论文部分内容阅读
心脏窦房结的自律性起搏细胞的电生理特征与普通心肌细胞截然不同,有起搏功能的细胞在一次动作电位结束后,其跨膜动作电位并不停止在静息膜电位水平,而是发生逐渐的舒张期自动化极化,当跨膜电位达到阈值时将形成一次新的除极。最新研究结果证实,这是起搏I_f电流作用的结果。[定义]I_f中的f是funny的缩写,意指与其他跨心肌细胞膜的4种离子流(Na+、Ca2+、K+、Cl-)均不同。If
Cardiac sinus node electrophysiological characteristics of paced cells and ordinary cardiomyocytes completely different pacing function of cells in an action potential after the end of the trans-membrane action potential does not stop at resting membrane potential level, and Is a gradual diastolic automated polarization that creates a new depolarization when the transmembrane potential reaches a threshold. The latest research results confirmed that this is the result of pacing I_f current effect. [Definition] f in I_f is an acronym for funny, meaning that it is different from the other four ion fluxes (Na +, Ca2 +, K +, Cl-) that cross the myocardial cell membrane. If