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High Yield Chat GPT Practice Test
Question 1
A nurse is analyzing a rhythm strip at 25 mm/sec. There are 4
large boxes between two R waves. What is the heart rate?
A. 60 bpm
B. 75 bpm
C. 100 bpm
D. 150 bpm
Answer: B — 75 bpm
Rationale: Heart rate by large box method: 300 ÷ number of
large boxes between R waves = 300 ÷ 4 = 75 bpm. Each large
box = 0.20 seconds.
Question 2
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A 6-second rhythm strip shows 22 QRS complexes. What is
the heart rate?
A. 110 bpm
B. 132 bpm
C. 220 bpm
D. 1100 bpm
Answer: C — 220 bpm
Rationale: 6-second method: count QRS complexes in 6 seconds
and multiply by 10. 22 × 10 = 220 bpm.
Question 3
The PR interval is measured from:
A. Beginning of P wave to end of QRS
B. Beginning of P wave to beginning of QRS
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C. End of P wave to beginning of QRS
D. Beginning of QRS to end of T wave
Answer: B — Beginning of P wave to beginning of QRS
Rationale: PR interval represents atrial depolarization plus AV
nodal delay. Normal = 0.12–0.20 seconds (3–5 small boxes).
Question 4
On standard ECG paper, 1 mm (1 small box) horizontally
equals:
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 1 second
Answer: A — 0.04 seconds
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Rationale: Standard speed = 25 mm/sec, so 1 mm = 1/25 =
0.04 seconds.
Question 5
A nurse measures the QT interval on a patient with a heart
rate of 60 bpm. The measured QT is 0.48 seconds. What is the
QTc and its significance?
A. QTc 0.48 seconds — borderline prolonged
B. QTc 0.48 seconds — normal
C. QTc 0.48 seconds — prolonged, risk of torsades
D. Cannot calculate without formula
Answer: C — QTc 0.48 seconds — prolonged, risk of torsades
Rationale: Normal QTc <0.44 sec in males, <0.46 sec in
females. 0.48 sec is prolonged, increasing risk for torsades de
pointes regardless of rate.
High Yield Chat GPT Practice Test
Question 1
A nurse is analyzing a rhythm strip at 25 mm/sec. There are 4
large boxes between two R waves. What is the heart rate?
A. 60 bpm
B. 75 bpm
C. 100 bpm
D. 150 bpm
Answer: B — 75 bpm
Rationale: Heart rate by large box method: 300 ÷ number of
large boxes between R waves = 300 ÷ 4 = 75 bpm. Each large
box = 0.20 seconds.
Question 2
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A 6-second rhythm strip shows 22 QRS complexes. What is
the heart rate?
A. 110 bpm
B. 132 bpm
C. 220 bpm
D. 1100 bpm
Answer: C — 220 bpm
Rationale: 6-second method: count QRS complexes in 6 seconds
and multiply by 10. 22 × 10 = 220 bpm.
Question 3
The PR interval is measured from:
A. Beginning of P wave to end of QRS
B. Beginning of P wave to beginning of QRS
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C. End of P wave to beginning of QRS
D. Beginning of QRS to end of T wave
Answer: B — Beginning of P wave to beginning of QRS
Rationale: PR interval represents atrial depolarization plus AV
nodal delay. Normal = 0.12–0.20 seconds (3–5 small boxes).
Question 4
On standard ECG paper, 1 mm (1 small box) horizontally
equals:
A. 0.04 seconds
B. 0.10 seconds
C. 0.20 seconds
D. 1 second
Answer: A — 0.04 seconds
, Page 4 of 161
Rationale: Standard speed = 25 mm/sec, so 1 mm = 1/25 =
0.04 seconds.
Question 5
A nurse measures the QT interval on a patient with a heart
rate of 60 bpm. The measured QT is 0.48 seconds. What is the
QTc and its significance?
A. QTc 0.48 seconds — borderline prolonged
B. QTc 0.48 seconds — normal
C. QTc 0.48 seconds — prolonged, risk of torsades
D. Cannot calculate without formula
Answer: C — QTc 0.48 seconds — prolonged, risk of torsades
Rationale: Normal QTc <0.44 sec in males, <0.46 sec in
females. 0.48 sec is prolonged, increasing risk for torsades de
pointes regardless of rate.
