【正文】
1 Cardiovascular System Overview Pharmacological treatment of cardiovascular dysfunction is directed at pathologies affecting rhythm, cardiac contractile performance, blood vessel function, or blood pressure regulation. 2 Cardiac electrophysiology The electrical activity of each excitable cardiac cell can be measured as periodic changes in the electrical potential difference between the inside and outside of the cell. The polarity, amplitude, and pattern of change of this potential difference are determined by the transport of ions through highly regulated membrane proteins that form a variety of transporters and channels. Both passive and active transport mechanisms are involved. 3 心肌細(xì)胞膜電位離子基礎(chǔ) 0期:去極 快 Na內(nèi)流 1期:快速?gòu)?fù)極化期: K+ 外流 2期:緩慢復(fù)極化期(平臺(tái)期): Ca2+內(nèi)流, K+ 外流 3期:快速?gòu)?fù)極化末期: K+ 外流 4期:靜息期:排 Na+ 、 Ca2+,回?cái)z K+ 第 18章 作用于心血管系統(tǒng)離子通道的藥物 5 第一節(jié) .心血管系統(tǒng)離子通道 一 .離子通道研究簡(jiǎn)史 電壓鉗:直接測(cè)定膜電流并分析電流的離子成分 Hodgkin amp。 keens,1963Nobel Prize 膜片鉗:記錄膜離子單通道電流,可用于直徑較小細(xì)胞 Neheramp。Sakmann,1991Nobel Prize 6 離子通道 (ion channel ): 是細(xì)胞膜上的一種特殊整合蛋白,對(duì)某些離子能選擇通透,是細(xì)胞生物電活動(dòng)的基礎(chǔ)。 研究離子通道的意義: 研究膜離子通道的通透機(jī)制及各種藥物選擇性作用于藥物的機(jī)制,對(duì)闡明: ?細(xì)胞生物電現(xiàn)象 (心電、腦電、肌電、