Question: where to place ecg leads?
Answer: To locate the space for V1; locate the sternal notch (Angle of Louis) at the second rib and feel down the sternal border until the fourth intercostal space is found. ... 
Next, V4 should be placed before V3. ... 
V3 is placed directly between V2 and V4.
V5 is placed directly between V4 and V6.