NCCT Electrocardiography Technician Fundamentals

Question 1

The P wave on an ECG represents:

Accepted Answer

Atrial depolarization

Answer

Ventricular depolarization

Answer

Ventricular repolarization

Answer

Atrial repolarization

Question 2

A normal PR interval duration on an adult ECG is:

Accepted Answer

0.12–0.20 seconds

Answer

0.06–0.10 seconds

Answer

0.20–0.30 seconds

Answer

0.40–0.60 seconds

Question 3

The QRS complex on an ECG represents:

Accepted Answer

Ventricular depolarization

Answer

Atrial depolarization

Answer

Ventricular repolarization

Answer

SA node firing

Question 4

In a standard 12-lead ECG, how many chest (precordial) leads are there?

Accepted Answer

6

Answer

4

Answer

8

Answer

10

Question 5

Which of the following is the primary pacemaker of the heart?

Accepted Answer

SA node

Answer

AV node

Answer

Bundle of His

Answer

Purkinje fibers

Question 6

Artifact on an ECG tracing is most commonly caused by:

Accepted Answer

Patient movement or muscle tremor

Answer

Slow paper speed

Answer

Incorrect lead placement on the chest

Answer

Low battery in the ECG machine