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Relias Dysrhythmias Exam B Complete
60 Questions Relias Dysrhythmia
Advanced with Measurements B Exam
Question 1
What are the complete characteristics of Normal Sinus Rhythm
(NSR)?
A. Regular rhythm, rate 60–100 bpm, P wave before every
QRS, PR interval 0.12–0.20 sec, QRS <0.12 sec
B. Irregular rhythm, rate 60–100 bpm, absent P waves, wide
QRS
C. Regular rhythm, rate 40–60 bpm, inverted P waves, PR
interval <0.12 sec
D. Irregular rhythm, rate >100 bpm, sawtooth P waves
Correct Answer: A
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Rationale: NSR represents normal electrical activity originating
from the SA node, characterized by regular rhythm, rate
between 60–100 bpm, upright uniform P waves preceding each
QRS, PR interval 0.12–0.20 seconds (3–5 small boxes), and
narrow QRS duration ≤0.10–0.12 seconds (≤3 small boxes).
Question 2
The normal PR interval duration is:
A. 0.04–0.10 seconds
B. 0.12–0.20 seconds
C. 0.20–0.30 seconds
D. 0.30–0.40 seconds
Correct Answer: B
Rationale: The PR interval is measured from the beginning of the
P wave to the beginning of the QRS complex. Normal duration is
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0.12–0.20 seconds (3–5 small boxes at standard speed of 25
mm/sec). A prolonged PR interval (>0.20 sec) indicates first-
degree AV block, while a short PR interval (<0.12 sec) may
indicate pre-excitation such as Wolff-Parkinson-White (WPW)
syndrome.
Question 3
The normal QRS duration is:
A. <0.06 seconds
B. <0.10–0.12 seconds
C. 0.12–0.20 seconds
D. 0.20–0.30 seconds
Correct Answer: B
Rationale: The QRS complex represents ventricular
depolarization. Normal QRS duration is <0.10–0.12 seconds
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(<3 small boxes). A prolonged QRS suggests an intraventricular
conduction delay, bundle branch block, or ventricular origin of
the rhythm.
Question 4
On ECG paper running at standard speed of 25 mm/sec, each
small box represents:
A. 0.04 seconds
B. 0.20 seconds
C. 0.10 seconds
D. 1.00 second
Correct Answer: A
Rationale: At standard speed, 25 mm = 1 second. Each small
box is 1 mm wide and represents 0.04 seconds. Five small boxes
make one large box representing 0.20 seconds.
Relias Dysrhythmias Exam B Complete
60 Questions Relias Dysrhythmia
Advanced with Measurements B Exam
Question 1
What are the complete characteristics of Normal Sinus Rhythm
(NSR)?
A. Regular rhythm, rate 60–100 bpm, P wave before every
QRS, PR interval 0.12–0.20 sec, QRS <0.12 sec
B. Irregular rhythm, rate 60–100 bpm, absent P waves, wide
QRS
C. Regular rhythm, rate 40–60 bpm, inverted P waves, PR
interval <0.12 sec
D. Irregular rhythm, rate >100 bpm, sawtooth P waves
Correct Answer: A
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Rationale: NSR represents normal electrical activity originating
from the SA node, characterized by regular rhythm, rate
between 60–100 bpm, upright uniform P waves preceding each
QRS, PR interval 0.12–0.20 seconds (3–5 small boxes), and
narrow QRS duration ≤0.10–0.12 seconds (≤3 small boxes).
Question 2
The normal PR interval duration is:
A. 0.04–0.10 seconds
B. 0.12–0.20 seconds
C. 0.20–0.30 seconds
D. 0.30–0.40 seconds
Correct Answer: B
Rationale: The PR interval is measured from the beginning of the
P wave to the beginning of the QRS complex. Normal duration is
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0.12–0.20 seconds (3–5 small boxes at standard speed of 25
mm/sec). A prolonged PR interval (>0.20 sec) indicates first-
degree AV block, while a short PR interval (<0.12 sec) may
indicate pre-excitation such as Wolff-Parkinson-White (WPW)
syndrome.
Question 3
The normal QRS duration is:
A. <0.06 seconds
B. <0.10–0.12 seconds
C. 0.12–0.20 seconds
D. 0.20–0.30 seconds
Correct Answer: B
Rationale: The QRS complex represents ventricular
depolarization. Normal QRS duration is <0.10–0.12 seconds
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(<3 small boxes). A prolonged QRS suggests an intraventricular
conduction delay, bundle branch block, or ventricular origin of
the rhythm.
Question 4
On ECG paper running at standard speed of 25 mm/sec, each
small box represents:
A. 0.04 seconds
B. 0.20 seconds
C. 0.10 seconds
D. 1.00 second
Correct Answer: A
Rationale: At standard speed, 25 mm = 1 second. Each small
box is 1 mm wide and represents 0.04 seconds. Five small boxes
make one large box representing 0.20 seconds.
