Question

If you see interference on Leads 2 & 3, which sensor/electrode would you check?

A) Right Arm (RA)
B) Left Leg (LL)
C) Right Leg (RL)
D) Left Arm (LA)

Answer 1

To address interference on Leads 2 & 3, check the Left Leg (LL) electrode as it's the common sensor used in both measurements, indicating it could be the source of the problem.

Step-by-step explanation:

If you see interference on Leads 2 & 3, the sensor/electrode you would check is B) Left Leg (LL). This is because the Lead II measures the electrical potential between the right arm (RA) and the left leg (LL), and Lead III measures between the left arm (LA) and the left leg (LL). If there is interference on both these leads, it suggests the common electrode in both measurements, which is the left leg (LL), might be the source of the problem.