EKG certification Certification FREE ECG Technician Certification Exam Question and Answers 3

Question 1

A rhythm strip shows irregularly irregular R-R intervals with no discernible P waves. What is the most likely rhythm?

Accepted Answer

Atrial fibrillation

Answer

Irregularly irregular rhythm with absent P waves is the hallmark of atrial fibrillation.

Question 2

What is the standard paper speed used for ECG recording in the United States?

Accepted Answer

25 mm/sec

Answer

The standard ECG paper speed in the US is 25 mm per second, making each small box represent 0.04 seconds.

Question 3

Which electrolyte imbalance is most commonly associated with tall, peaked T waves on an ECG?

Accepted Answer

Hyperkalemia

Answer

Hyperkalemia classically produces tall, narrow, peaked T waves as one of its earliest ECG manifestations.

Question 4

An ECG technician accidentally reverses the right arm and left arm electrodes. Which leads will display inverted waveforms?

Accepted Answer

Lead I will be inverted

Answer

Reversing the right and left arm electrodes causes lead I to display as an inverted mirror image of the correct tracing.

Question 5

What is the normal QT interval range for a heart rate of 60-100 bpm?

Accepted Answer

0.36 to 0.44 seconds

Answer

The corrected QT interval normally ranges from 0.36 to 0.44 seconds at typical heart rates.

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