Certified EKG Technician (CET) Exam — Practice
EKG Analysis and Interpretation: practice questions
Our EKG tech (CET) bank has 64 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
A QRS duration of 0.14 s with an 'M-shaped' (rSR') pattern in V1 suggests
- Atrial flutter
- First-degree AV block
- Left bundle branch block
- Right bundle branch block
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D. Right bundle branch block — RBBB widens the QRS with an rSR' pattern in V1.
Question 2
Which rhythm shows 'sawtooth' waves between QRS complexes?
- Atrial fibrillation
- Atrial flutter
- Sinus tachycardia
- Ventricular fibrillation
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B. Atrial flutter — Flutter waves have a sawtooth pattern, often at a 2:1 or 4:1 conduction ratio.
Question 3
A sinus rhythm at 48 per minute is called
- Normal sinus rhythm
- Atrial flutter
- Sinus tachycardia
- Sinus bradycardia
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D. Sinus bradycardia — Sinus bradycardia is a sinus rhythm below 60/min.
Question 4
After a ventricular pacing spike, what does the QRS usually look like?
- Narrow and normal
- Absent
- Sawtooth
- Wide
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D. Wide — Ventricular paced beats spread cell to cell, producing a wide QRS.
Question 5
Using the 6-second method, a strip has 8 QRS complexes in 6 seconds. What is the heart rate?
- 100 per minute
- 60 per minute
- 80 per minute
- 48 per minute
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C. 80 per minute — Count QRS complexes in 6 seconds and multiply by 10: 8 × 10 = 80.