EKG certification Certification EKG Electrode Placement & Lead Systems 3

Question 1

Which precordial lead is positioned at the fourth intercostal space to the right of the sternum?

Accepted Answer

V1

Answer

V2

Answer

V3

Answer

V4

Question 2

What do leads V7, V8, and V9 evaluate when added to a standard 12-lead EKG?

Accepted Answer

Posterior wall of the left ventricle

Answer

Right ventricular free wall

Answer

Left atrial appendage

Answer

Superior vena cava region

Question 3

A technician notices lead III has an inverted P wave and upright QRS. Which electrode misplacement is most likely?

Accepted Answer

Right arm and left arm electrodes are reversed

Answer

Right leg and left leg electrodes are reversed

Answer

V1 and V2 electrodes are swapped

Answer

Left arm and left leg electrodes are reversed

Question 4

Which group of leads represents the lateral wall of the left ventricle?

Accepted Answer

I, aVL, V5, and V6

Answer

II, III, and aVF

Answer

V1, V2, V3, and V4

Answer

aVR, V1, and V2

Question 5

Where should right-sided chest leads (V3R-V6R) be placed to evaluate a suspected right ventricular infarction?

Accepted Answer

Mirror positions of V3-V6 on the right side of the chest

Answer

Same positions as V3-V6 but one intercostal space higher

Answer

Along the right midaxillary line from the third to sixth intercostal space

Answer

Directly over the right sternal border at sequential intercostal spaces

Question 6

What is the primary purpose of the right leg (RL) electrode in a standard 12-lead EKG?

Accepted Answer

It serves as a ground reference to reduce electrical interference

Answer

It acts as the negative pole for Lead III

Answer

It provides augmented voltage data for aVF

Answer

It records right ventricular electrical activity