| The impact of inspired oxygen concentration on tissue oxygenation during progressive haemorrhage. | |
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MedLine Citation:
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PMID: 19618165 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Standard resuscitation practice for shock states mandates use of high flow, high concentration oxygen. However, this may induce microvascular constriction and potentially impair regional oxygen delivery. We thus investigated the impact of varying inspired oxygen concentrations in a rat model of progressive haemorrhage. METHODS: Tissue oxygen tension (the balance between local O2 supply and demand) was measured in four different organ beds (liver, renal cortex, muscle, bladder), with concurrent assessment of cardiorespiratory function and organ perfusion in a spontaneously breathing, anaesthetised rat model. 10% aliquots of circulating blood volume were removed at 15 min intervals until death. Different oxygen fractions in the gas mixture (0.15-1.0) were administered following 20% blood removal. A control group consisted of normovolaemic animals breathing varying oxygen fractions. RESULTS: Survival times following progressive haemorrhage were similar in animals breathing room air (98 +/- 10 min), 60% O2 (102 +/- 6 min) or 100% O2 (90 +/- 4 min), but significantly worse in those breathing 15% O2 (52 +/- 8 min, P < 0.01). Significant derangements of blood pressure, aortic blood flow and lactataemia were observed in both hypoxaemic and hyperoxaemic groups compared to normoxaemic animals. Breathing 100% O2 increased arterial PO2 sevenfold and tPO2 approximately threefold over baseline values during normovolaemia and mild haemorrhage (20% blood volume removal). However, with progressive haemorrhage, and despite maintained PaO2 values, tissue PO2 fell in line with the decrease in global oxygen delivery. CONCLUSION: Hypoxaemia and hyperoxaemia both compromised haemodynamics and biochemical markers of organ perfusion during severe, progressive haemorrhage. This may carry implications for resuscitation practice. |
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Authors:
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Alex Dyson; Ray Stidwill; Val Taylor; Mervyn Singer |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-07-18 |
Journal Detail:
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Title: Intensive care medicine Volume: 35 ISSN: 1432-1238 ISO Abbreviation: Intensive Care Med Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2009-09-25 Completed Date: 2010-02-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7704851 Medline TA: Intensive Care Med Country: United States |
Other Details:
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Languages: eng Pagination: 1783-91 Citation Subset: IM |
Affiliation:
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Bloomsbury Institute of Intensive Care Medicine, Department of Medicine and Wolfson Institute for Biomedical Research, University College London, Gower Street, London, UK. a.dyson@ucl.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Disease Progression Male Oxygen / administration & dosage*, metabolism* Oxygen Inhalation Therapy* Rats Rats, Wistar Shock, Hemorrhagic / metabolism* |
| Grant Support | |
ID/Acronym/Agency:
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//Medical Research Council |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
| Comments/Corrections | |
Comment In:
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Intensive Care Med. 2009 Oct;35(10):1664-6
[PMID:
19618166
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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