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心脏跳动的速率和节律改变叫心律失常。不用“心律紊乱”或“心律不齐”这两个名称,因为有些心律失常的心律是规则的。心律失常的基本知识(一)心肌的生理特性1.兴奋性(应激性):指心肌接受刺激发生收缩反应的特性。当任何一个刺激达到心肌的刺激阈时,该部心肌就发生反应,先有电活动,然后引起心肌收缩。2.反拗性(不应性):指心肌正在收缩时,对外来刺激不起反应的特性。这有很大生理意义,如果没有这种特性,心肌将持续地强直收缩。
The rate of heart beating and the rhythm change are called arrhythmias. No “heart rhythm disorder” or “arrhythmia” these two names, because some arrhythmia rhythm is regular. The basic knowledge of arrhythmia (a) the physiological characteristics of the heart 1. Excitability (stress): refers to the characteristics of cardiac contractile response to stimulation. When any one of the stimuli reaches the stimulating threshold of the myocardium, the myocardium reacts, first with electrical activity and then with myocardial contractions. 2. Anti-offensive (not sexual): refers to the contraction of the heart muscle, external stimuli can not afford to respond to the characteristics. This is of great physiological significance, and without it, the myocardium will continue to contract ankylosis.