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  • Title: The effect of naloxone on C-fiber reflex in cats.
    Author: Matsumiya T, Oka T.
    Journal: Tokai J Exp Clin Med; 1984 Aug; 9(3):223-30. PubMed ID: 6537670.
    Abstract:
    The specific opiate antagonist naloxone rapidly reverses hypotension caused by endotoxin, hypovolemia and spinal transection. The fact that naloxone appears to act as a causative level to improve shock pathophysiology, as well as its extensive clinical use for opiate overdose, makes this drug a particularly clinical use for opiate overdose, makes this drug a particularly attractive potential therapeutic agent for the treatment of shock in humans. The electrophysiological effects of naloxone were studied on c-fiber reflex in spinal and intact cats. The drugs were injected in to the right cephalic vein. Results can be summarized as follows: Naloxone in the intact cat had a more pronounced facilitating effect than in the spinal cat. Naloxone given as a one shot injection was more potentiating than naloxone given as a 5 minute injection. Naloxone antagonized the facilitation of a small dose of ketamine-HCL in the intact cat and also the depression of a large dose ketamine-HCL. Naloxone antagonized capsaicin on c-fiber reflex. This result supports that naloxone has the antagonizable inhibitory effect of substance-P. Naloxone for the first injection had an effective response but additional naloxone did not facilitate the c-fiber reflex.
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