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作 者:陈默思 贾麟[1] 费宇杰[1] 马嵘[1] 杨莉[2] 王嘉陵[1]
机构地区:[1]华中科技大学同济医学院药理学系,湖北武汉430030 [2]湖北中医学院生理学教研室,湖北武汉430061
出 处:《中国医院药学杂志》2006年第6期658-661,共4页Chinese Journal of Hospital Pharmacy
基 金:华中科技大学科学基金支助项目(编号:31510026)
摘 要:目的:研究异莲心碱(isoliensinine,IL)对牵张性心律失常的拮抗效应。方法:采用离体心脏心外膜心电图和在体心脏单相动作电位记录技术,观察膨胀大鼠左心室腔和结扎豚鼠升主动脉引起的心律失常、单相动作电位时程缩短和触发活动变化。结果:IL(1,2.5,5μmol.L-1)能剂量依赖性地缩短膨胀引起的牵张性心律失常持续时间,从对照组的(2.18±0.28)s减少到(1.12±0.18)s,(0.75±0.14)s和(0.57±0.15)s。在麻醉豚鼠,静脉注射IL2.5mg.kg-1能够显著对抗结扎主动脉引起的50%和90%动作电位时程的缩短,从对照组水平的(94±7)ms和(112±8)ms延长至(114±8)ms和(128±8)ms;可减少触发活动的发生率,从对照组的(28.6±8.1)%减少到(6.5±4.6)%。结论:IL具有拮抗牵张性心律失常作用,这种作用可能是通过阻断牵张活化的离子通道实现。OBJECTIVE To study the antagonistic effects of isoliensinine (IL) on stretch-induced arrhythmia. METHODS The kinds of arrhythmia, shorting of action potential duration (APD) and triggered activity (TA) models were established by inflating the intracavitary balloon, clamping the ascending aorta. The recordings of electrocardiogram and monophasic action potentials (MAP) were used in vivo and in vitro. RESULTS (1,2. 5,5 μmol· L^- 1 ) could concentration-dependently reduce the persistent duration of stretch-induced arrhythmia in Langendorff heart from (2. 18 ± 0. 28) s as control to (1.12 ± 0. 18) s, (0. 75 ± 0. 14) s and (0. 57 ± 0. 15)s, respectively. In anesthetized guinea pigs, IL 2. 5 mg·kg^-1 intravenously could significantly counteract the shortening of 50% and 90% monophasic action potential duration (APD50 and APD90) evoked by clamping ascending aorta and decline the ratio of triggered activities (TA) from (94 ± 7)ms and (112 ± 8) ms as control to (114 ± 8) ms and (128 ± 8)ms, and from (28. 6 ± 8. 1 ) % to (6. 5 ± 4. 6) %. CONCLUSION IL possesses the antagonistic effects on stretchinduced arrhythmia,which may be related to blockade of stretch-activated ion channels.
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