept of Community Health Sciences, University of Calgary, Calgary, Canada
| | - James D Chalmers
- Division of Molecular and Clinical Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, UK
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Lee YQ, Selvakumar A, See KC. Treatable Traits in Chronic Respiratory Disease: A Comprehensive Review. Cells 2021; 10:3263. [PMID: 34831485 PMCID: PMC8624727 DOI: 10.3390/cells10113263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 11/07/2021] [Accepted: 11/20/2021] [Indexed: 12/05/2022] Open
Abstract
Chronic respiratory diseases are major contributors to the global burden of disease. While understanding of these diseases has improved, treatment guidelines have continued to rely on severity and exacerbation-based approaches. A new personalised approach, termed the "treatable traits" approach, has been suggested to address the limitations of the existing treatment strategies. We aim to systematically review the current evidence regarding treatable traits in chronic respiratory diseases and to identify gaps in the current literature. We searched the PubMed and Embase databases and included studies on treatable traits and chronic respiratory diseases. We then extracted information on prevalence, prognostic implications, treatment options and benefits from these studies. A total of 58 papers was included for review. The traits identified were grouped into five broad themes: physiological, biochemical, psychosocial, microbiological, and comorbidity traits. Studies have shown advantages of the treatable traits paradigm in the clinical setting. However, few randomised controlled trials have been conducted. Findings from our review suggest that multidisciplinary management with therapies targeted at treatable traits has the potential to be efficacious when added to the best practices currently implemented. This paradigm has the potential to improve the holistic care of chronic respiratory diseases.
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Affiliation(s)
- Yong Qin Lee
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore; (Y.Q.L.); (K.C.S.)
| | - Asvin Selvakumar
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore; (Y.Q.L.); (K.C.S.)
| | - Kay Choong See
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore; (Y.Q.L.); (K.C.S.)
- Division of Respiratory & Critical Care Medicine, Department of Medicine, National University Hospital, Singapore 119228, Singapore
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Livnat G, Yaari N, Stein N, Bentur L, Hanna M, Harel M, Adir Y, Shteinberg M. 4-week daily airway clearance using oscillating positive-end expiratory pressure versus autogenic drainage in bronchiectasis patients: a randomised controlled trial. ERJ Open Res 2021; 7:00426-2021. [PMID: 34760994 PMCID: PMC8573225 DOI: 10.1183/23120541.00426-2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Accepted: 08/25/2021] [Indexed: 12/03/2022] Open
Abstract
Background Airway clearance is a fundamental component of bronchiectasis care. Lung clearance index (LCI) is a measurement of ventilation inhomogeneity. Its responsiveness to long-term airway clearance is unknown. We aimed to compare two methods of daily airway clearance over 4 weeks: autogenic drainage (AD) and oscillating positive airway pressure (oPEP), and to determine effects of airway clearance on LCI and clinical outcomes. Methods Adults with bronchiectasis naive to airway clearance were randomised to daily airway clearance with either AD or oPEP. Difference in LCI as primary outcome, spirometry, sputum volume and purulence, and quality of life were at randomisation and after 4 weeks of airway clearance. Results 51 patients (32 women and 19 men, mean age 66.2±12.8 years) were randomised and 49 completed the study (25 AD and 24 oPEP). The LCI and forced expiratory volume in 1 s did not change between visits between groups (difference between groups 0.02), nor between visits in either group. Sputum quantity decreased in 12 out of 24 (50%) of the oPEP group, and in six out of 25 (24%) of the AD group (p=0.044). The “treatment burden” worsened or was unchanged in 70% of participants randomised to AD and 55% randomised to oPEP (p=0.038). Conclusion Sputum quantity decreased in more participants randomised to oPEP group after 1 month of daily airway clearance, with a better treatment burden. The effects of 4 weeks of airway clearance on LCI were not significant in either treatment group. People with bronchiectasis were randomised to 4 weeks of two methods of daily airway clearance, autogenic drainage (AD) and oscillating PEP (oPEP). Sputum volume decreased in more people randomised to oPEP than AD. LCI did not change in either group.https://bit.ly/3gNj2bi
