论文部分内容阅读
钙离子(Ca~(++))参与几乎整个心血管系统细胞功能的调节,它促发的兴奋—收缩偶联支配着心肌的收缩力和血管平滑肌的紧张度。此种调节或偶联一旦失常,便会导致心血管疾病。这是近年来伴随着钙通道的逐步阐明而不断深化的认识。正是基于这些认识,临床上使用钙通道诱导剂(Calcium-Entry Inductors,CEI)与钙通道阻滞剂(Calcium-Entry Blockers,CEB)的被动性甚或盲目性正被主动性以及预期性所取代。一、钙通道细胞膜上的离子通道都是一种容纳在胞膜双层脂类基质内的特殊蛋白,它有一个充满水的中央孔,以利离子通过。此孔外接胞膜外表面的通道外口,内与胞膜内表面的一个中心激活(A,m 或d)闸门和一个备用(I,h 或f)闸门相连。根据离子通过时动作电位的速率,离子通道可分为快通道与慢通道二大类。同快通道相比,慢通道在动力学上显得较为迟缓,即它们的闸门开放、关闭和复原更慢。此外,慢通道闸门可在负值较小的电压范围内工作,
Calcium (Ca ~ (++)) is involved in the regulation of cellular functions throughout almost the entire cardiovascular system, and its stimulatory-contractile coupling governs myocardial contractility and vascular smooth muscle tone. Once this regulation or coupling disorders, can lead to cardiovascular disease. This is an understanding that has been deepening with the gradual clarification of calcium channels in recent years. It is on this basis that the passive or even blindness of clinically using Calcium-Entry Inductors (CEIs) and Calcium-Entry Blockers (CEBs) is being replaced by initiatives and expectations . First, the calcium channel ion channels on the cell membrane are a special protein contained in the bilayer lipid matrix, it has a central hole filled with water to facilitate ion passage. This orifice is external to the outer channel of the outer membrane of the membrane and is connected to a central activation (A, m or d) of the inner membrane and to a spare (I, h or f) gate. According to the rate of action potential when the ions pass ion channels can be divided into two categories of fast and slow channel. Slow channels appear to be more sluggish in kinetics than fast channels, ie their gates are open, closed and recover more slowly. In addition, the slow channel gate can work in the smaller negative voltage range,