Sputum Microbiota and the Association With Clinical Parameters in Steady-state, Acute Exacerbation and Convalescence of Bronchiectasis
NCT ID: NCT02315547
Last Updated: 2019-08-01
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.
UNKNOWN
NA
120 participants
INTERVENTIONAL
2015-01-31
2023-12-31
Brief Summary
Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.
In study 2, patients inform investigators upon symptom deterioration. Following diagnosis of BEs, patients will undergo the aforementioned assessments as soon as possible. This entails antibiotic treatment, with slightly modified protocol, based on British Thoracic Society guidelines \[16\]. At 1 week after completion of 14-day antibiotic therapy, patients will undergo convalescence visit.
Study 3 is a prospective 1-year follow-up scheme in which patients participated in telephone or hospital visits every 3 months. For individual visit, spirometry and sputum culture will be performed, and BEs will be meticulously captured from clinical charts and history inquiry, with the final decisions adjudicated following group discussion.
Related Clinical Trials
Explore similar clinical trials based on study characteristics and research focus.
Bacteriology and Inflammation in Bronchiectasis
NCT01761214
Observational Study of Sputum Inflammation Phenotypes and Clinical Outcomes in Non-Cystic Fibrosis Bronchiectasis
NCT06715956
Identification of Microbiome and Metabolome of Bronchiectasis in Chinese Population.
NCT04490447
The Role of Airway Microbiota on Clinical Phenotypes and Disease Severity in Bronchiectasis
NCT05068518
Occurrence of Potential Bacterial and Viral Pathogens in Stable Chronic Obstructive Pulmonary Disease and During Acute Exacerbations of the Disease, in Asia Pacific
NCT03151395
Detailed Description
Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.
However, it should be recognized that routine sputum bacterial culture techniques could only effectively identify a small proportion of PPMs. The assay sensitivity and specificity could be significantly affected by the duration from sampling to culture, the culture media and environment. Pyrosequencing of the bacterial 16srRNA might offer more comprehensive assessment of the airway microbiota. Based on this technique, Goleva and associates \[11\] identified an abundance of gram-negative microbiota (predominantly the phylum proteobacteria) which might be responsible for corticosteroid insensitivity. The microbiome of airways in patients with asthma \[11,12\], idiopathic pulmonary fibrosis \[13\] and bronchiectasis \[14,15\] has also been characterized. Furthermore, the association between the "core microbiota" and clinical parameters (i.e., FEV1) has been demonstrated. However, previous studies suffered from relatively small sample size and lack of comprehensive sets of clinical parameters for further analyses.
Bronchiectasis exacerbations (BEs) are characterized by significantly worsened symptoms and (or) signs that warrant antibiotics therapy. The precise mechanisms responsible for triggering BEs have not been fully elucidated, but could be related to virus infection and increased bacterial virulence. However, it should be recognized that antibiotics, despite extensive bacterial resistance, remain effective for most BEs. This at least partially suggested that bacterial infection might have played a major role in the pathogenesis of BEs. Therefore, the assessment of sputum microbiota during steady-state, BEs and convalescence may unravel more insights into the dynamic variation in microbiota compositions and the principal microbiota phylum or species that account for BEs.
In the this study, the investigators seek to perform 16srRNA pyrosequencing to determine: 1) the differences in microbiota compositions between bronchiectasis patients and healthy subjects; 2) association between sputum microbiota compositions and clinical parameters, including systemic/airway inflammation, spirometry, disease severity, airway oxidative stress biomarkers and matrix metalloproteinase; 3) the microbiota compositions in patients who yielded "normal flora (commensals)", in particular those who produced massive sputum daily (\>50ml/d); 4) dynamic changes in microbiota compositions during BEs and convalescence as compared with baseline levels; 5) the utility of predominant microbiota taxa in predicting lung function decline and future risks of BEs during 1-year follow-up.
Conditions
See the medical conditions and disease areas that this research is targeting or investigating.
Study Design
Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.
NA
SINGLE_GROUP
DIAGNOSTIC
NONE
Study Groups
Review each arm or cohort in the study, along with the interventions and objectives associated with them.
Antibiotics
Patients will be given antibiotics based on sputum microbiology during steady-state bronchiectasis. The methodology has been described in the British Thoracic Society guideline \[16\]. Briefly, for first-line therapy, patients isolated with Hemophilus influenzae, Hemophilus parainfluenzae, Streptoccus pneumoniae and Moraxella catarrhalis at baseline will be treated with amoxicillin clavulanate potassium (625mg bid); patients isolated with Klebsela pneumonae or Pseudomonas aeruginosa at baseline will be treated with fluoroquinolones. Levofloxacin (500mg qd) will be empirically employed for antibiotic treatment in those who tested negative to sputum microbiology. Severe BEs could be prescribed with intravenous antibiotics therapy at the discretion of study investigators, either in the out-patient department or hospitalized for intensive systemic treatment. Hospitalized patients will not be included in the exacerbation cohort.
