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Bronchial thermoplasty reduces airway resistance

BACKGROUND: The mechanism for symptomatic improvement after bronchial thermoplasty (BT) is unclear, since spirometry reveals little or no change. In this study, the effects of BT on airway resistance were examined using two independent techniques. METHODS: Eighteen consecutive patients, with severe...

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Autores principales: Langton, David, Bennetts, Kim, Noble, Peter, Plummer, Virginia, Thien, Francis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7106594/
https://www.ncbi.nlm.nih.gov/pubmed/32228586
http://dx.doi.org/10.1186/s12931-020-1330-5
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author Langton, David
Bennetts, Kim
Noble, Peter
Plummer, Virginia
Thien, Francis
author_facet Langton, David
Bennetts, Kim
Noble, Peter
Plummer, Virginia
Thien, Francis
author_sort Langton, David
collection PubMed
description BACKGROUND: The mechanism for symptomatic improvement after bronchial thermoplasty (BT) is unclear, since spirometry reveals little or no change. In this study, the effects of BT on airway resistance were examined using two independent techniques. METHODS: Eighteen consecutive patients, with severe asthma (57.6 ± 14.2 years) were evaluated by spirometry and plethysmography at three time points: (i) baseline, (ii) left lung treated but right lung untreated and (iii) 6 weeks after both lungs were treated with BT. At each assessment, total and specific airway resistance (Raw, sRaw) were measured. High resolution CT scans were undertaken at the first two assessments, and measurements of lobar volume, airway volume and airway resistance were made. The Asthma Control Questionnaire (ACQ) was administered at each assessment. RESULTS: The baseline ACQ score was 3.5 ± 0.9, and improved progressively to 1.8 ± 1.2 (p < 0.01). At baseline, severe airflow obstruction was observed, FEV1 44.8 ± 13.7% predicted, together with gas trapping, and elevated Raw at 342 ± 173%predicted. Following BT, significant improvements in Raw and sRaw were observed, as well as a reduction in Residual Volume, increase in Vital Capacity and no change in FEV1. The change in Raw correlated with the change in ACQ (r = 0.56, p < 0.05). CT scans demonstrated reduced airway volume at baseline, which correlated with the increased Raw determined by plethysmography (p = − 0.536, p = < 0.05). Following BT, the airway volume increased in the treated lung, and this was accompanied by a significant reduction in CT-determined local airway resistance. CONCLUSION: Symptomatic improvement after BT is mediated by increased airway volume and reduced airway resistance.
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spelling pubmed-71065942020-04-01 Bronchial thermoplasty reduces airway resistance Langton, David Bennetts, Kim Noble, Peter Plummer, Virginia Thien, Francis Respir Res Research BACKGROUND: The mechanism for symptomatic improvement after bronchial thermoplasty (BT) is unclear, since spirometry reveals little or no change. In this study, the effects of BT on airway resistance were examined using two independent techniques. METHODS: Eighteen consecutive patients, with severe asthma (57.6 ± 14.2 years) were evaluated by spirometry and plethysmography at three time points: (i) baseline, (ii) left lung treated but right lung untreated and (iii) 6 weeks after both lungs were treated with BT. At each assessment, total and specific airway resistance (Raw, sRaw) were measured. High resolution CT scans were undertaken at the first two assessments, and measurements of lobar volume, airway volume and airway resistance were made. The Asthma Control Questionnaire (ACQ) was administered at each assessment. RESULTS: The baseline ACQ score was 3.5 ± 0.9, and improved progressively to 1.8 ± 1.2 (p < 0.01). At baseline, severe airflow obstruction was observed, FEV1 44.8 ± 13.7% predicted, together with gas trapping, and elevated Raw at 342 ± 173%predicted. Following BT, significant improvements in Raw and sRaw were observed, as well as a reduction in Residual Volume, increase in Vital Capacity and no change in FEV1. The change in Raw correlated with the change in ACQ (r = 0.56, p < 0.05). CT scans demonstrated reduced airway volume at baseline, which correlated with the increased Raw determined by plethysmography (p = − 0.536, p = < 0.05). Following BT, the airway volume increased in the treated lung, and this was accompanied by a significant reduction in CT-determined local airway resistance. CONCLUSION: Symptomatic improvement after BT is mediated by increased airway volume and reduced airway resistance. BioMed Central 2020-03-30 2020 /pmc/articles/PMC7106594/ /pubmed/32228586 http://dx.doi.org/10.1186/s12931-020-1330-5 Text en © The Author(s). 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
spellingShingle Research
Langton, David
Bennetts, Kim
Noble, Peter
Plummer, Virginia
Thien, Francis
Bronchial thermoplasty reduces airway resistance
title Bronchial thermoplasty reduces airway resistance
title_full Bronchial thermoplasty reduces airway resistance
title_fullStr Bronchial thermoplasty reduces airway resistance
title_full_unstemmed Bronchial thermoplasty reduces airway resistance
title_short Bronchial thermoplasty reduces airway resistance
title_sort bronchial thermoplasty reduces airway resistance
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7106594/
https://www.ncbi.nlm.nih.gov/pubmed/32228586
http://dx.doi.org/10.1186/s12931-020-1330-5
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