1. Electrode Positions for 3- (Left) and 5-Lead (Right) Systems

Positions for the 3-lead system:

• RA (white electrode) below right clavicle, second ICS, right midclavicular line
• LA (black electrode) below left clavicle, second ICS, left midclavicular line
• LL (red electrode) left lower rib cage, eighth ICS, left midclavicular line

Positions for the 5-lead system:

• RA (white electrode) below right clavicle, second ICS, right midclavicular line
• RL (green electrode) right lower rib cage, eighth ICS, right midclavicular line
• LA (black electrode) below left clavicle, second ICS, left midclavicular line
• LL (red electrode) left lower rib cage, eighth ICS, left midclavicular line
• Chest (brown electrode) any V lead position, usually V₁ (fourth ICS, right sternal border)