Antibiotics
Patients will be given antibiotics based on sputum microbiology during steady-state bronchiectasis. The methodology has been described in the British Thoracic Society guideline \[16\]. Briefly, for first-line therapy, patients isolated with Hemophilus influenzae, Hemophilus parainfluenzae, Streptoccus pneumoniae and Moraxella catarrhalis at baseline will be treated with amoxicillin clavulanate potassium (625mg bid); patients isolated with Klebsela pneumonae or Pseudomonas aeruginosa at baseline will be treated with fluoroquinolones. Levofloxacin (500mg qd) will be empirically employed for antibiotic treatment in those who tested negative to sputum microbiology. Severe BEs could be prescribed with intravenous antibiotics therapy at the discretion of study investigators, either in the out-patient department or hospitalized for intensive systemic treatment. Hospitalized patients will not be included in the exacerbation cohort.
Interventions
Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.
Antibiotics
Patients will be given antibiotics based on sputum microbiology during steady-state bronchiectasis. The methodology has been described in the British Thoracic Society guideline \[16\]. Briefly, for first-line therapy, patients isolated with Hemophilus influenzae, Hemophilus parainfluenzae, Streptoccus pneumoniae and Moraxella catarrhalis at baseline will be treated with amoxicillin clavulanate potassium (625mg bid); patients isolated with Klebsela pneumonae or Pseudomonas aeruginosa at baseline will be treated with fluoroquinolones. Levofloxacin (500mg qd) will be empirically employed for antibiotic treatment in those who tested negative to sputum microbiology. Severe BEs could be prescribed with intravenous antibiotics therapy at the discretion of study investigators, either in the out-patient department or hospitalized for intensive systemic treatment. Hospitalized patients will not be included in the exacerbation cohort.
Eligibility Criteria
Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.
Inclusion Criteria
It is estimated that 120 patients will be recruited in the study. Some of the patients in the BISER study (currently still ongoing, No.: NCT01761214) who are eligible for the current study will undergo assessments de novo, with the index date deemed as the the date of recruitment
Exclusion Criteria
2. Female patient who is lactating or pregnant
3. Patients having concomitant severe systemic illnesses (i.e. coronary heart disease, cerebral stroke, uncontrolled hypertension, active gastric ulcer, malignant tumor, hepatic dysfunction, renal dysfunction)
4. Miscellaneous conditions that would potentially influence efficacy assessment, as judged by the investigators
5. Participation in another clinical trial within the preceding 3 months
18 Years
85 Years
ALL
Yes
Sponsors
Meet the organizations funding or collaborating on the study and learn about their roles.
Guangzhou Institute of Respiratory Disease
OTHER
Responsible Party
Identify the individual or organization who holds primary responsibility for the study information submitted to regulators.
Weijie Guan
physician
Principal Investigators
Learn about the lead researchers overseeing the trial and their institutional affiliations.
Nan-shan Zhong, MD
Role: STUDY_CHAIR
State Key Laboraotry of Respiratory Disease
Locations
Explore where the study is taking place and check the recruitment status at each participating site.
Guangzhou Institute of Respiratory Disease
Guangzhou, Guangdong, China
Countries
Review the countries where the study has at least one active or historical site.
Central Contacts
Reach out to these primary contacts for questions about participation or study logistics.
Facility Contacts
Find local site contact details for specific facilities participating in the trial.
References
Explore related publications, articles, or registry entries linked to this study.
Pasteur MC, Helliwell SM, Houghton SJ, Webb SC, Foweraker JE, Coulden RA, Flower CD, Bilton D, Keogan MT. An investigation into causative factors in patients with bronchiectasis. Am J Respir Crit Care Med. 2000 Oct;162(4 Pt 1):1277-84. doi: 10.1164/ajrccm.162.4.9906120.
Davies G, Wells AU, Doffman S, Watanabe S, Wilson R. The effect of Pseudomonas aeruginosa on pulmonary function in patients with bronchiectasis. Eur Respir J. 2006 Nov;28(5):974-9. doi: 10.1183/09031936.06.00074605. Epub 2006 Aug 9.
Chmiel JF, Davis PB. State of the art: why do the lungs of patients with cystic fibrosis become infected and why can't they clear the infection? Respir Res. 2003;4(1):8. doi: 10.1186/1465-9921-4-8. Epub 2003 Aug 27.
King PT, Hutchinson PE, Johnson PD, Holmes PW, Freezer NJ, Holdsworth SR. Adaptive immunity to nontypeable Haemophilus influenzae. Am J Respir Crit Care Med. 2003 Feb 15;167(4):587-92. doi: 10.1164/rccm.200207-728OC. Epub 2002 Nov 14.
Sadikot RT, Blackwell TS, Christman JW, Prince AS. Pathogen-host interactions in Pseudomonas aeruginosa pneumonia. Am J Respir Crit Care Med. 2005 Jun 1;171(11):1209-23. doi: 10.1164/rccm.200408-1044SO. Epub 2005 Feb 1.
