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

心包积液常显示QRS低电压或电交替现象；超声心动图也可做出诊断。

Now - in both these situations, the QRS complex comes in early, which means an early ventricular contraction.

现在，在这两种情况下，QRS波群都会提前出现，意味着一次提前的心收缩。

In majority of cases, the successfully conducted QRS complexes may appear broader than usual.

大多数情况下，成功传导的QRS波群可能较正常宽。

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

首先，结接受它，它将向下传导到心，形成一个正常的QRS波。

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

同时，极的ST段和T波通常与QRS主波方向相反。

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，甚至可以出现PR间期延长、P波消失以及QRS合波变宽。

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。

In some type II blocks, there is a fixed number of P waves per QRS complex.

在某些II型传导阻滞中，每个QRS波群有固定数目的P波。

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间期常常小于120ms，QRS波大于110ms。

The ventricular contraction is seen as a QRS complex, and the ventricular repolarization, and therefore it's relaxation, is seen as a T-wave.

心收缩以QRS合波群的形式展现，心极以及因此发生舒张的波形，则视为T波。

On an ECG V-tach is characterized by wide and bizarre looking QRS complexes.

在ECG上，V-tach的特征是宽而异常的QRS波群。

Also, you might have multiple ectopic foci PVCs, producing different appearing QRS complexes on a single rhythm strip.

同样，你可能有许多性期前收缩的异位起搏点，在单一的心律带上产生了不同形式的QRS波群。

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.

现在让我们假设这个心脏正在以60次/分的心率循环搏动，这示P波和QRS合波之间有1秒钟。

This is known as a " blocked" P wave or a " dropped" QRS complex.

这就是所谓的P波“被阻滞”或QRS波群“脱落”。

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.

在这种情况下，除极波向下传导到左束支，然后异常地穿过心，导致一个异常增宽的QRS波群。

The number of QRS complexes always equals the number of P waves MINUS one.

QRS波的数目总是等于P波数目-1。

In this example, there are four P waves for every three QRS complexes.

在这个例子中，每3个QRS合波有4个P波。

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，电脉冲通过心的传播，或心去极化。

As an example, consider how the 6 chest leads - V1 through V6 - register this depolarization wave form called the QRS complex.

作为例子，我们来看一下这6个胸导联，V1-V6是怎样来记录被称为“QRS波群”的除极波形的。

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

在心电图上，我们会看到P波和QRS波Q部分之间的距离或时间增大。