Sensor and Lead Placement and Marking Codes

- Sensor and Lead Placement and Marking Codes Leads Placement Abbreviation Marking Code Limb Leads Lead | ‘ Right arm to left arm RA-LA ‘ 0 Lead H ‘ Right arm to left leg RA-LL '- Lead lll l Left arm to left leg LA-LL ‘ «- Augmented Leads AVR l RA-midpoint (LA-LL) (LA-LL) RA — AVL l LA-midpoint (RA-LL) (RA-LL) LA -- AVF ‘ LL-midpoint (RA-LA) (RA-LA) LL --- Chest Leads V1 l 4th intercostal space, right sternal border ‘ #0 V2 ‘ 4th intercostal space, left sternal border 7.. V3 ‘ Midway between V2 and V4 —--- V4 l 5th intercostal space, midclavicular left —---- V5 l Left anterior axillary fold, horizontal to V4 ‘ V6 1 Left midaxillary, horizontal to V4 and V5