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1.基本的心脏电生理: 正常的起搏点冲动是从窦房结发出,兴奋电流沿着心房、房室结和心室浦顷野纤维中的特殊自律纤维传播,各心腔的兴奋有规则地发生。当起搏点冲动到达心肌细胞时,通过其表面的膜系统迅速发生电兴奋。产生动作电位在心动周期的舒张期称为第4相,第4相去极化的能力称为自律性,是自律的或起搏点细胞的特性。心肌另一主要电生理性质是膜反应性。由0相锋形动作电位的最大上升速率所决定的传导速度,部分是依赖于兴奋一瞬间细胞内负电位的水平。
1. Basic Cardiac Electrophysiology: Normal pacemaker impulses are emitted from the sinoatrial node and the excitement current propagates along special acellular fibers in the atria, atrioventricular node, Happened. When the pacemaker reaches the cardiomyocytes impulsively, electrical excitation occurs rapidly through the membrane system on its surface. Produce action potentials in the cardiac cycle diastolic phase called the fourth phase depolarization capacity is called self-discipline, is self-paced or pacemaker cell characteristics. Another major electrophysiological property of myocardium is membrane reactivity. The conduction velocity, which is determined by the maximum rate of rise of the 0-phase frontal action potential, is in part dependent on the level of negative intracellular potential at the moment of excitement.