1
Relias Dysrhythmia Basic B 2026/2027 Actual
Exam | 35 Questions with Answers | Pass
Guaranteed - A+ Graded
Section 1: Normal Sinus Rhythm and Sinus Variants
Q1: A rhythm strip shows regular R-R intervals, a heart rate of 75 bpm, a P wave preceding each
QRS complex, a PR interval of 0.16 seconds, and a QRS duration of 0.08 seconds. Which
statement best describes this rhythm?
A. Sinus bradycardia
B. Normal sinus rhythm [CORRECT]
C. Sinus arrhythmia
D. First-degree AV block
Correct Answer: B
Rationale: Normal sinus rhythm (NSR) is defined by a rate of 60-100 bpm, regular rhythm,
normal P waves with a consistent 1:1 P-to-QRS ratio, and normal PR (0.12-0.20 sec) and QRS
(<0.12 sec) intervals. Option A is incorrect because the rate is within normal limits, not <60.
Option C is incorrect because the rhythm is regular. Option D is incorrect because the PR
interval is normal.
Q2: The patient's cardiac monitor displays a regular rhythm at a rate of 115 bpm. P waves are
upright and uniform, preceding each QRS complex. The PR interval is 0.14 seconds. What is the
correct interpretation?
A. Sinus bradycardia
B. Normal sinus rhythm
C. Sinus tachycardia [CORRECT]
D. Atrial tachycardia
Correct Answer: C
,2
Rationale: Sinus tachycardia meets all the criteria for sinus rhythm (normal P waves, normal PR
interval, regular) but the rate is greater than 100 bpm. Option A is incorrect as the rate is >100.
Option B is incorrect as the rate exceeds 100. Option D (atrial tachycardia) typically involves
rates >150 bpm and often has distinct P wave morphology differences compared to sinus P
waves.
Q3: A rhythm strip demonstrates a heart rate of 68 bpm. The R-R intervals vary slightly, with the
rate increasing during inspiration and decreasing during expiration. P waves are normal and
precede each QRS. This rhythm is:
A. Normal sinus rhythm
B. Sinus arrhythmia [CORRECT]
C. Atrial fibrillation
D. Wandering atrial pacemaker
Correct Answer: B
Rationale: Sinus arrhythmia is characterized by an irregular rhythm that varies with the
respiratory cycle (increases with inspiration, decreases with expiration) while maintaining
normal sinus P wave morphology. Option A requires a regular rhythm. Option C has no
discernible P waves. Option D involves varying P wave morphologies.
Q4: A patient's monitor shows a sudden pause in the rhythm where a PQRST complex is
expected. The pause is not preceded by a premature beat. Following the pause, the sinus node
resumes pacing. This is characteristic of:
A. Sinus arrest [CORRECT]
B. Premature atrial contraction (PAC)
C. Second-degree AV block Type I
D. Premature ventricular contraction (PVC)
Correct Answer: A
Rationale: Sinus arrest (or sinus pause) occurs when the SA node fails to fire, resulting in a pause
that is not a multiple of the underlying R-R interval. Option B and D are premature beats that
, 3
would reset the rhythm. Option C involves a dropped QRS complex following a lengthening PR
interval, which was not described.
Q5: You are calculating the heart rate on a 6-second rhythm strip. You count 7 R-R cycles within
the 6-second interval. What is the estimated heart rate?
A. 60 bpm
B. 70 bpm [CORRECT]
C. 84 bpm
D. 100 bpm
Correct Answer: B
Rationale: The 6-second method involves counting the number of R-R cycles in a 6-second strip
and multiplying by 10. (7 cycles × 10 = 70 bpm). This is a quick estimation method often used
for irregular rhythms.
Section 2: Atrial Dysrhythmias
Q6: A rhythm strip shows an irregularly irregular rhythm with no distinct P waves. The baseline
shows chaotic, fibrillatory waves. The ventricular rate is 130 bpm. This rhythm is:
A. Atrial flutter
B. Atrial fibrillation [CORRECT]
C. Sinus arrhythmia
D. Multifocal atrial tachycardia
Correct Answer: B
Rationale: Atrial fibrillation is characterized by an irregularly irregular rhythm, absence of
organized P waves (replaced by fibrillatory waves), and a variable ventricular response. Option A
(atrial flutter) has "sawtooth" flutter waves and is often regular or regularly irregular. Option C
has distinct P waves. Option D requires three or more distinct P wave morphologies.
