The electrodes The ECG is recorded by applying electrodes to the limbs and to different parts of the praecordium. There are four limb and usually six chest electrodes (V1-V6). Occasionally additional chest electrodes are used to obtain more information regarding the right ventricle and posterior aspects of the heart. The position of the commonly used electrodes is given in Table 1. These positions are standardized and are shown in (1) and (2). These electrodes are used to generate the leads.