ECG leads | DOWN (-) | Heart parts along the lead path | UP (+) | |||
---|---|---|---|---|---|---|
Bipolar Einthowen leads | I. | Right arm | Right ventricle wall | Septum | Left ventricle wall | Left arm |
II | Atria | Septum and walls | Apex | Left foot | ||
III | Left arm | |||||
Unipolar leads from extremities | aVL | Between right arm & left foot | Right ventricle wall | Septum | Left ventricle wall | Left arm |
aVR | Between left arm & left foot | Left ventricle wall | Septum | Atria | Right arm | |
aVF | Zpper thoracic aperture, nuchal area | Atria | Septum and walls | Apex | Left foot | |
Precordial chest leads | V1-2 | Central terminal | Deep heart structures | Septum | Atria | Positions on the chest front |
V3-4 | Anteroseptal | |||||
V5-6 | Left ventricle wall | |||||
Bipolar triaxiall leads | X | R thoracic wall | Right ventricle wall | Septum | Left ventricle wall | L thoracic wall |
Y | Upper thoracic aperture, nuchal area | Atria | Septum and walls | Apex | Left foot | |
Z | Sternal thoracic wall | Ventricle wall | Septum | Ventricle wall | Dorzal thoracic wall |