CAT and myocardial infarction: It is now well understood that oxidative stress, produced by isoproterenol (ISO) is mediated through free radicals or reactive oxygen species (ROS), as evidenced by marked increase in tissue lipid peroxidation (LPO) and decreased levels of antioxidants such as superoxide dismutase (SOD), catalase (CAT) and reduced glutathione (GSH), which play a major role in the protection from myocardial infarction (MI)6.