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Abstract
Objective: To examine the relation between the stimulation of the abdominal sympathetic nervous system and vasospasm of the brain in eclamptic seizures, we analyzed brain blood flow after stimulation of the celiac ganglion by lipopolysaccharide (LPS, 5, 50, or 500 mg/mL) or normal saline before and after denovation of sympathetic trunk in pregnant and nonpregnant rats.
Methods: The brain blood flow was measured after stimulation of the celiac ganglion with 50 μL (5 mg/mL) LPS in group 1,50 μL (50 mg/mL) LPS in group II, 50 μL saline in group III, and 50 μL (500 mg/mL) LPS (after denovation of the sympathetic trunk) in group IV. A sham control experiment was also done by stimulation of the abdominal peritoneum with 50 μL (500 mg/mL) LPS in group V. Changes in water content and histological findings in the brain were also studied in this protocol.
Results: A significant reduction in brain blood flow was observed in pregnant rats in groups I and II on stimulation of the celiac ganglion with LPS (p<0.0001, p<0.001) compared with before stimulation. Celiac ganglion stimulation with saline (group III) and LPS (group IV, after denovation of the sympathetic trunk) did not affect brain blood flow. Stimulation of the abdominal peritoneum with LPS (group V) could not induce any changes in brain blood flow. Repeated seizures occurred in 60% of pregnant rats and a remarkable increase in water content was observed after LPS stimulation of the celiac ganglion in groups I and II (p<0.0001, p<0.001). Histologically, we found that stimulation of the celiac ganglion with LPS caused widening of perivascular spaces with compression of the vessels leading to ischemic changes in brain tissues. There were no such findings observed in other groups. However, a lesser extent effect was noticed in nonpregnant than seen in pregnant rats.
Conclusion: Stimulation of the abdominal sympathetic ganglions could induce vasoconstriction of the brain vessels, thus decreasing brain blood flow, which results in eclampsialike changes in rats.