ADVANCED RELIAS DYSRHYTHMIAS 2026
EXAM B COMPLETE (150) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED EXPLANATIONS|GUARANTEED
PASS.
DYSRHYTHMIAS
Prepare for the Advanced Relias Dysrhythmias Exam B with practice
questions covering advanced ECG interpretation, cardiac
arrhythmias, interval measurements, conduction disorders, rhythm
analysis, and emergency cardiac response concepts. This study
guide helps reinforce essential electrocardiography knowledge and
supports effective exam preparation. Designed to improve rhythm
recognition skills and boost confidence in advanced cardiac patient
care. Suitable for nursing, telemetry, and healthcare professionals.
MULTIPLE CHOICE.
Section 1: Foundational Measurements & Normal Values (Q1-20)
Q1. A patient has a heart rate of 42 bpm. The P wave precedes every QRS, the PR
interval is 0.20 seconds, and the QRS is 0.10 seconds. What is the rhythm?
A. Sinus bradycardia
B. First-degree AV block
C. Junctional rhythm
D. Sinus arrhythmia
Answer: A. Sinus bradycardia
Rationale: Sinus bradycardia is defined by a rate <60 bpm with normal P waves, a
consistent PR interval (0.12-0.20 sec), and a narrow QRS. First-degree AV block would
have a PR >0.20 sec.
,Q2. Which of the following correctly defines a normal PR interval?
A. 0.06–0.10 sec
B. 0.12–0.20 sec
C. 0.20–0.30 sec
D. 0.35–0.44 sec
Answer: B. 0.12–0.20 sec
Rationale: The PR interval represents the time from the start of atrial depolarization to
the start of ventricular depolarization. A prolonged PR interval (>0.20 sec) indicates a
delay in AV conduction.
Q3. What is the duration of one small box on an ECG strip at standard paper speed
(25 mm/sec)?
A. 0.04 seconds
B. 0.10 seconds
,C. 0.20 seconds
D. 1.00 second
Answer: A. 0.04 seconds
Rationale: Each small box is 1 mm wide. At 25 mm/sec paper speed, each small box
equals 0.04 seconds. Five small boxes make up one large box, which is 0.20 seconds.
Q4. What is the normal duration of a QRS complex?
A. <0.06 seconds
B. 0.06–0.10 seconds
C. 0.10–0.12 seconds
D. 0.12–0.20 seconds
Answer: B. 0.06–0.10 seconds
Rationale: A narrow QRS complex (<0.10 sec) indicates that the electrical impulse is
conducted normally through the ventricles via the Purkinje fibers. A QRS >0.12 sec is
considered wide and indicates a ventricular origin or bundle branch block.
Q5. You are calculating the corrected QT interval (QTc) using Bazett's formula. The
QT interval is 0.44 seconds, and the RR interval is 0.80 seconds. What is the QTc?
A. 0.44 sec
B. 0.49 sec
C. 0.38 sec
D. 0.52 sec
Answer: B. 0.49 sec
Rationale: Bazett's formula is QTc = QT / √(RR). √0.80 = 0.894. 0..894 = 0.492
seconds. A normal QTc is ≤0.44 sec in males and ≤0.46 sec in females.
Q6. A nurse counts 12 QRS complexes on a 6-second rhythm strip. What is the
patient's heart rate?
A. 60 bpm
B. 120 bpm
C. 100 bpm
D. 72 bpm
, Answer: B. 120 bpm
Rationale: For irregular rhythms, count the number of QRS complexes in a 6-second
strip and multiply by 10. 12 × 10 = 120 bpm.
Q7. What is the intrinsic firing rate of the AV node?
A. 60-100 bpm
B. 40-60 bpm
C. 20-40 bpm
D. >100 bpm
Answer: B. 40-60 bpm
Rationale: The SA node is the primary pacemaker (60-100 bpm). The AV node acts as
the secondary pacemaker with an intrinsic rate of 40-60 bpm. The Purkinje fibers are the
tertiary pacemaker with a rate of 20-40 bpm.
Q8. Which ECG finding is most suggestive of hyperkalemia?
A. Osborn waves
B. Prominent U waves
C. Peaked T waves
D. Delta waves
Answer: C. Peaked T waves
Rationale: Tall, peaked, "tented" T waves are an early and characteristic sign of
hyperkalemia. As hyperkalemia worsens, the QRS widens, leading to a sine wave
pattern.
Q9. A patient has a regular rhythm with a rate of 180 bpm, narrow QRS complexes,
and no visible P waves. What is the most likely rhythm?
A. Atrial flutter
B. Sinus tachycardia
C. Supraventricular tachycardia (SVT)
D. Ventricular tachycardia
Answer: C. Supraventricular tachycardia (SVT)
EXAM B COMPLETE (150) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH
DETAILED EXPLANATIONS|GUARANTEED
PASS.
