3)ECG Lead placement (Fig.1-6 and Fig.1-7) A beginners guide to place ECG leads 心电图导联的放置（图1-6和图1-7）初学者的心电图导联放置导引

The peripheral limb electrode clips are correctly connected with wrists and ankles as Fig. 1-6:

Red clip is connected with right wrist.

Yellow clip is connected with left wrist.

Green clip is connected with left leg.

Black clip is connected with right leg.

Memory tips:

Clockwise sequence: red-yellow-green-black

外围的肢体电极夹子连接于手腕和脚踝上（图1-6）：

红色夹子接右手

黄色夹子接左手

绿色夹子接左腿

黑色夹子接右腿

记忆方法：

顺时针顺序简称：红-黄-绿-黑

V1: right 4th intercostal space

胸骨右缘第四肋间

V2: left 4th intercostal space

胸骨左缘第四肋间

V3: midpoint between V2 and V4 lead

V2～V4导联连线的中点

V4: left 5th intercostal space, along midclavicular line

左锁骨中线第5肋间

V5: horizontal to V4, left anterior axillary line

左腋前线，同V4水平

V6: horizontal to V4, left mid-axillary line

左腋中线，同V4水平

The ECG can identify electrical activity in any direction of the heart. Generally, ten electrodes are placed on the skin of the limbs and the chest separately to record heart electrical activity in different directions. The electrode attached to the right leg is treated as an earth wire and does not contribute to any lead. It is named as 12-lead ECG because it records the electrical activities of the heart from 12 different angles, including six obtained from the “limb” leads (Ⅰ , Ⅱ , Ⅲ , aVR,aVL, aVF) and six from the “chest” leads (V1-V6).

心电图可以识别心脏任何方向的电活动。通常来说，10个电极被分别放置在肢体和胸壁皮肤，用来记录不同方向的心脏电活动。右腿电极被作为地线，不构成任何导联。因为其可以从12个不同的角度来记录心电活动，所以称之为标准12导联心电图。一般包括6个肢体导联(Ⅰ、Ⅱ、Ⅲ、aVR、aVL、aVF)，以及6个胸导联(V1～V6)。

12 Leads System (Tab.1-2, Fig.1-8 and Fig.1-9) 十二导联系统（表1-2，图1-8和图1-9）

A: Standard limb leads (Ⅰ , Ⅱ , Ⅲ )

标准肢体导联（Ⅰ、Ⅱ、Ⅲ）

B: Augmented limb leads (aVR, aVL, aVF)

加压肢体导联（aVR、aVL、aVF）

C: Chest leads (V1-V6)

胸导联（V1～V6）