These are collectively called the chest leads.

其相关心电图统称为“胸导联”。

There are 6 limb leads and 6 chest leads.

有6个肢体导联和6个胸导联。

The chest leads, or precordial leads, view the heart in a HORIZONTAL plane.

胸导联或心前导联在水平面监测心脏。

Now, all the limb leads and chest leads can be grouped based on the regions of the heart that they are nearest.

所有的肢体导联和胸导联可以根据它们距离心脏最近的区域来进行分组。

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。

Non-progression or poor progression of R wave - R wave stays low and S wave remains deep throughout all chest leads.

R波无进展或进展不良-所有胸导联R波持续较低，S波仍较深。

The reference negative value is the same for all chest leads and is calculated as the average of inputs from the three limb electrodes.

所有胸导联的参考负值相同，等于三个肢体电极输入的平均值。

Left untreated, these spasms become more extreme, eventually seizing the muscles in the windpipe and chest, leading patients to suffocate within 72 hours of symptoms appearing.

如果不及时治疗， 这些痉挛会变得更加严重，最终导致气管和胸部肌肉痉挛，导致患者在症状出现后 72 小时内窒息。

Elevation of more than two small squares in the chest leads or one small square in the limb leads, indicates the possibility of myocardial infarction.

胸导联＞2个小方格抬高或肢体导联＞1个小方格抬高，提示可能心肌梗死。

So, in total you've got 6 leads from the limb leads, 6 from the chest leads, leading to a grand total of 12, which gives you your 12-lead ECG.

所以，我们有6个肢体导联，加上6个胸导联，总共12个导联，这就是我们的“12导联心电图”。

Leads I and aVL, along with two of the chest leads, V5 and V6, are all considered " lateral" leads and they're near the lateral wall of the heart which receives blood from the left circumflex artery.

I、aVL以及V5和V6导联，被认为是“侧壁导联”，因为它们靠近心脏的侧壁，这里接受左旋支动脉的血液供应。