2015
DOI: 10.1016/j.bjane.2013.09.013
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Hyperalgesic effect of subarachnoid administration of phentolamine in mice

Abstract: Background and objectives: Painful phenomenon is one of the most important and complex experiences. Phentolamine is a non-selective alpha-adrenergic antagonist. The objective of this study was to compare the effect of increasing doses of phentolamine into subarachnoid space in rats in the modulation of painful phenomenon. Methods: 84 male Wistar rats were divided into formalin and plantar incision groups, subdivided into six subgroups (n = 7). Control group received only saline (10 L); active subgroups receive… Show more

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“…From zero to five minutes are necessary to evaluate the painful sensitivity in the so-called neurogenic phase, in which the direct activation of nociceptors by the chemical agent occurs. Then, 15 to 30 minutes to determine pain sensitivity in the phase called inflammatory pain, which involves the spinal cord-reinforced synaptic transmission, as well as the release of local mediators such as prostaglandins and histamines 13 .…”
Section: Evaluation Of Analgesic And/or Anti-inflammatory Activity Bymentioning
confidence: 99%
“…From zero to five minutes are necessary to evaluate the painful sensitivity in the so-called neurogenic phase, in which the direct activation of nociceptors by the chemical agent occurs. Then, 15 to 30 minutes to determine pain sensitivity in the phase called inflammatory pain, which involves the spinal cord-reinforced synaptic transmission, as well as the release of local mediators such as prostaglandins and histamines 13 .…”
Section: Evaluation Of Analgesic And/or Anti-inflammatory Activity Bymentioning
confidence: 99%