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In severe sepsis, many pathophysiologic mechanisms are involved in progression to organ failure, and oxygen free radical and antioxidants are known to contribute to this process. Oxygen free radical and antioxidants contribute to progression of organ failure in severe sepsis. In fact, oxygen radical activity has been reported to be correlated with disease severity and prognosis in patients with severe sepsis or septic shock. Accordingly, we aim to assess the usefulness of oxygen free radical and antioxidant concentrations to predict the disease severity and mortality in a cohort of critically ill surgical patients.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods\/Design<\/jats:title>\n            <jats:p>This is a prospective observation study including patient demographic characteristics, clinical information, blood sampling\/serum oxygen radical activity, serum antioxidant activity, serum antioxidant concentrations (zinc, selenium and glutamate), disease severity scores, outcomes, lengths of stay in intensive care unit, hospital 30-day mortality.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1749-7922-8-18","type":"journal-article","created":{"date-parts":[[2013,5,3]],"date-time":"2013-05-03T22:14:25Z","timestamp":1367619265000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Correlation of the oxygen radical activity and antioxidants and severity in critically ill surgical patients \u2013 study protocol"],"prefix":"10.1186","volume":"8","author":[{"given":"Hongjin","family":"Shim","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ji Young","family":"Jang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung Hwan","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jae Gil","family":"Lee","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,5,3]]},"reference":[{"key":"294_CR1","doi-asserted-by":"crossref","first-page":"230","DOI":"10.1186\/cc9098","volume":"14","author":"H Galley","year":"2010","unstructured":"Galley H: Bench-to-bedside review: targeting antioxidants to mitochondria in sepsis. 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