Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma

Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma

Abstract Objective: To analyze and compare lung function of obese and healthy, normal-weight children and adolescents, without asthma, through spirometry and volumetric capnography. Methods: Cross-sectional study including 77 subjects (38 obese) aged 5-17 years. All subjects underwent spirometry and volumetric capnography. The evaluations were repeated in obese subjects after the use of a bronchodilator. Results: At the spirometry assessment, obese individuals, when compared with the control group, showed lower values of forced expiratory volume in the first second by forced vital capacity (FEV1/FVC) and expiratory flows at 75% and between 25 and 75% of the FVC (p < 0.05). Volumetric capnography showed that obese individuals had a higher volume of produced carbon dioxide and alveolar tidal volume (p < 0.05). Additionally, the associations between dead space volume and tidal volume, as well as phase-3 slope normalized by tidal volume, were lower in healthy subjects (p < 0.05). These data suggest that obesity does not alter ventilation homogeneity, but flow homogeneity. After subdividing the groups by age, a greater difference in lung function was observed in obese and healthy individuals aged >11 years (p < 0.05). Conclusion: Even without the diagnosis of asthma by clinical criteria and without response to bronchodilator use, obese individuals showed lower FEV1/FVC values and forced expiratory flow, indicating the presence of an obstructive process. Volumetric capnography showed that obese individuals had higher alveolar tidal volume, with no alterations in ventilation homogeneity, suggesting flow alterations, without affecting lung volumes.

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Autores principales: Ferreira,Mariana S., Mendes,Roberto T., Marson,Fernando A.L., Zambon,Mariana P., Antonio,Maria A.R.G.M., Paschoal,Ilma A., Toro,Adyléia A.D.C., Severino,Silvana D., Ribeiro,Maria A.G.O., Ribeiro,José D.
Formato: Digital revista
Idioma:English
Publicado: Sociedade Brasileira de Pediatria 2017
Acceso en línea:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0021-75572017000400398
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spelling oai:scielo:S0021-755720170004003982017-08-21Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthmaFerreira,Mariana S.Mendes,Roberto T.Marson,Fernando A.L.Zambon,Mariana P.Antonio,Maria A.R.G.M.Paschoal,Ilma A.Toro,Adyléia A.D.C.Severino,Silvana D.Ribeiro,Maria A.G.O.Ribeiro,José D. Capnography Spirometry Obesity Abstract Objective: To analyze and compare lung function of obese and healthy, normal-weight children and adolescents, without asthma, through spirometry and volumetric capnography. Methods: Cross-sectional study including 77 subjects (38 obese) aged 5-17 years. All subjects underwent spirometry and volumetric capnography. The evaluations were repeated in obese subjects after the use of a bronchodilator. Results: At the spirometry assessment, obese individuals, when compared with the control group, showed lower values of forced expiratory volume in the first second by forced vital capacity (FEV1/FVC) and expiratory flows at 75% and between 25 and 75% of the FVC (p < 0.05). Volumetric capnography showed that obese individuals had a higher volume of produced carbon dioxide and alveolar tidal volume (p < 0.05). Additionally, the associations between dead space volume and tidal volume, as well as phase-3 slope normalized by tidal volume, were lower in healthy subjects (p < 0.05). These data suggest that obesity does not alter ventilation homogeneity, but flow homogeneity. After subdividing the groups by age, a greater difference in lung function was observed in obese and healthy individuals aged >11 years (p < 0.05). Conclusion: Even without the diagnosis of asthma by clinical criteria and without response to bronchodilator use, obese individuals showed lower FEV1/FVC values and forced expiratory flow, indicating the presence of an obstructive process. Volumetric capnography showed that obese individuals had higher alveolar tidal volume, with no alterations in ventilation homogeneity, suggesting flow alterations, without affecting lung volumes.info:eu-repo/semantics/openAccessSociedade Brasileira de PediatriaJornal de Pediatria v.93 n.4 20172017-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0021-75572017000400398en10.1016/j.jped.2016.10.007
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language English
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author Ferreira,Mariana S.
Mendes,Roberto T.
Marson,Fernando A.L.
Zambon,Mariana P.
Antonio,Maria A.R.G.M.
Paschoal,Ilma A.
Toro,Adyléia A.D.C.
Severino,Silvana D.
Ribeiro,Maria A.G.O.
Ribeiro,José D.
spellingShingle Ferreira,Mariana S.
Mendes,Roberto T.
Marson,Fernando A.L.
Zambon,Mariana P.
Antonio,Maria A.R.G.M.
Paschoal,Ilma A.
Toro,Adyléia A.D.C.
Severino,Silvana D.
Ribeiro,Maria A.G.O.
Ribeiro,José D.
Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
author_facet Ferreira,Mariana S.
Mendes,Roberto T.
Marson,Fernando A.L.
Zambon,Mariana P.
Antonio,Maria A.R.G.M.
Paschoal,Ilma A.
Toro,Adyléia A.D.C.
Severino,Silvana D.
Ribeiro,Maria A.G.O.
Ribeiro,José D.
author_sort Ferreira,Mariana S.
title Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
title_short Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
title_full Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
title_fullStr Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
title_full_unstemmed Spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
title_sort spirometry and volumetric capnography in lung function assessment of obese and normal-weight individuals without asthma
description Abstract Objective: To analyze and compare lung function of obese and healthy, normal-weight children and adolescents, without asthma, through spirometry and volumetric capnography. Methods: Cross-sectional study including 77 subjects (38 obese) aged 5-17 years. All subjects underwent spirometry and volumetric capnography. The evaluations were repeated in obese subjects after the use of a bronchodilator. Results: At the spirometry assessment, obese individuals, when compared with the control group, showed lower values of forced expiratory volume in the first second by forced vital capacity (FEV1/FVC) and expiratory flows at 75% and between 25 and 75% of the FVC (p < 0.05). Volumetric capnography showed that obese individuals had a higher volume of produced carbon dioxide and alveolar tidal volume (p < 0.05). Additionally, the associations between dead space volume and tidal volume, as well as phase-3 slope normalized by tidal volume, were lower in healthy subjects (p < 0.05). These data suggest that obesity does not alter ventilation homogeneity, but flow homogeneity. After subdividing the groups by age, a greater difference in lung function was observed in obese and healthy individuals aged >11 years (p < 0.05). Conclusion: Even without the diagnosis of asthma by clinical criteria and without response to bronchodilator use, obese individuals showed lower FEV1/FVC values and forced expiratory flow, indicating the presence of an obstructive process. Volumetric capnography showed that obese individuals had higher alveolar tidal volume, with no alterations in ventilation homogeneity, suggesting flow alterations, without affecting lung volumes.
publisher Sociedade Brasileira de Pediatria
publishDate 2017
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0021-75572017000400398
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