Document Detail


European EVA decompression sickness risks.
MedLine Citation:
PMID:  11537125     Owner:  NASA     Status:  MEDLINE    
Abstract/OtherAbstract:
For the first manned flight of Hermes there will be a capability of performing EVA. The European EVA Space Suit will be an anthropomorphic system with an internal pressure of 500 hPa of pure oxygen. The pressure reduction from the Hermes cabin pressure of 1013 hPa will induce a risk for Decompression Sickness (DCS) for the EVA crewmember if no adequate protective procedures are implemented. Specific decompression procedures have to be developed. From a critical review of the literature and by using knowledge gained from research conducted in the past in the fields of diving and aerospace medicine safe protective procedures are proposed for the European EVA scenario. An R factor of 1.2 and a tissue half-time (t1/2) of 360 minutes in a single-tissue model have been identified as appropriate operational values. On the basis of an acceptable risk level of approximately 1%, oxygen prebreathing times are proposed for (a) direct pressure reduction from 1013 hPa to a suit pressure of 500 hPa, and (b) staged decompression using a 700 hPa intermediate stage in the spacecraft cabin. In addition, factors which influence individual susceptibility to DCS are identified. Recommendations are also given in the areas of crew selection and medical monitoring requirements together with therapeutic measures that can be implemented in the Hermes scenario. A method for demonstration of the validity of proposed risks and procedures is proposed.
Authors:
L Vogt; J Wenzel; A I Skoog; S Luck; B Svensson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta astronautica     Volume:  23     ISSN:  0094-5765     ISO Abbreviation:  Acta Astronaut     Publication Date:  1991  
Date Detail:
Created Date:  1997-05-09     Completed Date:  1997-05-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9890631     Medline TA:  Acta Astronaut     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  195-205     Citation Subset:  S    
Affiliation:
DLR Institute of Aerospace Medicine, Koln, FRG.
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MeSH Terms
Descriptor/Qualifier:
Aerospace Medicine
Anoxia / physiopathology
Astronauts
Atmosphere Exposure Chambers
Atmospheric Pressure
Decompression Sickness / physiopathology,  prevention & control*,  therapy
Embolism, Air / physiopathology
Europe
Extravehicular Activity / adverse effects*,  physiology
Female
Humans
Hyperbaric Oxygenation
Male
Risk Assessment*
Space Flight*
Space Suits
Weightlessness*

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


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