One of the six standard electrocardiogram (EKG or ECG) leads or electrodes.
The six precordial leads are placed on the anterior chest in a standard configuration. V1 is placed on the right side of the sternum at the fourth intercostal, or rib space, while V2 is placed directly across the sternum on the left side of the chest. As shown above, the precordial leads are placed on the anterior chest in the following manner: 1  V1 - is placed on the fourth intercostal space at the right sternal border. 2  V2 - is placed on the fourth intercostal space at the left sternal border. 3  V3 - is placed halfway between V2 and V4. Read More. Since we covered the first 6 leads of the 12 lead ECG in the 6-part tutorial on axis determination, a few words about the precordial leads might be in order. These are leads V1-V6, the unipolar leads that are placed directly on the patient’s chest. The heart is a 3 dimensional object, and calculating the […]. A precordial lead refers to one of the six standard electrocardiogram (EKG or ECG) leads, or electrodes, placed on the chest in order to obtain a 12-lead EKG report graphically showing the heart's electrical activity. The initial negative deflections in leads ll, lll, and aVF are not Q waves of an infarction but negative delta waves. In ventricular pre-excitation, the delta waves can be upright in some leads, inverted in other leads, or even isoelectric in other leads. The precordial leads are also classified based on the region of the heart they are monitoring: 1  V1 and V2 are called the septal leads. 2  Electrical activity of the inter-ventricular septum is best measured in these leads. 3  V3 and V4 are called the anterior leads. The precordial leads, designated as leads V1, V2, V3, V4, V5, and V6, are placed at different angles in specific regions of the chest to register cardiac electrical activity in the horizontal plane and to reveal valuable information about specific regions of the heart.
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