Objective To investigate the plasma extravasation of visceral organs caused by electrical stimulation of acupoint under the dorsal root reflex and axon reflex conditions. Methods By the means of measuring the content of Evans blue, this study investigated the plasma extravasation of visceral organs induced by electrical stimulation of acupoint "Zusanli"(ST 36).Results The Evans blue content in the visceral organs such as liver, spleen, pancreas and the whole gastrointestinal tract in rats increased significantly after electrical stimulation of acupoint "Zusanli" compared with that of the control group (P<0.01). The Evans blue extravasation in the above visceral organs was blocked by pre-treatment of capsaicin (66 mmol·L -1, 50 μL) into the acupoint. Conclusion The neurogenic inflammation of the visceral organs evoked by electrical stimulation of acupoint was mediated by the capsaicin-sensitive afferent fibers through the dorsal root reflex and axon reflex. It is a new method to study the correlation of meridian-viscera.
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