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

包积液常显示QRS低电压或电交替现象；超声动图也可做出诊断。

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，意味着次提前的收缩。

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波通常与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，如果房结接受它，它将向下传导，正常的QRS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。

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”。

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

收缩以QRS复合波群的式展现，复极以及因此发生舒张的波，则视为T波。

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复合波变宽。

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

因此，QRS波群在V1开始时主要为负，在V6时以正性结束。

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 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.

在这例子中，每3QRS复合波有4P波。

Absence of P waves and presence of irregular narrow QRS complexes are the hallmark of atrial fibrillation.

无P波和不规则窄QRS波是房颤动的特征。

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，在单的律带上产生了不同式的QRS波群。

You will remember from section 1 that a Q wave exists if the first deflection of the QRS complex is negative.

大家可能记得第部分中，如果QRS波的第偏移是负的，Q波就存在。

The number of flutter waves preceding a QRS complex corresponds to number of atrial contractions to one ventricular contraction.

QRS波群前的房扑波的数目，相当于次收缩对应的房收缩的数目。

On an ECG, atrial fibrillation is characterized by absence of P-waves and irregular narrow QRS complexes.

在ECG上，房颤动的特征是没有P波和不规则的窄QRS波群。

The QRS complex represents depolarization of the ventricles which starts with the interventricular septum.

QRS波群代表从间隔开始的去极化。

On an ECG, this is seen as PROGRESSIVE prolongation of PR interval followed by a P wave WITHOUT a QRS complex.

在电图上，可见PR间期渐进性延长，随后是P波，无QRS复合波。

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，除极波向下传导左束支，然后异常地穿过，导致异常增宽的QRS波群。