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心肌细胞兴奋的特点是具有时相性或称周期性变化。此周期可分为绝对不应期与有效不应期,相对不应期,易颤期与超常期,在相对不应期开始较短的时间里,约当膜电位—60到—70毫伏之间,或心电图T波顶峰前30毫秒处,若给予较强刺激可导致颤动。因此时心肌纤维复极不均匀,有些纤维已恢复兴奋性,有些尚在不应期,因此容易发生
Myocardial cell excitability is characterized by phase or periodic changes. This cycle can be divided into the absolute refractory period and the effective refractory period, the relative refractory period, the Yi-quan period and the extraordinary period, in the relatively short period of time began refractory period, about the membrane potential -60 to -70 millivolts Or 30 ms before the peak of the T-wave of the electrocardiogram, a higher level of stimulation may result in chatter. Therefore, when the myocardial fibers repolarization uneven, some of the fibers have been restored excitability, and some still refractory period, so prone