EKG certification Certification EKG Certification General 1

Question 1

What is the normal duration of a QRS complex in an adult?

Accepted Answer

0.04–0.10 seconds

Answer

A normal QRS complex measures 0.04–0.10 seconds (up to 2.5 small squares). A duration greater than 0.12 seconds suggests a bundle branch block or ventricular conduction delay.

Question 2

On a standard EKG, how fast does the paper move?

Accepted Answer

25 mm/sec

Answer

Standard EKG paper speed is 25 mm/sec. This means each small square (1 mm) represents 0.04 seconds, and each large square (5 mm) represents 0.20 seconds.

Question 3

Which waveform on an EKG represents atrial depolarization?

Accepted Answer

P wave

Answer

The P wave represents atrial depolarization — the electrical impulse spreading through the atria from the SA node. The QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization.

Question 4

A rhythm strip shows no visible P waves and an irregularly irregular ventricular response. What is the most likely rhythm?

Accepted Answer

Atrial fibrillation

Answer

Atrial fibrillation is characterized by chaotic atrial activity with no discrete P waves, a fibrillatory baseline, and an irregularly irregular ventricular response. Atrial flutter shows sawtooth flutter waves at a regular rate.

Question 5

What does the T wave on an EKG represent?

Accepted Answer

Ventricular repolarization

Answer

The T wave represents ventricular repolarization — the recovery phase of the ventricles after contraction. Atrial repolarization occurs but is hidden within the QRS complex.

EKG certification Practice Test

EKG certification Practice Test

EKG certification Certification EKG Certification General 1