Relias Dysrhythmia Basic A Test ACTUAL
EXAM 2026/2027 | Dysrhythmia Basic A
Certification | Verified Q&A | Pass
Guaranteed - A+ Graded
Section 1: Normal Sinus & Sinus Variants (Questions 1–10)
Q1: A 45-year-old patient has a heart rate of 52 bpm, regular rhythm, normal P waves before every QRS,
PR interval 0.16 sec, QRS 0.08 sec. What is the rhythm?
A. Sinus bradycardia [CORRECT]
B. Sinus arrhythmia
C. First-degree AV block
D. Junctional rhythm
Correct Answer: A
Rationale: Sinus bradycardia is defined by a rate <60 bpm with normal P wave morphology, a normal PR
interval (0.12–0.20 sec), and a narrow QRS. Option B is incorrect because the rhythm is described as
regular; sinus arrhythmia is irregular with respiration. Option C is incorrect because the PR interval is
normal (<0.20 sec). Option D is incorrect because Junctional rhythms typically present with absent or
inverted P waves.
Q2: A patient presents with a heart rate of 110 bpm. The rhythm is regular, with a P wave preceding
every QRS. The P wave morphology is uniform, and the PR interval is 0.16 sec. Which rhythm is this?
A. Sinus bradycardia.
B. Normal sinus rhythm.
C. Sinus tachycardia. [CORRECT]
,D. Atrial fibrillation.
Correct Answer: C
Rationale: Sinus tachycardia is defined by a rate >100 bpm with normal sinus mechanism characteristics
(normal P waves, normal PR interval). Option A is incorrect because the rate is >100. Option B is
incorrect because the rate is >100 (normal range is 60–100). Option D is incorrect because A-fib is
irregularly irregular and lacks distinct P waves.
Q3: The nurse observes a rhythm strip where the heart rate varies between 65 and 85 bpm. The rhythm
is irregular, correlating with the patient's respiratory phases. P waves are present, uniform, and precede
each QRS. What is the most likely rhythm?
A. Sinus arrest.
B. Sinus arrhythmia. [CORRECT]
C. Wandering pacemaker.
D. Premature atrial contractions.
Correct Answer: B
Rationale: Sinus arrhythmia is characterized by irregularity that corresponds to breathing (increasing
with inspiration, decreasing with expiration), originating from the SA node (uniform P waves). Option A
is incorrect; sinus arrest involves a pause without P waves. Option C involves varying P wave
morphology. Option D involves early beats, not respiratory phasic changes.
Q4: Which of the following criteria must be met to classify a rhythm as Normal Sinus Rhythm (NSR)?
A. Heart rate between 40 and 100 bpm.
B. PR interval greater than 0.20 seconds.
C. Regular rhythm, rate 60–100 bpm, normal P waves, PR interval 0.12–0.20 sec. [CORRECT]
D. Irregular rhythm with variable PR intervals.
Correct Answer: C
, Rationale: Normal Sinus Rhythm criteria are strictly defined: Rate 60–100 bpm, regular rhythm, one
normal P wave per QRS, and PR interval within normal limits (0.12–0.20 sec). Option A is incorrect
because the range for NSR is 60–100. Option B describes First-Degree Block. Option D describes A-fib or
Wenckebach.
Q5: A patient is found unresponsive. The monitor shows a regular rhythm with a rate of 160 bpm. P
waves are difficult to distinguish from the T waves of the preceding beat. The QRS is narrow (0.08 sec).
The nurse suspects:
A. Sinus tachycardia.
B. Atrial flutter.
C. Paroxysmal Supraventricular Tachycardia (PSVT). [CORRECT]
D. Ventricular tachycardia.
Correct Answer: C
Rationale: PSVT is a rapid, regular rhythm (usually 150–250 bpm) originating above the ventricles
(narrow QRS). P waves are often buried in the T waves. Sinus tachycardia (A) typically has a slower rate
(usually <150 bpm) and visible P waves. Atrial flutter (B) usually shows sawtooth waves. Ventricular
tachycardia (D) has a wide QRS.
Q6: A 30-year-old athlete presents with a heart rate of 55 bpm. The rhythm is regular, P waves are
upright in lead II, and the PR interval is 0.18 sec. The nurse interprets this as:
A. Sinus bradycardia. [CORRECT]
B. Junctional rhythm.
C. First-degree AV block.
D. Sinus arrhythmia.
Correct Answer: A
Rationale: This meets the criteria for sinus bradycardia: rate <60 bpm, regular, normal P waves, normal
PR interval. Junctional rhythm (B) would have absent or inverted P waves. First-degree block (C) requires
a prolonged PR interval. Sinus arrhythmia (D) is irregular.
