The highlighted limb electrode is commonly used as the ground. Which label is it?
Answer choices
- ARA
- BLA
- CLL
- DRL
About this question
Which limb electrode is commonly used as the ground on a 12-lead EKG? CCMA cardiac monitoring items expect you to know RA, LA, LL, and RL placement, and that not every lead records a diagnostic vector the same way. Read the wording and clinical context closely; those details determine the NHA CCMA competency being tested.
This identification question asks which label is the usual ground. RL (right leg) is typically the ground or reference electrode; RA, LA, and LL form the Einthoven triangle for limb leads. Mixing up RL with RA is a common trap when reading diagrams. Remember: RL grounds; the other three limbs drive standard limb lead calculations. For ekg right leg rl ground electrode, link the concept to the patient-safety or workflow consequence that makes the rule matter.
Reveal answer & explanationShow
Correct answer
- ARA
- BLA
- CLL
- DRLCorrect
Basic rationale
RL (right leg) is typically the ground electrode in standard limb placement.
Option explanations
- A: RA is not the usual ground.
- B: LA is part of the Einthoven triangle.
- C: LL is an active limb lead.
- D: Correct. Right-leg ground electrode.
Deep Analysis
Core logic
RL is usually the grounding lead; RA, LA, and LL form the Einthoven triangle.
Distractor analysis
A: Incorrect because RA is an active limb lead in the triangle. B: Incorrect because LA is an active limb lead. C: Incorrect because LL is an active limb lead.
Exam trap
Ground is usually RL, not RA.
Memory tip
RL often equals ground.
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