thaler chapter 1

The 12 Views of the Heart

Just like the limb leads, each precordial lead has its own particular

line of sight and region of the heart that it views best.

V1 V2

Note that the right ventricle lies anteriorly and medially within

the body cavity, and the left ventricle lies posteriorly and laterally.

Lead V1 lies directly over the right ventricle, V2 and V3 over the

interventricular septum, V4 over the apex of the left ventricle, and V5

and V6 over the lateral left ventricle.

Leads V2 through V4 are often referred to as the

anterior leads

, V5

and V6 join I and aVL as

left lateral leads

, and leads aVR and V1 are

the

right ventricular leads

Leads

Group

V2, V3, V4

I, aVL, V5, V6

Left lateral

II, III, aVF

Inferior

aVR, V1

Right ventricular