EXAM 2026/2027 | Dysrhythmia Basic A
Certification | Verified Q&A | Pass
Guaranteed - A+ Graded
Section 1: Normal Sinus & Sinus Variants (Questions 1–10)
Q1: A 45-year-old patient has a heart rate of 52 bpm, regular rhythm, normal P waves before every QRS,
PR interval 0.16 sec, QRS 0.08 sec. What is the rhythm?
A. Sinus bradycardia [CORRECT]
B. Sinus arrhythmia
C. First-degree AV block
D. Junctional rhythm
Correct Answer: A
Rationale: Sinus bradycardia is defined by a rate <60 bpm with normal P wave morphology, a normal PR
interval (0.12–0.20 sec), and a narrow QRS. Option B is incorrect because the rhythm is described as
regular; sinus arrhythmia is irregular with respiration. Option C is incorrect because the PR interval is
normal (<0.20 sec). Option D is incorrect because Junctional rhythms typically present with absent or
inverted P waves.
Q2: A patient presents with a heart rate of 110 bpm. The rhythm is regular, with a P wave preceding
every QRS. The P wave morphology is uniform, and the PR interval is 0.16 sec. Which rhythm is this?
A. Sinus bradycardia.
B. Normal sinus rhythm.
C. Sinus tachycardia. [CORRECT]
,D. Atrial fibrillation.
Correct Answer: C
Rationale: Sinus tachycardia is defined by a rate >100 bpm with normal sinus mechanism characteristics
(normal P waves, normal PR interval). Option A is incorrect because the rate is >100. Option B is
incorrect because the rate is >100 (normal range is 60–100). Option D is incorrect because A-fib is
irregularly irregular and lacks distinct P waves.
Q3: The nurse observes a rhythm strip where the heart rate varies between 65 and 85 bpm. The rhythm
is irregular, correlating with the patient's respiratory phases. P waves are present, uniform, and precede
each QRS. What is the most likely rhythm?
A. Sinus arrest.
B. Sinus arrhythmia. [CORRECT]
C. Wandering pacemaker.
D. Premature atrial contractions.
Correct Answer: B
Rationale: Sinus arrhythmia is characterized by irregularity that corresponds to breathing (increasing
with inspiration, decreasing with expiration), originating from the SA node (uniform P waves). Option A
is incorrect; sinus arrest involves a pause without P waves. Option C involves varying P wave
morphology. Option D involves early beats, not respiratory phasic changes.
Q4: Which of the following criteria must be met to classify a rhythm as Normal Sinus Rhythm (NSR)?
A. Heart rate between 40 and 100 bpm.
B. PR interval greater than 0.20 seconds.
C. Regular rhythm, rate 60–100 bpm, normal P waves, PR interval 0.12–0.20 sec. [CORRECT]
D. Irregular rhythm with variable PR intervals.
Correct Answer: C
, Rationale: Normal Sinus Rhythm criteria are strictly defined: Rate 60–100 bpm, regular rhythm, one
normal P wave per QRS, and PR interval within normal limits (0.12–0.20 sec). Option A is incorrect
because the range for NSR is 60–100. Option B describes First-Degree Block. Option D describes A-fib or
Wenckebach.
Q5: A patient is found unresponsive. The monitor shows a regular rhythm with a rate of 160 bpm. P
waves are difficult to distinguish from the T waves of the preceding beat. The QRS is narrow (0.08 sec).
The nurse suspects:
A. Sinus tachycardia.
B. Atrial flutter.
C. Paroxysmal Supraventricular Tachycardia (PSVT). [CORRECT]
D. Ventricular tachycardia.
Correct Answer: C
Rationale: PSVT is a rapid, regular rhythm (usually 150–250 bpm) originating above the ventricles
(narrow QRS). P waves are often buried in the T waves. Sinus tachycardia (A) typically has a slower rate
(usually <150 bpm) and visible P waves. Atrial flutter (B) usually shows sawtooth waves. Ventricular
tachycardia (D) has a wide QRS.
Q6: A 30-year-old athlete presents with a heart rate of 55 bpm. The rhythm is regular, P waves are
upright in lead II, and the PR interval is 0.18 sec. The nurse interprets this as:
A. Sinus bradycardia. [CORRECT]
B. Junctional rhythm.
C. First-degree AV block.
D. Sinus arrhythmia.
Correct Answer: A
Rationale: This meets the criteria for sinus bradycardia: rate <60 bpm, regular, normal P waves, normal
PR interval. Junctional rhythm (B) would have absent or inverted P waves. First-degree block (C) requires
a prolonged PR interval. Sinus arrhythmia (D) is irregular.
