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Diaphragm Myeloperoxidase (MPO) and interleukin 8 (IL-8) levels after 4 hours of oleic acid injury in Heliox and Nitrox groups are presented as normalized for total protein concentration in the diaphragm. (a) MPO trended lower in the Heliox group compared to Nitrox group, not statistically significant (P 0.07). (b) IL-8 levels were significantly lower in the Heliox group after 4 hours of spontaneous breathing, post oleic acid injury (* P < 0.01).
