Paradoxical effects of intracerebroventricular low-dose opioid antagonists in SHR with chronic pain.


The aim of our study was to investigate the effect of intracerebroventricular (i.c.v.) administration of very low doses of opioid antagonists on the pain threshold, arterial blood pressure and body temperature of spontaneously hypertensive rats (SHR) with chronic pain. We found that low doses of i.c.v. administered naloxone hydrochloride (0.3 microg) or… (More)


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