Document Detail


Optimal oxygen pressure and time for reduced bubble formation in the N2-saturated decompressed prawn.
MedLine Citation:
PMID:  15579569     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Bubbles that grow during decompression are believed to originate from preexisting gas micronuclei. We showed that pretreatment of prawns with 203 kPa oxygen before nitrogen loading reduced the number of bubbles that evolved on decompression, presumably owing to the alteration or elimination of gas micronuclei (Arieli Y, Arieli R, and Marx A. J Appl Physiol 92: 2596-2599, 2002). The present study examines the optimal pretreatment for this assumed crushing of gas micronuclei. Transparent prawns were subjected to various exposure times (0, 5, 10, 15, and 20 min) at an oxygen pressure of 203 kPa and to 5 min at different oxygen pressures (PO2 values of 101, 151, 203, 405, 608, and 810 kPa), before nitrogen loading at 203 kPa followed by explosive decompression. After the decompression, bubble density and total gas volume were measured with a light microscope equipped with a video camera. Five minutes at a PO2 of 405 kPa yielded maximal reduction of bubble density and total gas volume by 52 and 71%, respectively. It has been reported that 2-3 h of hyperbaric oxygen at bottom pressure was required to protect saturation divers decompressed on oxygen against decompression sickness. If there is a shorter pretreatment that is applicable to humans, this will be of great advantage in diving and escape from submarines.
Authors:
O Ertracht; R Arieli; Y Arieli; R Ron; Z Erlichman; Y Adir
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-12-03
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  98     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-17     Completed Date:  2005-07-05     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:  1309-13     Citation Subset:  IM    
Affiliation:
Israel Naval Medical Institute, POB 8040, Haifa 31080, Israel.
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MeSH Terms
Descriptor/Qualifier:
Animals
Decompression / methods*
Hyperbaric Oxygenation / methods*
Nitrogen / administration & dosage*,  metabolism*
Oxygen / administration & dosage*,  metabolism*
Palaemonidae / drug effects*,  physiology*
Pressure
Pulmonary Gas Exchange / physiology*
Chemical
Reg. No./Substance:
7727-37-9/Nitrogen; 7782-44-7/Oxygen

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


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