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