Ectopic beats can also have " triggered activity" which is where cells depolarize early.

异位心搏也有“激发活动”，即在细胞提前除极的位置。

So the sinus node waits the same interval but fires based on the ectopic beat.

接下来窦房结又等待了同样的间隔时间，该时间内传导的冲动是基于异位心搏发出的。

So, what you end up with, is this interval with two sinus beats and an ectopic beat in the middle and this is less than that if it had been three sinus beat in row.

所以结果形成了一个两次分开的窦性心搏加上中间异位心搏的间隔，并且它比连续三次窦性心搏的时间要短。

Next, the ectopic beat could happen during the PR segment, and because the ectopic depolarization happens relatively slowly, oftentimes, it will combine with the normal depolarization wave coming down the ventricular conduction system, resulting in a ventricular fusion beat.

其次，异位心搏可能发生在PR间期，因为异位去极化相对缓慢，它常会和在心室传导系统中下行的正常除极波融合，导致室性融合心搏。