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Affiliation(s)
- Galit Livnat
- Pediatric Pulmonology, Carmel Medical Center, Haifa, Israel.,Cystic Fibrosis Center, Carmel Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Naama Yaari
- Dept of Physical Therapy, Carmel Medical Center, Haifa, Israel
| | - Nili Stein
- Dept of Community Medicine and Epidemiology, Carmel Medical Center, Haifa, Israel
| | - Lea Bentur
- Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.,Pediatric Pulmonology and CF Center, The Ruth Rappaport Children's Hospital, Rambam Medical Center, Haifa, Israel
| | - Moneera Hanna
- Pediatric Pulmonology and CF Center, The Ruth Rappaport Children's Hospital, Rambam Medical Center, Haifa, Israel
| | - Maya Harel
- Pulmonology Institute, Carmel Medical Center, Haifa, Israel
| | - Yochai Adir
- Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.,Pulmonology Institute, Carmel Medical Center, Haifa, Israel
| | - Michal Shteinberg
- Cystic Fibrosis Center, Carmel Medical Center, Haifa, Israel.,Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.,Pulmonology Institute, Carmel Medical Center, Haifa, Israel
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Lipardi C, Elliott CG, Sugarmann CL, Haskell L, Spyropoulos AC, Raskob GE, Xu J, Lu W, Marsigliano J, Spiro T, Yuan Z, Wu S, Barnathan ES. Risk of Severe Bleeding With Extended Rivaroxaban to Prevent Venous Thromboembolism in Acute Medically Ill Patients With Bronchiectasis. Clin Appl Thromb Hemost 2021; 27:10760296211053316. [PMID: 34719984 PMCID: PMC8559236 DOI: 10.1177/10760296211053316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background: Bronchiectasis is a chronic inflammation of the bronchi with recurrent infections and hemoptysis. The MAGELLAN study compared oral rivaroxaban, 10 mg once daily (QD), for 35 ± 4 days with subcutaneous enoxaparin 40 mg QD for 10 ± 4 days followed by placebo for 25 ± 4 days to prevent venous thromboembolism in patients hospitalized with an acute medical illness. MAGELLAN included a subset of patients with bronchiectasis. In a post hoc analysis, we evaluated the incidence and severity of pulmonary bleeding in patients with bronchiectasis who were hospitalized for an acute medical illness. This analysis included MAGELLAN patients diagnosed with bronchiectasis at baseline. Patients were evaluated by treatment group for International Society on Thrombosis and Haemostasis major bleeding, non-major clinically relevant (NMCR) bleeding, and the composite of the 2 (ie, clinically relevant bleeding). Results: Medically ill patients with bronchiectasis were randomized to rivaroxaban (n = 60) or enoxaparin/placebo (n = 61). There were 2 fatal pulmonary bleeds and 1 fatal gastrointestinal bleed in the rivaroxaban arm and no fatal or major bleeding in the enoxaparin/placebo arm. The incidence of major bleeding was 5% in the rivaroxaban arm. One NMCR bleed occurred in the rivaroxaban arm and 2 NMCR bleeds occurred in the enoxaparin/placebo arm. The incidence of clinically relevant bleeding was 6.7% versus 3.3% in the rivaroxaban and enoxaparin/placebo groups, respectively (relative risk = 2.06 [95% confidence interval: 0.351-12.046]). Conclusion: In-patients hospitalized with bronchiectasis and an acute medical illness, clinically relevant bleeding, including fatal pulmonary hemorrhage, occurs more frequently with extended rivaroxaban thromboprophylaxis than with enoxaparin followed by placebo.
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Affiliation(s)
| | | | | | - Lloyd Haskell
- 6808Janssen Research and Development, LLC, Raritan, NJ, USA
| | - Alex C Spyropoulos
- 232890The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, NY, USA.,Anticoagulation and Clinical Thrombosis Services, Northwell Health at Lenox Hill Hospital, New York, NY, USA.,68477I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Gary E Raskob
- Hudson College of Public Health, 51166University of Oklahoma Health Sciences Center, OK, USA
| | - Jianfeng Xu
- 6808Janssen Research and Development, LLC, Raritan, NJ, USA
| | - Wentao Lu
- 6808Janssen Research and Development, LLC, Raritan, NJ, USA
| | | | | | - Zhong Yuan
- 6808Janssen Research and Development, LLC, Titusville, NJ, USA
| | - Shujian Wu
- 6808Janssen Research and Development, LLC, Horsham, PA, USA
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