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A vast amount of circumstantial evidence implicates oxygen-derived free radicals (especially superoxide and hydroxyl radical) and high-energy oxidants (such as peroxynitrite) as mediators of inflammation, shock, and ischemia/reperfusion injury. The aim of this review is to describe recent developments in the field of oxidative stress research. The first part of the review focuses on the roles of reactive oxygen species (ROS) in shock, inflammation, and ischemia/reperfusion injury. The second part of the review deals with the novel findings using recently identified pharmacological tools (e.g., peroxynitrite decomposition catalysts and selective superoxide dismutase mimetics (SODm) in shock, ischemia/reperfusion, and inflammation. 1) The role of ROS consists of immunohistochemical and biochemical evidence that demonstrates the production of ROS in shock, inflammation, and ischemia/reperfusion injury. ROS can …