CAT and Sepsis: Oxidative stress is present in the early stages of sepsis and, on the one hand, oxidative stress is associated with endoplasmic reticulum stress and excessive endoplasmic reticulum stress is closely related to sepsis-induced neuronal damage [27], and on the other hand, oxidative stress leads to a decrease in the synthesis of intracellular ATP and an increase in the ratio between the activities of superoxide dismutase and catalase [28].