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RELIAS DYSRHYTHMIA BASIC TEST QUIZ 2026/2027 |
Verified Questions & Answers | Practice Quiz for ECG
Interpretation | Pass Guaranteed - A+ Graded
[Section 1: Sinus Rhythms (Q1-10)]
Q1. What is the normal PR interval range for sinus rhythm?
A. 0.06–0.10 seconds
B. 0.08–0.12 seconds
C. 0.12–0.20 seconds [CORRECT]
D. 0.20–0.30 seconds
Rationale: The normal PR interval in sinus rhythm is 0.12–0.20 seconds, representing
normal AV nodal conduction time.
Correct Answer: C
Q2. A 72-year-old patient is asymptomatic with a heart rate of 52 bpm. The rhythm
strip shows upright P waves before each QRS, a constant PR interval of 0.16 seconds,
and narrow QRS complexes. What is the most likely rhythm?
A. Normal sinus rhythm
B. Sinus bradycardia [CORRECT]
C. Junctional escape rhythm
D. First-degree AV block
Rationale: Upright P waves with a constant PR interval and narrow QRS complexes
indicate sinus origin, and the rate of 52 bpm meets criteria for sinus bradycardia (<60
bpm).
Correct Answer: B
,2
Q3. A 28-year-old patient presents with anxiety and palpitations. The ECG shows a
regular rhythm at 128 bpm with upright P waves preceding each QRS, PR interval
0.14 seconds, and QRS duration 0.08 seconds. What rhythm is present?
A. Atrial tachycardia
B. Sinus tachycardia [CORRECT]
C. Supraventricular tachycardia
D. Junctional tachycardia
Rationale: The rhythm originates from the sinus node as evidenced by upright P
waves with normal morphology, a normal PR interval, and a rate >100 bpm
consistent with sinus tachycardia.
Correct Answer: B
Q4. On a rhythm strip, the R-R intervals gradually lengthen and shorten in a cyclical
pattern corresponding with respiration. The rate varies between 62 and 78 bpm, P
waves are upright and uniform before each QRS, and the PR interval is 0.16 seconds.
What is this rhythm?
A. Sinus arrhythmia with frequent PACs
B. Sinus arrhythmia [CORRECT]
C. Wandering atrial pacemaker
D. Multifocal atrial tachycardia
Rationale: The phasic variation in R-R intervals >0.12 seconds with respiration,
combined with normal upright P waves and a constant PR interval, is diagnostic of
sinus arrhythmia.
Correct Answer: B
Q5. During continuous monitoring, a patient has a 2.4-second pause with no P wave,
QRS complex, or T wave visible, after which the normal sinus rhythm resumes. What
is this event?
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A. Second-degree AV block Type I
B. Sinus arrest [CORRECT]
C. Ventricular asystole
D. Third-degree AV block
Rationale: A pause with absent P waves, QRS complexes, and T waves indicates
failure of the sinus node to fire, which is characteristic of sinus arrest.
Correct Answer: B
Q6. Which of the following criteria must be present to diagnose normal sinus
rhythm?
A. Rate 40–100 bpm with upright P waves in lead II
B. Rate 60–100 bpm, P wave before every QRS, consistent P wave morphology, PR
interval 0.12–0.20 seconds, and QRS <0.10 seconds [CORRECT]
C. Rate 60–100 bpm with variable PR intervals and narrow QRS complexes
D. Rate 60–100 bpm with inverted P waves in leads II, III, and aVF
Rationale: Normal sinus rhythm requires a rate of 60–100 bpm, a P wave before each
QRS with consistent morphology, a PR interval of 0.12–0.20 seconds, and a narrow
QRS complex <0.10 seconds.
Correct Answer: B
Q7. A rhythm strip shows a regular rhythm at 48 bpm with upright P waves in lead II
preceding each QRS, a PR interval of 0.18 seconds, and narrow QRS complexes
measuring 0.08 seconds. What is the correct interpretation?
