In this situation, the depolarization wave conducts down the left bundle branch and then through the ventricles aberrantly, resulting in an abnormally wide QRS complex.

这种情况下，除极波向下传导到左束支，然地穿过心室，导致一个增宽的QRS波群。

In severe cases, it can also cause a prolonged PR interval, a diminished or absent P wave, and a widened QRS complex.

情况严重时，甚至可出现PR间期延长、P波消失及QRS复合波变宽。

So if we get a more zoomed out look at the ECG, some of these P waves have a QRS complex right after them, and some don't and are followed by escape beats.

因此当我们对心电图整体观察的话，一些P波出现QRS波群，而一些没有，并可出现逸搏。

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：室性期前收是一种的心搏，起源于心室，心电图上表现出高而宽的QRS波群。

Also, the ST segment and T wave, which represent repolarization, will often be directed opposite the QRS complex.

同时，代表复极的ST段和T波通与QRS主波方向相反。

First, if the AV node is receptive, it gets conducted down to the ventricles, resulting in a normal QRS complex.

首先，如果房室结接受它，它将向下传导到心室，形成一个正的QRS波。

Alright, so let's say this heart's cruising along at about 60 bpm, which means that there's 1 second between p waves and QRS complexes.

现让我们假设这个心脏正60/分的心率循环搏动，这表示P波和QRS复合波之间有1秒钟。

For diagnosis, sometimes an electrocardiogram or ECG can be helpful, and people will often have low-amplitude signals, and smaller QRS complexes, due to restricted ventricular contraction.

对于诊断，有时心电图会很有用，病人通会有低峰信号，或者更小的QRS波，这是由于被限制的心室收。

On an ECG, we would see an increased distance or time between the P wave and the Q part of the QRS wave.

心电图上，我们会看到P波和QRS波Q部分之间的距离或时间增大。

Pericardial effusions typically lead to low QRS voltages or electrical alternans, and can be seen on an echocardiograph.

心包积液显示QRS低电压或电交替现象；超声心动图也可做出诊断。

People with WPW usually have a PR interval less than 120 ms, and a QRS complex greater than 110 ms.

WPW患者的PR间期小于120ms，QRS波大于110ms。

Thus, the QRS complex starts as predominantly negative in V1, and ends as predominantly positive in V6.

因此，QRS波群V1开始时主要为负，V6时正性结束。

You just had 5 mLs. House: The QRS is getting wider.

护士: 你刚刚吸了5毫升。豪斯: QRS越来越宽了。

The QRS wave, which is sometimes called the QRS complex, represents the spread of the electrical impulse through the ventricles, or ventricular depolarization.

QRS波，有时被称为QRS波群，代表电脉冲通过心室的传播，或心室去极化。

The QRS axis is the most important, and also the easiest to be determined, as it represents ventricular depolarization.

QRS轴是最重要的，也是最容易确定的，因为它代表心室去极化。

The reason for this increased distance or time is because the P wave represents contraction of the atria and the QRS wave represents contraction of the ventricles.

距离或时间增加的原因是P波代表心房收，QRS波代表心室收。

In contrast, if infarction occurs under leads in which the QRS complex ends with an S wave, the S wave may disappear.

相反，如果梗死发生QRS波S波结束的导联下，S波可能消失。

On an electrocardiogram, the P-wave corresponds to atrial contraction, the PR interval corresponds to the slight delay through the AV node, and the QRS complex is ventricular contraction.

心电图里，P波表示心房收，PR间期表示房室结的延搁，QRS波代表心室的收。

Peaked T-waves, ST segment elevation, and alterations to the terminal portion of the QRS complex are the early changes of acute myocardial infarction secondary to complete occlusion of a coronary arterial vessel.

T波尖峰，ST 段抬高，及QRS波群终末部分改变，均是继发于冠状动脉血管完全堵塞的急性心肌梗死的早期改变。

A normal ECG has three distinct waves, and we call them the P wave, QRS wave, and the T wave, and you notice that they follow in alphabetical order.

正的心电图有三种不同的波，我们称之为P波、QRS波和T波，你注意到它们是按字母顺序排列的。