Document Detail


Experimental analysis of critical oxygen delivery.
MedLine Citation:
PMID:  15513959     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Systemic variables were evaluated with respect to O(2) delivery to test the hypothesis that critical O(2) delivery and critical Hb can be estimated by multiple variables collected simultaneously. Rats were subjected to transfusion with either fresh or stored blood and then subjected to stepwise isovolemic hemodilution. Critical levels were measured by the dual-regression method from plots of systemic variables against O(2) delivery and Hb. Delivery was calculated from cardiac index and arterial O(2) content. We found that 1) after hemodilution, O(2) delivery changed in a nonlinear relationship with Hb; 2) critical delivery calculated using 30 different systemic variables was not statistically different from each other; 3) critical delivery and critical Hb were correlated but were not different between animals receiving fresh or stored blood; and 4) similar critical levels were found using a single variable from several animals and using several variables from the same subject. The best variables to estimate critical delivery were lactate, bicarbonate, base excess, O(2) extraction ratio, expired CO(2), pulse pressure, cardiac index, and systolic pressure. The data suggest that a multivariable analysis of critical delivery may help determine the physiological oxygenation boundary at the whole body level. This may assist in finding therapeutic triggers on an individual basis using systemic markers of the transition from aerobic to anaerobic metabolism.
Authors:
Ivo P Torres Filho; Bruce D Spiess; Roland N Pittman; R Wayne Barbee; Kevin R Ward
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-10-28
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  288     ISSN:  0363-6135     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-02-11     Completed Date:  2005-03-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H1071-9     Citation Subset:  IM    
Affiliation:
Department of Anesthesiology, Virginia Commonwealth University Reanimation Engineering Shock Center, Virginia Commonwealth University, Richmond, Virginia 23298-0695, USA. itorres@vcu.edu <itorres@vcu.edu>
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MeSH Terms
Descriptor/Qualifier:
Animals
Bicarbonates / blood
Blood Pressure
Blood Transfusion
Carbon Dioxide / blood
Hemodilution*
Hemoglobins / metabolism*
Lactic Acid / blood
Male
Models, Animal
Oxygen / pharmacokinetics*
Oxygen Consumption / physiology*
Rats
Rats, Sprague-Dawley
Chemical
Reg. No./Substance:
0/Bicarbonates; 0/Hemoglobins; 124-38-9/Carbon Dioxide; 50-21-5/Lactic Acid; 7782-44-7/Oxygen

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


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