'P waves' or primary waves are the first waves that arrive.

" P波" 或" 主波" 是第一批可以感受到的地震波。

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。

This is called a noncompensatory pause, where the sinus P wave to the ectopic P wave to the next sinus P wave is less than the sinus P wave to sinus P wave to sinus P wave.

这被称为非代偿间歇，窦性P波到异位P波，再到下一个窦性P波，要比窦性P波到窦性P波再到窦性P波的时间短。

P wave is just a pure pressure wave.

P波只是一种纯粹的压力波。

So he actually got to feel the warning of the P waves.

所以他真的感受到了P波的警告。

Also, the closer the ectopic focus is to the AV node, the shorter the PR interval, which is the time from the P wave to the QRS complex.

并且，异位起搏点越靠近房室结，PR间期就越短，也就是P波到QRS复合波群的时间。

Unusual morphology of P waves is indicative of atrial enlargement.

P波形态异常提示心房扩大。

But leaving a building during an earthquake, especially after the P waves hit, is risky too.

但是在地震期间离开建筑物，尤其是在 P 波袭击之后，也是有风险的。

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复合波有4个P波。

This results in a P wave that is taller than normal, more than 2.5 small squares.

这将导致P波较正常高，＞2。5个小方格。

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”。

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，这表示P波和QRS复合波之间有1秒钟。

And researchers found that P waves travel through both liquids and solids, while S waves travel only through solid matter.

同时研究人员发现P波能穿行液体和固体两种，而s波只能穿行固体物质。

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。

The P wave represents the spread of the electrical impulse through the atria, and this is referred to as atrial depolarization.

P波代表电脉冲通过心房的传播，这被称为心房去极化。

On an ECG atrial flutter is characterized by absence of normal P wave.

在ECG上，心房扑动的特征是没有正常的P波。

You see, these studies revealed that these vibrations were of two types: compression or P waves and shear or S waves.

你看，这些研究显示这些震动是两种类型：涨缩波或者说P波和畸变波或者说S波。

This is represented by the P wave on the ECG.

这由心电图上的P波表示。

P waves are fast, compressive waves that push and pull the ground in the same direction as the wave, causing little noticeable ground movement.

P 波是快速的压缩波，它会在与波相同的方向上推动和拉动地面，几乎不会引起明显的地面运动。