目的：观察海马网络电活动在电针调整异常心血管活动中变化,以此探讨电针调整心血管活动的中枢机制。方法实验大鼠随机分3组,乌拉坦正常麻醉组(n=15),乌拉坦加强深麻醉组(n=9),正常麻醉肛管加压组(n=15)。3组均记录股动脉血压、心电和海马场电、细胞放电,正常麻醉组没有干预措施,后两组在成功诱发异常血压后采取电针干预。结果乌拉坦正常麻醉大鼠出现睡眠样周期性海马电活动交替、伴周期性心血管活动,theta 振荡对应心率加快；深麻醉低血压状态大鼠电针后海马网络出现 theta 振荡,伴血压升高,心率加快(P＜0.001)；肛管加压诱发血压升高心率加快、海马网络 theta 振荡出现,此期电针仍能激活 theta 相关细胞,且降低血压、减慢心率(P＜0.001)。结论海马网络 theta 振荡参与了电针对异常心血管活动的双向调整作用。%Objective To observe changes in hippocampal network electrical activities in electroacupuncture regulation of abnormal cardiovascular activities and explore the central mechanism of the regulation. Method Experimental rats were randomized into three groups: normal urethane anesthesia without electroacupuncture (n=15), urethane enhanced deep anesthesia (n=9) and normal anesthesia plus anal canal pressurization (n=15). Femoral arterial pressure, cardiac electricity, hippocampal field potentials and cellular discharge were recorded in the three groups. The normal anesthesia group did not receive intervention measures. The other two groups received acupuncture intervention after successful induction of abnormal blood pressure. Result In rats with normal urethane anesthesia, sleep-like periodic hippocampal electrical activity occurred with periodic cardiovascular activities and theta oscillations was corresponding to increased heart rates. In rats with deep anesthesia and hypotension, theta oscillations appeared in hippocampal network with increased blood pressure and heart rates after electroacupuncture (P<0.001). Anal canal pressurization induced increases in blood pressure and heart rates and caused theta oscillations in hippocampal network. During that time, electroacupuncture could still activate theta-related cells, reduce blood pressure and decrease heart rates (P<0.001). Conclusion Theta oscillations in hippocampal network are involved in the bidirectional regulating effect of electroacupuncture on abnormal cardiovascular activities.
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