Effect of stellate ganglion block on inflammatory nociceptive response and Fos expression of interbrain in rabbits / 医学研究生学报

ABSTRACT

Objective: To investigate formalin-induced inflammatory nociceptive response and Fos expression of interbrain following stellate ganglion block (SGB) in rabbits. Methods: Catheters were inserted closely to right stellate ganglia in rabbits.One week later,twenty-four rabbits were randomly divided into three groups of 8 eachsham group,SGB group and control group,receiving 0.5ml of normal saline,3% formalin and 3% formalin stimulation by intraplantar injection into the right front paw, respectively. ten mins before stimulation,0.5ml of 0.25% bupivacaine was administered via the catheter in SGB group,while 0.5ml of normal saline in sham group and control group. Nociceptive response was observed for 60min using weighted pain score. Local inflammatory response was measured by histopathology, the expression of Fos of interbrain was measured with immunohistochemistry 2 hours after stimulation. Results: Formalin-induced nociceptive behavior in phase 2 and local inflammatory response were relieved following SGB; the average numbers of Fos-positive neurons of hypothalamus in SGB group was lower than that in control group( P 0.05). Conclusion: SGB suppresses formalin-induced Fos expression of hypothalamus.