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- PMID: 22513083
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Article: Bacteria in sputum of stable severe asthma and increased airway wall thickness
Title | Bacteria in sputum of stable severe asthma and increased airway wall thickness |
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Authors | |
Keywords | Airway wall thickness Severe asthma Sputum bacteria |
Issue Date | 2012 |
Publisher | BioMed Central Ltd. The Journal's web site is located at http://respiratory-research.com/ |
Citation | Respiratory Research, 2012, v. 13 n. 1, p. Article no. 35 How to Cite? |
Abstract | BACKGROUND: Patients with chronic asthma have thicker intrapulmonary airways measured on high resolution computed tomography (HRCT). We determined whether the presence of lower airway bacteria was associated with increased airway wall thickness. METHODS: In 56 patients with stable severe asthma, sputum specimens obtained either spontaneously or after induction with hypertonic saline were cultured for bacteria and thoracic HRCT scans obtained. Wall thickness (WT) and area (WA) expressed as a ratio of airway diameter (D) and total area, respectively, were measured at five levels. RESULTS: Positive bacterial cultures were obtained in 29 patients, with H. influenzae, P. aeruginosa and S. aureus being the commonest strains. Logistic regression analysis showed that this was associated with the duration of asthma and the exacerbations during the past year. In airways > 2 mm, there was no significant difference in WA (67.5 +/- 5.4 vs 66.4 +/- 5.4) and WT/D (21.6 +/- 2.7 vs 21.3 +/- 2.4) between the culture negative versus positive groups. Similarly, in airways (= 2 mm), there were no significant differences in these parameters. The ratio of radicalwall area to Pi was negatively correlated with FEV1% predicted (p < 0.05). CONCLUSIONS: Bacterial colonization of the lower airways is common in patients with chronic severe asthma and is linked to the duration of asthma and having had exacerbations in the past year, but not with an increase in airway wall thickness. |
Persistent Identifier | http://hdl.handle.net/10722/192088 |
ISSN | 2010 Impact Factor: 2.859 2023 SCImago Journal Rankings: 1.498 |
PubMed Central ID | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhang, Q | - |
dc.contributor.author | Illing, R | - |
dc.contributor.author | Hui, CK | - |
dc.contributor.author | Downey, K | - |
dc.contributor.author | Carr, D | - |
dc.contributor.author | Stearn, M | - |
dc.contributor.author | Alshafi, K | - |
dc.contributor.author | Menzies-Gow, A | - |
dc.contributor.author | Zhong, N | - |
dc.contributor.author | Chung, KF | - |
dc.date.accessioned | 2013-10-18T08:50:00Z | - |
dc.date.available | 2013-10-18T08:50:00Z | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | Respiratory Research, 2012, v. 13 n. 1, p. Article no. 35 | - |
dc.identifier.issn | 1465-9921 | - |
dc.identifier.uri | http://hdl.handle.net/10722/192088 | - |
dc.description.abstract | BACKGROUND: Patients with chronic asthma have thicker intrapulmonary airways measured on high resolution computed tomography (HRCT). We determined whether the presence of lower airway bacteria was associated with increased airway wall thickness. METHODS: In 56 patients with stable severe asthma, sputum specimens obtained either spontaneously or after induction with hypertonic saline were cultured for bacteria and thoracic HRCT scans obtained. Wall thickness (WT) and area (WA) expressed as a ratio of airway diameter (D) and total area, respectively, were measured at five levels. RESULTS: Positive bacterial cultures were obtained in 29 patients, with H. influenzae, P. aeruginosa and S. aureus being the commonest strains. Logistic regression analysis showed that this was associated with the duration of asthma and the exacerbations during the past year. In airways > 2 mm, there was no significant difference in WA (67.5 +/- 5.4 vs 66.4 +/- 5.4) and WT/D (21.6 +/- 2.7 vs 21.3 +/- 2.4) between the culture negative versus positive groups. Similarly, in airways (</= 2 mm), there were no significant differences in these parameters. The ratio of radicalwall area to Pi was negatively correlated with FEV1% predicted (p < 0.05). CONCLUSIONS: Bacterial colonization of the lower airways is common in patients with chronic severe asthma and is linked to the duration of asthma and having had exacerbations in the past year, but not with an increase in airway wall thickness. | - |
dc.language | eng | - |
dc.publisher | BioMed Central Ltd. The Journal's web site is located at http://respiratory-research.com/ | - |
dc.relation.ispartof | Respiratory Research | - |
dc.rights | Respiratory Research. Copyright © BioMed Central Ltd. | - |
dc.subject | Airway wall thickness | - |
dc.subject | Severe asthma | - |
dc.subject | Sputum bacteria | - |
dc.subject.mesh | Airway Remodeling | - |
dc.subject.mesh | Asthma - microbiology - radiography | - |
dc.subject.mesh | Haemophilus influenzae - isolation and purification | - |
dc.subject.mesh | Pseudomonas aeruginosa - isolation and purification | - |
dc.subject.mesh | Severity of Illness Index | - |
dc.title | Bacteria in sputum of stable severe asthma and increased airway wall thickness | en_US |
dc.type | Article | en_US |
dc.identifier.email | Hui, CK: chris.hui@hku.hk | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1186/1465-9921-13-35 | - |
dc.identifier.pmid | 22513083 | - |
dc.identifier.pmcid | PMC3351013 | - |
dc.identifier.scopus | eid_2-s2.0-84859793554 | - |
dc.identifier.volume | 13 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | Article no. 35 | - |
dc.identifier.epage | Article no. 35 | - |
dc.identifier.isi | WOS:000304059600001 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 1465-9921 | - |