Document Detail


Hemodynamic responses to acute hypoxia, hypobaria, and exercise in subjects susceptible to high-altitude pulmonary edema.
MedLine Citation:
PMID:  2532195     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To verify the presence of the constitutional abnormality implicated in the pathogenesis of high-altitude pulmonary edema (HAPE), we evaluated the hemodynamic responses to hypoxia, hypobaria, and exercise in HAPE-susceptible subjects (HAPE-S). HAPE-S were five males with a history of HAPE. Five healthy volunteers who had repeated experiences of mountain climbing without any history of altitude-related problems served as controls. HAPE-S showed much greater increase in pulmonary vascular resistance index (PVRI) than the control subjects, resulting in a much higher level of pulmonary arterial pressure (Ppa), under both acute hypoxia of 15% O2 (Ppa = 29.0 +/- 2.8 vs. 17.8 +/- 0.3 Torr, P less than 0.05) and acute hypobaria of 515 Torr (32.3 +/- 2.8 vs. 19.1 +/- 0.8 Torr, P less than 0.05). Also, PVRI in HAPE-S exhibited a tendency to increase even during light exercise with supine bicycle ergometer (50 W), whereas PVRI in the control subjects significantly decreased, so that HAPE-S showed a greater increase in Ppa (delta Ppa = 16.0 +/- 1.5 vs. 4.9 +/- 1.1 Torr, P less than 0.001) and a greater decrease in arterial oxygen tension (17.8 +/- 4.7 vs. 5.6 +/- 1.7 Torr, P less than 0.05). We thus conclude that HAPE-S have a constitutional abnormality, which can be evaluated at low altitude, in the pulmonary circulatory responses to possible causative factors of HAPE such as hypoxia, hypobaria, and exercise.
Authors:
A Kawashima; K Kubo; T Kobayashi; M Sekiguchi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  67     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1989 Nov 
Date Detail:
Created Date:  1990-02-08     Completed Date:  1990-02-08     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1982-9     Citation Subset:  IM; S    
Affiliation:
First Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
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MeSH Terms
Descriptor/Qualifier:
6-Ketoprostaglandin F1 alpha / blood
Adult
Altitude Sickness / blood,  physiopathology*
Anoxia / physiopathology*
Atmospheric Pressure
Atrial Natriuretic Factor / blood
Blood Gas Analysis
Disease Susceptibility
Hemodynamics
Humans
Male
Physical Exertion
Pulmonary Edema / blood,  etiology*,  physiopathology
Thromboxane B2 / blood
Chemical
Reg. No./Substance:
54397-85-2/Thromboxane B2; 58962-34-8/6-Ketoprostaglandin F1 alpha; 85637-73-6/Atrial Natriuretic Factor

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