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双苯氟嗪对异丙肾上腺素诱发人心房肌纤维迟后除极和触发活动的影响(英文) 被引量:2

Effect of dipfluzine on delayed afterdepolarizations and triggered activity induced by isoprenaline in human atrial fibers
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摘要 目的研究双苯氟嗪(D ip)对异丙肾上腺素诱发人心房肌纤维迟后除极(DAD s)和触发活动(TA)的影响。方法应用异丙肾上腺素诱发稳定且可重复的迟后除极和触发活动。用细胞内玻璃微电极技术记录DAD s和TA诸参数。结果预先应用D ip(3μmol.L-1)或乙醇溶剂(3 mL.L-1)对异丙肾上腺素引起的DAD s和TA无明显影响;D ip(10μmol.L-1)使DAD s的幅度从(13.3±2.3)mV降低到(4.0±1.0)mV,但对DAD s和TA的发生率无显著影响;D ip(30μmol.L-1)则能抑制DAD s和TA的发生。结论D ip对异丙肾上腺素诱发的人心房肌纤维DAD s和TA有抑制作用,这可能与其抑制L-型钙通道和/或肌浆网钙释放从而减轻细胞内钙超载有关,并可能由此产生抗心律失常作用。 Delayed afterdepolarizations ( DADs ) are oscillations of membrane potential and occur after complete repolarization of the cardiac action potential, which can cause triggered activity (TA) and cardiac arrhythmias . Dipfluzine (Dip), a novel calcium antagonist with similar structure to flunarizine (Flu) . can decrease overshoot, action potential amplitude (APA), maximal rate of depolarization in phase 0 ( Vmax ), shorten duration of plateau ( PPD ) , and duration of 50% and 90% repolarization of action potential (APD50, APD90) in partially depolarized guinea pig papillary muscles,
出处 《药学学报》 CAS CSCD 北大核心 2006年第2期184-187,共4页 Acta Pharmaceutica Sinica
关键词 双苯氟嗪 异丙肾上腺素 人心房肌纤维 微电极 电生理 dipfluzine isoprenaline human atrial fibers microelectrodes electrophysiology
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