Starner TD, Zhang N, Kim G, Apicella MA, McCray PB Jr. Haemophilus influenzae forms biofilms on airway epithelia: implications in cystic fibrosis. Am J Respir Crit Care Med. 2006 Jul 15;174(2):213-20. doi: 10.1164/rccm.200509-1459OC. Epub 2006 May 4.
Horvath I, Loukides S, Wodehouse T, Kharitonov SA, Cole PJ, Barnes PJ. Increased levels of exhaled carbon monoxide in bronchiectasis: a new marker of oxidative stress. Thorax. 1998 Oct;53(10):867-70. doi: 10.1136/thx.53.10.867.
Angrill J, Agusti C, De Celis R, Filella X, Rano A, Elena M, De La Bellacasa JP, Xaubet A, Torres A. Bronchial inflammation and colonization in patients with clinically stable bronchiectasis. Am J Respir Crit Care Med. 2001 Nov 1;164(9):1628-32. doi: 10.1164/ajrccm.164.9.2105083.
Ryall B, Davies JC, Wilson R, Shoemark A, Williams HD. Pseudomonas aeruginosa, cyanide accumulation and lung function in CF and non-CF bronchiectasis patients. Eur Respir J. 2008 Sep;32(3):740-7. doi: 10.1183/09031936.00159607. Epub 2008 May 14.
Evans SA, Turner SM, Bosch BJ, Hardy CC, Woodhead MA. Lung function in bronchiectasis: the influence of Pseudomonas aeruginosa. Eur Respir J. 1996 Aug;9(8):1601-4. doi: 10.1183/09031936.96.09081601.
Goleva E, Jackson LP, Harris JK, Robertson CE, Sutherland ER, Hall CF, Good JT Jr, Gelfand EW, Martin RJ, Leung DY. The effects of airway microbiome on corticosteroid responsiveness in asthma. Am J Respir Crit Care Med. 2013 Nov 15;188(10):1193-201. doi: 10.1164/rccm.201304-0775OC.
Marri PR, Stern DA, Wright AL, Billheimer D, Martinez FD. Asthma-associated differences in microbial composition of induced sputum. J Allergy Clin Immunol. 2013 Feb;131(2):346-52.e1-3. doi: 10.1016/j.jaci.2012.11.013. Epub 2012 Dec 23.
Garzoni C, Brugger SD, Qi W, Wasmer S, Cusini A, Dumont P, Gorgievski-Hrisoho M, Muhlemann K, von Garnier C, Hilty M. Microbial communities in the respiratory tract of patients with interstitial lung disease. Thorax. 2013 Dec;68(12):1150-6. doi: 10.1136/thoraxjnl-2012-202917. Epub 2013 Aug 14.
Rogers GB, van der Gast CJ, Cuthbertson L, Thomson SK, Bruce KD, Martin ML, Serisier DJ. Clinical measures of disease in adult non-CF bronchiectasis correlate with airway microbiota composition. Thorax. 2013 Aug;68(8):731-7. doi: 10.1136/thoraxjnl-2012-203105. Epub 2013 Apr 6.
Tunney MM, Einarsson GG, Wei L, Drain M, Klem ER, Cardwell C, Ennis M, Boucher RC, Wolfgang MC, Elborn JS. Lung microbiota and bacterial abundance in patients with bronchiectasis when clinically stable and during exacerbation. Am J Respir Crit Care Med. 2013 May 15;187(10):1118-26. doi: 10.1164/rccm.201210-1937OC.
Pasteur MC, Bilton D, Hill AT; British Thoracic Society Bronchiectasis non-CF Guideline Group. British Thoracic Society guideline for non-CF bronchiectasis. Thorax. 2010 Jul;65 Suppl 1:i1-58. doi: 10.1136/thx.2010.136119.
Chalmers JD, Goeminne P, Aliberti S, McDonnell MJ, Lonni S, Davidson J, Poppelwell L, Salih W, Pesci A, Dupont LJ, Fardon TC, De Soyza A, Hill AT. The bronchiectasis severity index. An international derivation and validation study. Am J Respir Crit Care Med. 2014 Mar 1;189(5):576-85. doi: 10.1164/rccm.201309-1575OC.
Laszlo G. Standardisation of lung function testing: helpful guidance from the ATS/ERS Task Force. Thorax. 2006 Sep;61(9):744-6. doi: 10.1136/thx.2006.061648.
Zheng J, Zhong N. Normative values of pulmonary function testing in Chinese adults. Chin Med J (Engl). 2002 Jan;115(1):50-4.
Fodor AA, Klem ER, Gilpin DF, Elborn JS, Boucher RC, Tunney MM, Wolfgang MC. The adult cystic fibrosis airway microbiota is stable over time and infection type, and highly resilient to antibiotic treatment of exacerbations. PLoS One. 2012;7(9):e45001. doi: 10.1371/journal.pone.0045001. Epub 2012 Sep 26.
Other Identifiers
Review additional registry numbers or institutional identifiers associated with this trial.
GIRD-20141208-GWJ
Identifier Type: -
Identifier Source: org_study_id
More Related Trials
Additional clinical trials that may be relevant based on similarity analysis.