DYSRHYTHMIAS
Prepare for the Advanced Relias Dysrhythmias Exam B with practice
questions covering advanced ECG interpretation, cardiac
arrhythmias, interval measurements, conduction disorders, rhythm
analysis, and emergency cardiac response concepts. This study
guide helps reinforce essential electrocardiography knowledge and
supports effective exam preparation. Designed to improve rhythm
recognition skills and boost confidence in advanced cardiac patient
care. Suitable for nursing, telemetry, and healthcare professionals.
MULTIPLE CHOICE.
Section 1: Foundational Measurements & Normal Values (Q1-20)
Q1. A patient has a heart rate of 42 bpm. The P wave precedes every QRS, the PR
interval is 0.20 seconds, and the QRS is 0.10 seconds. What is the rhythm?
A. Sinus bradycardia
B. First-degree AV block
C. Junctional rhythm
D. Sinus arrhythmia
Answer: A. Sinus bradycardia
Rationale: Sinus bradycardia is defined by a rate <60 bpm with normal P waves, a
consistent PR interval (0.12-0.20 sec), and a narrow QRS. First-degree AV block would
have a PR >0.20 sec.
,Q2. Which of the following correctly defines a normal PR interval?
A. 0.06–0.10 sec
B. 0.12–0.20 sec
C. 0.20–0.30 sec
D. 0.35–0.44 sec
Answer: B. 0.12–0.20 sec
Rationale: The PR interval represents the time from the start of atrial depolarization to
the start of ventricular depolarization. A prolonged PR interval (>0.20 sec) indicates a
delay in AV conduction.
Q3. What is the duration of one small box on an ECG strip at standard paper speed
(25 mm/sec)?
A. 0.04 seconds
B. 0.10 seconds
,C. 0.20 seconds
D. 1.00 second
Answer: A. 0.04 seconds
Rationale: Each small box is 1 mm wide. At 25 mm/sec paper speed, each small box
equals 0.04 seconds. Five small boxes make up one large box, which is 0.20 seconds.
Q4. What is the normal duration of a QRS complex?
A. <0.06 seconds
B. 0.06–0.10 seconds
C. 0.10–0.12 seconds
D. 0.12–0.20 seconds
Answer: B. 0.06–0.10 seconds
Rationale: A narrow QRS complex (<0.10 sec) indicates that the electrical impulse is
conducted normally through the ventricles via the Purkinje fibers. A QRS >0.12 sec is
considered wide and indicates a ventricular origin or bundle branch block.
Q5. You are calculating the corrected QT interval (QTc) using Bazett's formula. The
QT interval is 0.44 seconds, and the RR interval is 0.80 seconds. What is the QTc?
A. 0.44 sec
B. 0.49 sec
C. 0.38 sec
D. 0.52 sec
Answer: B. 0.49 sec
Rationale: Bazett's formula is QTc = QT / √(RR). √0.80 = 0.894. 0..894 = 0.492
seconds. A normal QTc is ≤0.44 sec in males and ≤0.46 sec in females.
Q6. A nurse counts 12 QRS complexes on a 6-second rhythm strip. What is the
patient's heart rate?
A. 60 bpm
B. 120 bpm
C. 100 bpm
D. 72 bpm
, Answer: B. 120 bpm
Rationale: For irregular rhythms, count the number of QRS complexes in a 6-second
strip and multiply by 10. 12 × 10 = 120 bpm.
Q7. What is the intrinsic firing rate of the AV node?
A. 60-100 bpm
B. 40-60 bpm
C. 20-40 bpm
D. >100 bpm
Answer: B. 40-60 bpm
Rationale: The SA node is the primary pacemaker (60-100 bpm). The AV node acts as
the secondary pacemaker with an intrinsic rate of 40-60 bpm. The Purkinje fibers are the
tertiary pacemaker with a rate of 20-40 bpm.
Q8. Which ECG finding is most suggestive of hyperkalemia?
A. Osborn waves
B. Prominent U waves
C. Peaked T waves
D. Delta waves
Answer: C. Peaked T waves
Rationale: Tall, peaked, "tented" T waves are an early and characteristic sign of
hyperkalemia. As hyperkalemia worsens, the QRS widens, leading to a sine wave
pattern.
Q9. A patient has a regular rhythm with a rate of 180 bpm, narrow QRS complexes,
and no visible P waves. What is the most likely rhythm?
A. Atrial flutter
B. Sinus tachycardia
C. Supraventricular tachycardia (SVT)
D. Ventricular tachycardia
Answer: C. Supraventricular tachycardia (SVT)
