【摘要】 19只猫,用α-氯醛醣麻醉、三碘季铵酚麻痹和人工呼吸。电刺激左侧内脏大神经中枢端。刺激A类纤维,其传导速度为40～60米/秒,引起血压降低或升高,这些反应取决于刺激频率,用频率1Hz刺激时,引起血压下降;频率20Hz刺激,则引起血压升高。阳极电流阻断A类传入纤维后,刺激C类纤维,其传导速度为0.5～2米/秒,则引起血压升高。这些结果表明,内脏大神经传入纤维兴奋的血压效应取决于纤维类型和刺激频率。更多还原

【Abstract】 19 cats were anesthetized with a-chloralose, paraly/ed with gallamine trit! iodide and artificially ventilated. The proximal end of cut left greater splanc’ nic nerve was stimulated. Stimulation of A-type fibers of which the condution velocity is 4C-60 m/s resulted in depressor or pressor responses, depending on stimulation frequency, stimulation with1Hz elicited depressor responses. Stimulation with 20Hz caused pressor response. After the condution of A-fibers was blocked with anodal current, excitation of C-type fibers of which the conduction velocity is 0.5-2m/s resulted in pressor response. These data suggest that responses of blood pressure to stimulation of splanc’ nic afferents depend on the fiber types and the stimulation frequencies.更多还原