Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/44156
Title: Dynamic hyperinflation during treadmill exercise testing in patients with moderate to severe COPD
Other Titles: Comportamento da hiperinsuflação dinâmica em teste em esteira rolante em pacientes com DPOC moderada a grave
Authors: Cordoni, Priscila Kessar
Berton, Danilo Cortozi
Squassoni, Selma Denis
Scuarcialupi, Maria Enedina Aquino
Neder, Jose Alberto [UNIFESP]
Fiss, Elie
Universidade Federal do ABC (UFABC)
Federacao Estabelecimentos Ensino Super Novo Hamb
Fac Med & Ciencias Med Paraiba
Universidade Federal de São Paulo (UNIFESP)
Keywords: Pulmonary disease, chronic obstructive
Exercise
Exercise test
Inspiratory capacity
Issue Date: 1-Jan-2012
Publisher: Soc Brasileira Pneumologia Tisiologia
Citation: Jornal Brasileiro De Pneumologia. Brasilia Df: Soc Brasileira Pneumologia Tisiologia, v. 38, n. 1, p. 13-23, 2012.
Abstract: Objective: To characterize the presence, extent, and patterns of dynamic hyperinflation (DH) during treadmill exercise testing in patients with moderate to severe COPD. Methods: This was a cross-sectional study involving 30 non-hypoxemic patients (FEV1 = 43 +/- 14% of predicted) who were submitted to a cardiopulmonary exercise test on a treadmill at a constant speed (70-80% of maximum speed) to the tolerance limit (Tlim). Serial inspiratory capacity (1C) maneuvers were used in order to assess DH. Results: Of the 30 patients studied, 19 (63.3%) presented with OH (DH+ group), having greater pulmonary function impairment at rest than did those without UN (OH group). None of the variables studied correlated with exercise tolerance in the DH- group, whereas Tlim, 1C, and perception of dyspnea during exercise did so correlate in the DH+ group (p < 0.05). In the DH+ group, 7 and 12 patients, respectively, presented with a progressive and a stable pattern of DH (Delta 1C(Tlim,2min)= -0.28 +/- 0.11 L vs. 0.04 +/- 0.10 L; p <0.01). Patients with a progressive pattern of DH presented with higher perception of dyspnea/Tlim rate and lower exercise tolerance than did those with a stable pattern (354 +/- 118 s and 465 +/- 178 s, respectively; p < 0.05). Conclusions: The presence of DH is not a universal phenomenon during walking in COPD patients, even in those with moderate to severe airflow limitation. In the patients who presented DH, a progressive pattern of DH had a greater impact on exercise tolerance than did a stable pattern of DH.
URI: http://repositorio.unifesp.br/11600/44156
ISSN: 1806-3713
Other Identifiers: http://dx.doi.org/10.1590/S1806-37132012000100004
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