ECG ECG Lead Placement and Technique 3 — Questions and Answers
Question 1: In the standard limb lead system, where is the RA (right arm) electrode placed?
- Right wrist or right forearm (Correct answer)
- Right upper chest
- Right ankle
- Right shoulder blade
Correct answer: Right wrist or right forearm
The RA electrode is placed on the right arm, typically the wrist or forearm.
Question 2: Which limb electrode is the neutral or ground lead?
- Right arm (RA)
- Left arm (LA)
- Right leg (RL) (Correct answer)
- Left leg (LL)
Correct answer: Right leg (RL)
The right leg (RL) electrode serves as the ground/neutral reference.
Question 3: What color is the LA (left arm) electrode in the American (AHA) color code?
- White
- Black (Correct answer)
- Green
- Red
Correct answer: Black
In the AHA system, the left arm electrode is black.
Question 4: Under the AHA color code, the RA electrode is:
- Black
- Green
- Red
- White (Correct answer)
Correct answer: White
The right arm electrode is white in the AHA color scheme.
Question 5: The LL (left leg) electrode color in the AHA system is:
- Red (Correct answer)
- Green
- White
- Black
Correct answer: Red
The left leg electrode is red in the AHA color code.
Question 6: Why should limb electrodes be placed on fleshy areas rather than over bone?
- To improve wireless signal
- To reduce artifact and improve conduction (Correct answer)
- To speed up the test
- It has no effect on quality
Correct answer: To reduce artifact and improve conduction
Fleshy sites improve electrical contact and reduce motion and bone-related artifact.
Question 7: In the AHA color code, the RL (right leg) electrode is:
- Green (Correct answer)
- Red
- White
- Black
Correct answer: Green
The right leg ground electrode is green in the AHA scheme.
ECG ECG Lead Placement and Technique 3
In the standard limb lead system, where is the RA (right arm) electrode placed?