Relias Dysrhythmia Basic B 2026/2027 Actual
Exam | 35 Questions with Answers | Pass
Guaranteed - A+ Graded
Section 1: Normal Sinus Rhythm and Sinus Variants
Q1: A rhythm strip shows regular R-R intervals, a heart rate of 75 bpm, a P wave preceding each
QRS complex, a PR interval of 0.16 seconds, and a QRS duration of 0.08 seconds. Which
statement best describes this rhythm?
A. Sinus bradycardia
B. Normal sinus rhythm [CORRECT]
C. Sinus arrhythmia
D. First-degree AV block
Correct Answer: B
Rationale: Normal sinus rhythm (NSR) is defined by a rate of 60-100 bpm, regular rhythm,
normal P waves with a consistent 1:1 P-to-QRS ratio, and normal PR (0.12-0.20 sec) and QRS
(<0.12 sec) intervals. Option A is incorrect because the rate is within normal limits, not <60.
Option C is incorrect because the rhythm is regular. Option D is incorrect because the PR
interval is normal.
Q2: The patient's cardiac monitor displays a regular rhythm at a rate of 115 bpm. P waves are
upright and uniform, preceding each QRS complex. The PR interval is 0.14 seconds. What is the
correct interpretation?
A. Sinus bradycardia
B. Normal sinus rhythm
C. Sinus tachycardia [CORRECT]
D. Atrial tachycardia
Correct Answer: C
,2
Rationale: Sinus tachycardia meets all the criteria for sinus rhythm (normal P waves, normal PR
interval, regular) but the rate is greater than 100 bpm. Option A is incorrect as the rate is >100.
Option B is incorrect as the rate exceeds 100. Option D (atrial tachycardia) typically involves
rates >150 bpm and often has distinct P wave morphology differences compared to sinus P
waves.
Q3: A rhythm strip demonstrates a heart rate of 68 bpm. The R-R intervals vary slightly, with the
rate increasing during inspiration and decreasing during expiration. P waves are normal and
precede each QRS. This rhythm is:
A. Normal sinus rhythm
B. Sinus arrhythmia [CORRECT]
C. Atrial fibrillation
D. Wandering atrial pacemaker
Correct Answer: B
Rationale: Sinus arrhythmia is characterized by an irregular rhythm that varies with the
respiratory cycle (increases with inspiration, decreases with expiration) while maintaining
normal sinus P wave morphology. Option A requires a regular rhythm. Option C has no
discernible P waves. Option D involves varying P wave morphologies.
Q4: A patient's monitor shows a sudden pause in the rhythm where a PQRST complex is
expected. The pause is not preceded by a premature beat. Following the pause, the sinus node
resumes pacing. This is characteristic of:
A. Sinus arrest [CORRECT]
B. Premature atrial contraction (PAC)
C. Second-degree AV block Type I
D. Premature ventricular contraction (PVC)
Correct Answer: A
Rationale: Sinus arrest (or sinus pause) occurs when the SA node fails to fire, resulting in a pause
that is not a multiple of the underlying R-R interval. Option B and D are premature beats that
, 3
would reset the rhythm. Option C involves a dropped QRS complex following a lengthening PR
interval, which was not described.
Q5: You are calculating the heart rate on a 6-second rhythm strip. You count 7 R-R cycles within
the 6-second interval. What is the estimated heart rate?
A. 60 bpm
B. 70 bpm [CORRECT]
C. 84 bpm
D. 100 bpm
Correct Answer: B
Rationale: The 6-second method involves counting the number of R-R cycles in a 6-second strip
and multiplying by 10. (7 cycles × 10 = 70 bpm). This is a quick estimation method often used
for irregular rhythms.
Section 2: Atrial Dysrhythmias
Q6: A rhythm strip shows an irregularly irregular rhythm with no distinct P waves. The baseline
shows chaotic, fibrillatory waves. The ventricular rate is 130 bpm. This rhythm is:
A. Atrial flutter
B. Atrial fibrillation [CORRECT]
C. Sinus arrhythmia
D. Multifocal atrial tachycardia
Correct Answer: B
Rationale: Atrial fibrillation is characterized by an irregularly irregular rhythm, absence of
organized P waves (replaced by fibrillatory waves), and a variable ventricular response. Option A
(atrial flutter) has "sawtooth" flutter waves and is often regular or regularly irregular. Option C
has distinct P waves. Option D requires three or more distinct P wave morphologies.
