EKG certification Certification EKG Electrode Placement & Lead Systems 1

Question 1

When placing precordial leads for a 12-lead EKG, where is the V1 electrode positioned?

Accepted Answer

Fourth intercostal space, right sternal border

Answer

V1 is placed at the fourth intercostal space along the RIGHT sternal border. V2 mirrors it on the left sternal border. This pair straddles the sternum and provides a septal view of the heart.

Question 2

Which precordial leads are classified as the lateral leads on a standard 12-lead EKG?

Accepted Answer

V5 and V6

Answer

V5 and V6 are the lateral precordial leads. Together with leads I and aVL (limb lateral leads), they provide a view of the lateral wall of the left ventricle.

Question 3

Where is the V6 electrode correctly placed during a 12-lead EKG?

Accepted Answer

Midaxillary line at the fifth intercostal space

Answer

V6 is placed at the midaxillary line, level with V4 and V5 horizontally. This position captures electrical activity from the lateral left ventricular wall.

Question 4

In a standard 12-lead EKG, which lead is formed by the combination of leads I and III and does NOT require a separate electrode?

Accepted Answer

aVF

Answer

aVF is an augmented unipolar limb lead derived from the left foot electrode, with the positive pole at the left foot and the reference formed by combining the right arm and left arm electrodes. It views the heart from an inferior perspective and requires no extra electrode.

Question 5

A technician places the right leg electrode during a 12-lead EKG. What is the primary function of this electrode?

Accepted Answer

It acts as an electrical ground to reduce interference

Answer

The right leg (RL) electrode serves as the electrical ground for the entire recording. It does not contribute to any of the 12 leads but helps minimize electrical interference and artifact in the tracing.

EKG certification Practice Test

EKG certification Practice Test

EKG certification Certification EKG Electrode Placement & Lead Systems 1