Document Detail

Dynamic hyperinflation during treadmill exercise testing in patients with moderate to severe COPD.
MedLine Citation:
PMID:  22407036     Owner:  NLM     Status:  MEDLINE    
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 (IC) maneuvers were used in order to assess DH.
RESULTS: Of the 30 patients studied, 19 (63.3%) presented with DH (DH+ group), having greater pulmonary function impairment at rest than did those without DH (DH- group). None of the variables studied correlated with exercise tolerance in the DH- group, whereas Tlim, IC, 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 (ΔIC 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.
Priscila Kessar Cordoni; Danilo Cortozi Berton; Selma Denis Squassoni; Maria Enedina Aquino Scuarcialupi; José Alberto Neder; Elie Fiss
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Jornal brasileiro de pneumologia : publicaça̋o oficial da Sociedade Brasileira de Pneumologia e Tisilogia     Volume:  38     ISSN:  1806-3756     ISO Abbreviation:  J Bras Pneumol     Publication Date:    2012 Jan-Feb
Date Detail:
Created Date:  2012-03-12     Completed Date:  2012-09-14     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  101222274     Medline TA:  J Bras Pneumol     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  13-23     Citation Subset:  IM    
Department of Pulmonology, ABC School of Medicine, Santo André, Brazil.
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MeSH Terms
Cross-Sectional Studies
Dyspnea / physiopathology*
Exercise Test / methods*
Exercise Tolerance / physiology*
Inspiratory Capacity / physiology
Lung / physiopathology
Pulmonary Disease, Chronic Obstructive / classification,  physiopathology*
Statistics, Nonparametric
Comment In:
J Bras Pneumol. 2012 Jan-Feb;38(1):1-3   [PMID:  22407033 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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