Document Detail


Relationship between exercise desaturation and pulmonary haemodynamics in COPD patients.
MedLine Citation:
PMID:  15459136     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Pulmonary hypertension (PH) in patients with chronic obstructive pulmonary disease (COPD) has traditionally been explained as an effect of hypoxaemia. Recently, other mechanisms, such as arterial remodelling caused by inflammation, have been suggested. The aim of this study was to investigate whether exercise-induced PH (EIPH) could occur without concurrent hypoxaemia, and whether exercise-induced hypoxaemia (EIH) was regularly accompanied by increased pulmonary artery pressure or pulmonary vascular resistance index (PVRI). Pulmonary haemodynamics in 17 patients with COPD of varying severity, but with no or mild hypoxaemia at rest, were examined during exercise equivalent to the activities of daily living (ADL) and exhaustion. EIPH occurred in 65% of the patients during ADL exercise. Pulmonary arterial pressure during exercise was negatively correlated with arterial oxygen tension, but EIPH was not invariably accompanied by hypoxaemia. Conversely, EIPH was not found in all patients with EIH. The resting PVRI was negatively correlated with arterial oxygen tension during ADL exercise, but an elevated PVRI without EIH occurred in 35% of the patients. In conclusion, exercise-induced pulmonary hypertension occurred during exercise equivalent to the activities of daily living in chronic obstructive pulmonary disease patients with no or mild hypoxaemia at rest. Although pulmonary artery pressure and arterial oxygen tension were negatively correlated during exercise, a consistent relationship between hypoxaemia and pulmonary hypertension could not be demonstrated. This may indicate that mechanisms other than hypoxaemia contribute significantly in the development of pulmonary hypertension in these patients.
Authors:
C C Christensen; M S Ryg; A Edvardsen; O H Skjønsberg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The European respiratory journal     Volume:  24     ISSN:  0903-1936     ISO Abbreviation:  Eur. Respir. J.     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-10-01     Completed Date:  2005-04-12     Revised Date:  2013-05-23    
Medline Journal Info:
Nlm Unique ID:  8803460     Medline TA:  Eur Respir J     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  580-6     Citation Subset:  IM    
Affiliation:
Glittreklinikken, 1488, Hakadal, Norway. ca.chris@online.no
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MeSH Terms
Descriptor/Qualifier:
Activities of Daily Living
Anoxia / complications,  physiopathology
Blood Pressure
Exercise / physiology*
Fatigue
Female
Humans
Hypertension
Hypertension, Pulmonary / complications,  etiology,  physiopathology*
Male
Middle Aged
Oxygen / blood
Oxygen Consumption / physiology
Pulmonary Artery / physiology
Pulmonary Disease, Chronic Obstructive / complications,  physiopathology*
Pulmonary Gas Exchange / physiology
Respiratory Function Tests
Respiratory Mechanics / physiology
Vascular Resistance / physiology
Chemical
Reg. No./Substance:
7782-44-7/Oxygen
Comments/Corrections
Comment In:
Eur Respir J. 2005 Jun;25(6):1126-7   [PMID:  15929970 ]

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