Bin Shu, Huiting Liu, Xuemei Zheng, Jianrong He, Yingcai Wu, Jie Chen, Yuanjing Chen, Hongni Tian, Dapeng Ju, He Huang, Guangyou Duan
BACKGROUND: Opioids are metabolised by enzymes the activities of which vary with the circadian rhythm. We examined whether opioid infusions administered at different times of the day produce varying degrees of opioid-induced hyperalgesia (OIH) in animal experiments and clinical studies. METHODS: Male Sprague-Dawley rats received remifentanil infusions (1 μg kg-1 ·min-1 for 1 h) at Zeitgeber times (ZT) 0, 4, 8, 12, 16, or 20 h. Rhythmicity of mechanical hypersensitivity was assayed after the infusion...
December 2023: British Journal of Anaesthesia