So, cardiac cycle, I've written about the phases, intrinsic regulation.

关于心动周期，我写过关于阶段和内在调节的文章。

For example, ventricular bigeminy is when a premature ventricular contraction consistently comes after each normal cardiac cycle.

比如，室性二联律就是室性期前收缩在每个正常心动周期之后持续发生。

Ventricular trigeminy, on the other hand, is when one consistently comes after every two normal cardiac cycles.

而室性三联律，就是一次室性期前收缩持续发生于每两个正常心动周期之后。

A ventricular ectopic focus can fire at different points in the cardiac cycle, which we can look at using the ECG.

室性异位起搏点会在心动周期的不同时间点放电，我们可以用心电图监测到。

Mean arterial pressure is defined as the average arterial blood pressure during a single cardiac cycle.

平均动脉压定义为单个心动周期内的平均动脉血压。

The average arterial blood pressure during a single cardiac cycle is called the mean arterial pressure (MAP).

单个心动周期中的平均动脉血压称为平均动脉压（MAP）。

Each wave or segment of the ECG corresponds to a certain event of the cardiac electrical cycle.

心电图的每一个波或段对应于心脏电周期的某个事件。

The graphs show the heart's OVERALL electrical potential, or voltage, as it changes over time during a cardiac cycle.

这些图形显示了心脏在一个心动周期内随时间变化的总电势或电压。

What I just described is one cardiac cycle, or the sequence of events in a single heartbeat.

我刚刚描述的是一个心动周期，或单次心跳中的一系列事件。

This diastole-systole cardiac cycle (relaxation-filling, then contraction-pumping) lasts about 0.9 second and occurs between 70 and 80 times per minute.

这就是说，心室泵血入动脉通常每分钟70－80次。