Document Detail


Pulmonary capillary blood volume and membrane conductance in Andeans and lowlanders at high altitude: a cross-sectional study.
MedLine Citation:
PMID:  20573559     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Lung carbon monoxide (CO) transfer and pulmonary capillary blood volume (Vc) at high altitudes have been reported as being higher in native highlanders compared to acclimatised lowlanders but large discrepancies appears between the studies. This finding raises the question of whether hypoxia induces pulmonary angiogenesis. Eighteen highlanders living in Bolivia and 16 European lowlander volunteers were studied. The latter were studied both at sea level and after acclimatisation to high altitude. Membrane conductance (Dm(CO)) and Vc, corrected for the haemoglobin concentration (Vc(cor)), were calculated using the NO/CO transfer technique. Pulmonary arterial pressure and left atrial pressures were estimated using echocardiography. Highlanders exhibited significantly higher NO and CO transfer than acclimatised lowlanders, with Vc(cor)/VA and Dm(CO)/VA being 49 and 17% greater (VA: alveolar volume) in highlanders, respectively. In acclimatised lowlanders, Dm(CO) and Dm(CO)/VA values were lower at high altitudes than at sea level. Echocardiographic estimates of cardiac output and pulmonary arterial pressure were significantly elevated at high altitudes as compared to sea level. The decrease in Dm(CO) in lowlanders might be due to altered gas transport in the airways due to the low density of air at high altitudes. The disproportionate increase in Vc in Andeans compared to the change in Dm(CO) suggests that the recruitment of capillaries is associated with a thickening of the blood capillary sheet. Since there was no correlation between the increase in Vc and the slight alterations in haemodynamics, this data suggests that chronic hypoxia might stimulate pulmonary angiogenesis in Andeans who live at high altitudes.
Authors:
Claire de Bisschop; Laurent Kiger; Michael C Marden; Alfredo Ajata; Sandrine Huez; Vitalie Faoro; Jean-Benoit Martinot; Robert Naeije; Hervé Guénard
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Publication Detail:
Type:  Journal Article     Date:  2010-05-31
Journal Detail:
Title:  Nitric oxide : biology and chemistry / official journal of the Nitric Oxide Society     Volume:  23     ISSN:  1089-8611     ISO Abbreviation:  Nitric Oxide     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-08-25     Completed Date:  2011-01-14     Revised Date:  2014-08-16    
Medline Journal Info:
Nlm Unique ID:  9709307     Medline TA:  Nitric Oxide     Country:  United States    
Other Details:
Languages:  eng     Pagination:  187-93     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Inc. All rights reserved.
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MeSH Terms
Descriptor/Qualifier:
Adult
Altitude*
Altitude Sickness / metabolism,  physiopathology
Blood Volume*
Bolivia
Capillaries / physiopathology*
Cell Membrane / metabolism
Cross-Sectional Studies
Female
Humans
Hypertension, Pulmonary / complications,  diagnosis,  physiopathology*
Lung / blood supply,  physiopathology*
Male
Pulmonary Diffusing Capacity
Reproducibility of Results
Sensitivity and Specificity

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


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