Question

If you see interference on leads 3 & AVL, which sensor/electrode would you check?

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

Answer 1

If you see interference on leads 3 & AVL, you should check the Left Leg (LL) sensor/electrode.

Step-by-step explanation:

If you see interference on leads 3 & AVL, you should check the Left Leg (LL) sensor/electrode. In an ECG, the leads are used to measure the electrical activity of the heart from different angles. Lead III is formed by connecting the Left Arm (LA) electrode to the Left Leg (LL) electrode. If there is interference on leads 3 & AVL, it suggests a problem with the LL electrode, and checking its connection or positioning can help resolve the issue.