Premature ventricular contractions are early beats that arise from the lower chambers of the heart.

室性早搏是指从心脏下心室产生的早搏。

This is what leads to a premature ventricular contraction, or PVC.

这就导致了一次室性期前收缩，或者说PVC。

Sometimes premature ventricular contractions can keep happening rather than being isolated events.

有时室性期前收缩会持续发生，而不是孤立事件。

Then there's the other kind of irregular heartbeat: Premature ventricular contractions are early beats that arise from the lower chambers of the heart.

还有另一种不规则的心跳: 室性期前收缩是由心脏下腔(左右心室)引起的早期心跳。

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。

They were measuring two things: the number of what are called premature atrial contractions and premature ventricular contractions.

房性早搏和室性早搏的数量。

Alright, as a quick recap - Premature ventricular contractions are abnormal heartbeats that originate in the ventricles, and show up as tall and wide QRS complexes on an ECG.

好，作一个小结：室性期前收缩是一种异常的心搏，起源于心室，在心电图上表现出高而宽的QRS波群。

Regardless of the originating ventricle, a premature ventricular contraction often has an abnormal T wave since the timing and direction of repolarization will be abnormal as well.

不论起源心室是哪个，室性期前收缩由于去极化的时程和方向也会异常，而经常有一个异常的T波。

Now, most people with premature ventricular contractions don't notice them, but if they keep occurring they can cause lightheadedness because of less blood getting delivered to the brain.

好，大部分有室性期前收缩的人不会注意到它们，但是如果他们持续发生，会导致头晕，因为被输送到脑部的血液变少。

Typically, premature ventricular contractions don't need treatment, and if there is an obvious cause like a medication or use of a substance, then stopping that typically resolves the issue.

通常，室性期前收缩不需要治疗，如果有显着的病因，如药物治疗或药物或酒精滥用，那么停用就通常能解决问题。

If the premature ventricular contractions keep happening or cause palpitations, they can be treated with beta blockers or calcium channel blockers, both of which prevent the heart from beating too strongly.

如果室性期前收缩持续发生或导致心悸，他们可能用beta受体阻滞剂或者钙离子通道阻滞剂治疗，这两种都能防止心脏过于强力地搏动。

The diagnosis of a premature ventricular contraction is based on the ECG, but sometimes a Holter monitor - which is like a continuous ECG monitor used over a few days - is needed to capture the event.

室性期前收缩的诊断基于心电图，但有时动态心电监护仪（在几天内持续用心电图检测）被用来捕捉这个事件。