ECG Limb Lead Placements

Question 1

How many electrodes are attached to the patient for a 12-lead ECG?

Answer 1

10

6 precordial (chest) electrodes and 4 limb electrodes

Question 2

What is the location of V1 electrode?

Answer 2

4th intercostal space, right sternal margin

Question 3

What is the location of V2 electrode?

Answer 3

4th intercostal space, left sternal margin

Question 4

Where is the V3 electrode placed?

Answer 4

Midway between V2 and V4

Question 5

What is the location of V4 electrode?

Answer 5

5th intercostal space, mid-clavicular line

Question 6

Where is the V5 electrode located?

Answer 6

5th intercostal space, anterior axillary line (at the same level as V4)

Question 7

What is the placement of V6 electrode?

Answer 7

5th intercostal space, mid-axillary line (at the same level as V4)

Question 8

What are the limb leads in a 12-lead ECG?

Answer 8

• RA: right arm or hand
• LA: left arm or hand
• RL: right leg or foot
• LL: left leg or foot

Question 9

Which electrodes should be applied first for easier placement?

Answer 9

V1, V2, and V4

Question 10

What colors are used for limb lead placement?

Answer 10

• RA: red
• LA: yellow (‘lemon’)
• LL or ‘F’: green
• RL or ‘N’: black

Question 11

What should be done for an accurate ECG?

Answer 11

Double check lead placement and ask the patient to keep extremely still for 30 seconds.