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Relation between PaO2/FiO2 ratio, SpO2/FiO2 ratio, oxygenation index and ventilation ratio in critically ill patients

Authors
Journal
Critical Care
1364-8535
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Volume
17
Identifiers
DOI: 10.1186/cc12030
Keywords
  • Poster Presentation
Disciplines
  • Biology
  • Chemistry
  • Medicine

Abstract

untitled P1 Protective role of autophagy in mouse cecal ligation and puncture-induced sepsis model W Takahashi1, H Hatano2, H Hirasawa1, S Oda1 1Graduate School of Medicine, Chiba University, Chiba, Japan; 2Biomedical Research Center, Chiba University, Chiba, Japan Critical Care 2013, 17(Suppl 2):P1 (doi: 10.1186/cc11939) Introduction Autophagy is well known as one of the biogenic responses against various stresses, which possesses the benefi cial roles for survival, but little is known about the dynamics and its signifi cance during the septic condition. We hypothesized that autophagy is induced during the septic condition, and contributes to protect from tissue damage which subsequently leads to organ dysfunction. We confi rm whether the autophagic process is accelerated or sustained in an acute phase of sepsis and we also determine its physiological role. Methods Sepsis was induced by cecal ligation and puncture (CLP) in mice. We examined the kinetics of autophagosome and auto lysosome formation which may explain the status of autophagy by western blotting, immunohistochemistry, and electron microscopy. To investigate a precise role of autophagy in CLP-induced sepsis, chloroquine, an autophagy inhibitor, was administered to the CLP-operated mice, and blood chemistry, pathology of the liver and survival were evaluated. Results Autophagy demonstrated by the ratio of LC3-II/LC3-I was induced over the time course up to 24 hours after CLP. The ratio was particularly increased in the liver, heart and spleen. Autophagosome formation became maximal at 6 hours and declined by 24 hours after CLP. Autolysosome formation as evaluated by both fusion of GFP-LC3 dots with LAMP1 immunohistochemistry and electron microscopy was also increased after the procedure. Furthermore, inhibition of autophagy by chloroquine during the CLP procedure resulted in elevation of serum AST levels, and signifi cantly increased mortality in mice. Conclusion Autophagy was induced in several organs over

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