TNF and myocardial ischemia: The valerian extract can prevent injuries to myocardial ischemia reperfusion model in the rabbit by decreasing the levels of xanthine oxidase (XOD), malondialdehyde (MDA), and tumor necrosis factor-α (TNF-α), thereby increasing the 6-keto-prostaglandin F1α/thromboxane B2 (6-keto-PGF1α/TXB2) ratio.