A. Junctional rhythm
B. First-degree AV block
C. Sinus bradycardia [CORRECT]
D. Second-degree AV block Type II
RELIAS DYSRHYTHMIA BASIC TEST QUIZ 2026/2027 |
Verified Questions & Answers | Practice Quiz for ECG
Interpretation | Pass Guaranteed - A+ Graded
[Section 1: Sinus Rhythms (Q1-10)]
Q1. What is the normal PR interval range for sinus rhythm?
A. 0.06–0.10 seconds
B. 0.08–0.12 seconds
C. 0.12–0.20 seconds [CORRECT]
D. 0.20–0.30 seconds
Rationale: The normal PR interval in sinus rhythm is 0.12–0.20 seconds, representing
normal AV nodal conduction time.
Correct Answer: C
Q2. A 72-year-old patient is asymptomatic with a heart rate of 52 bpm. The rhythm
strip shows upright P waves before each QRS, a constant PR interval of 0.16 seconds,
and narrow QRS complexes. What is the most likely rhythm?
A. Normal sinus rhythm
B. Sinus bradycardia [CORRECT]
C. Junctional escape rhythm
D. First-degree AV block
Rationale: Upright P waves with a constant PR interval and narrow QRS complexes
indicate sinus origin, and the rate of 52 bpm meets criteria for sinus bradycardia (<60
bpm).
Correct Answer: B
,2
Q3. A 28-year-old patient presents with anxiety and palpitations. The ECG shows a
regular rhythm at 128 bpm with upright P waves preceding each QRS, PR interval
0.14 seconds, and QRS duration 0.08 seconds. What rhythm is present?
A. Atrial tachycardia
B. Sinus tachycardia [CORRECT]
C. Supraventricular tachycardia
D. Junctional tachycardia
Rationale: The rhythm originates from the sinus node as evidenced by upright P
waves with normal morphology, a normal PR interval, and a rate >100 bpm
consistent with sinus tachycardia.
Correct Answer: B
Q4. On a rhythm strip, the R-R intervals gradually lengthen and shorten in a cyclical
pattern corresponding with respiration. The rate varies between 62 and 78 bpm, P
waves are upright and uniform before each QRS, and the PR interval is 0.16 seconds.
What is this rhythm?
A. Sinus arrhythmia with frequent PACs
B. Sinus arrhythmia [CORRECT]
C. Wandering atrial pacemaker
D. Multifocal atrial tachycardia
Rationale: The phasic variation in R-R intervals >0.12 seconds with respiration,
combined with normal upright P waves and a constant PR interval, is diagnostic of
sinus arrhythmia.
Correct Answer: B
Q5. During continuous monitoring, a patient has a 2.4-second pause with no P wave,
QRS complex, or T wave visible, after which the normal sinus rhythm resumes. What
is this event?
, 3
A. Second-degree AV block Type I
B. Sinus arrest [CORRECT]
C. Ventricular asystole
D. Third-degree AV block
Rationale: A pause with absent P waves, QRS complexes, and T waves indicates
failure of the sinus node to fire, which is characteristic of sinus arrest.
Correct Answer: B
Q6. Which of the following criteria must be present to diagnose normal sinus
rhythm?
A. Rate 40–100 bpm with upright P waves in lead II
B. Rate 60–100 bpm, P wave before every QRS, consistent P wave morphology, PR
interval 0.12–0.20 seconds, and QRS <0.10 seconds [CORRECT]
C. Rate 60–100 bpm with variable PR intervals and narrow QRS complexes
D. Rate 60–100 bpm with inverted P waves in leads II, III, and aVF
Rationale: Normal sinus rhythm requires a rate of 60–100 bpm, a P wave before each
QRS with consistent morphology, a PR interval of 0.12–0.20 seconds, and a narrow
QRS complex <0.10 seconds.
Correct Answer: B
Q7. A rhythm strip shows a regular rhythm at 48 bpm with upright P waves in lead II
preceding each QRS, a PR interval of 0.18 seconds, and narrow QRS complexes
measuring 0.08 seconds. What is the correct interpretation?
A. Junctional rhythm
B. First-degree AV block
C. Sinus bradycardia [CORRECT]
D. Second-degree AV block Type II
