EKG certification Certification EKG Electrode Placement & Lead Systems 2

Question 1

When performing a 12-lead EKG, where should the V4 electrode be placed?

Accepted Answer

Fifth intercostal space, midclavicular line

Answer

Fourth intercostal space, left sternal border

Answer

Fifth intercostal space, left midaxillary line

Answer

Fifth intercostal space, left anterior axillary line

Question 2

Which leads are considered the inferior leads on a 12-lead EKG?

Accepted Answer

II, III, and aVF

Answer

I, aVL, and V5

Answer

V1, V2, and V3

Answer

aVR, aVL, and aVF

Question 3

What is the correct limb electrode placement for a standard 12-lead EKG?

Accepted Answer

RA on right arm, LA on left arm, RL on right leg, LL on left leg

Answer

RA on right leg, LA on left arm, RL on right arm, LL on left leg

Answer

RA on right arm, LA on left leg, RL on right leg, LL on left arm

Answer

RA on left arm, LA on right arm, RL on left leg, LL on right leg

Question 4

Lead aVR provides an electrical view of the heart from which perspective?

Accepted Answer

Right shoulder toward the heart

Answer

Left lateral wall

Answer

Inferior wall

Answer

Posterior wall

Question 5

If the V1 and V2 electrodes are placed too high on the chest, what is the most likely effect on the EKG tracing?

Accepted Answer

Altered R-wave progression mimicking septal pathology

Answer

Increased amplitude of P waves in all leads

Answer

Baseline artifact from skeletal muscle

Answer

Prolonged QT interval across precordial leads

Question 6

In Einthoven's triangle, Lead I measures the potential difference between which two electrodes?

Accepted Answer

Left arm (positive) and right arm (negative)

Answer

Right arm (positive) and left leg (negative)

Answer

Left leg (positive) and right arm (negative)

Answer

Left arm (positive) and left leg (negative)