“…[24][25][26] The mitigating effect of yohimbine on ketamine-induced potentiation of morphine antinociception is consistent with the hypothesis that adrenergic agonists either prolong the opiate analgesia or reduce the need for postoperative opioid analgesics. 27,28) Many studies have suggested that the opening of ATP-sensitive K-channels plays an important role in the antinociception induced by morphine at supraspinal, spinal and peripheral levels. [29][30][31] In our studies, glibenclamide, an antagonist failed to modify the ketamine response on morphine antinociception, indicating that ATP-sensitive K-channels play no role.…”