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Abstract
It has been reported that naloxone may be useful in the treatment of hypovolemic shock. However, the effects of naloxone on cardiac energy metabolism in acute hemorrhage have not been investigated. The effects of naloxone on myocardial metabolism were evaluated in the rat during acute hemorrhage with crystalloid resuscitation. Intramyocardial high energy phosphates, pyruvate, lactate and glycogen were measured. There was no significant difference in high energy phosphates, energy charge, lactate and glycogen contents between control, 1 mg naloxone and 10 mg naloxone groups. However, pyruvate level in hearts in the 10 mg naloxone group was significantly higher than that in control group. Therefore, naloxone reduced the lactate/pyruvate (L/P) ratio. Although naloxone did not improve the mitochondrial function, it improved the oxidation-reduction state in cardiac energy metabolism.
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