RELIAS DYSRHYTHMIA BASIC B EXAM –QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains *
Cardiac Anatomy and Physiology *
Electrophysiology and Conduction Pathways *
ECG Lead Placement and Waveform Analysis *
Sinus and Atrial Dysrhythmias *
Junctional and Ventricular Rhythms *
Atrioventricular (AV) Blocks *
, Pacemaker Function and Malfunction *
Pharmacological Interventions and ACLS Protocols *
Emergency Cardiac Care and Clinical Correlation *
Introduction *
The purpose of this comprehensive assessment is to evaluate a healthcare professional's profici
1. Which part of the cardiac conduction system acts as the primary pacemaker of the heart?
A. AV Node
🟢 B. SA Node
C. Bundle of His
D. Purkinje Fibers
🔴 RATIONALE: The Sinoatrial (SA) node is the intrinsic pacemaker of the heart, typically initiating impulses at a
rate of 60 to 100 beats per minute.
, 2. A patient's ECG shows a rhythm with a PR interval of 0.24 seconds and a QRS duration of 0.08 seconds.
What is the most likely interpretation?
🟢 A. First-degree AV Block
B. Second-degree AV Block Type I
C. Normal Sinus Rhythm
D. Third-degree AV Block
🔴 RATIONALE: A PR interval greater than 0.20 seconds with a 1:1 P-to-QRS ratio defines a First-degree AV
block.
3. During an assessment, a nurse notes a "sawtooth" pattern on the ECG monitor. This is characteristic of:
A. Atrial Fibrillation
B. Ventricular Tachycardia
🟢 C. Atrial Flutter
D. Sinus Exit Block
🔴 RATIONALE: Atrial flutter is characterized by "F" waves that create a distinct sawtooth or picket-fence
appearance on the baseline.
4. Which of the following is the most appropriate initial intervention for a patient in Pulseless Ventricular
Tachycardia?
A. Synchronized Cardioversion
B. Administration of Atropine
🟢 C. Immediate Defibrillation
D. Administration of Magnesium Sulfate
, 🔴 RATIONALE: Pulseless Ventricular Tachycardia is a shockable rhythm; per ACLS guidelines, immediate
defibrillation is the priority.
5. A PR interval is measured from the:
🟢 A. Beginning of the P wave to the beginning of the QRS complex
B. Peak of the P wave to the R wave
C. End of the P wave to the start of the QRS
D. Beginning of the P wave to the end of the P wave
🔴 RATIONALE: The PR interval represents the time from atrial depolarization to the start of ventricular
depolarization.
6. Failure to sense in a permanent pacemaker is identified on an ECG by:
A. Pacing spikes not followed by a QRS complex
B. Absence of pacing spikes where they should be
🟢 C. Pacing spikes occurring within the patient's own QRS complex
D. A wide QRS complex following every spike
🔴 RATIONALE: Failure to sense occurs when the pacemaker does not detect the heart's intrinsic activity and
fires inappropriately.
7. Which electrolyte imbalance is most commonly associated with the presence of a U wave on an ECG?
A. Hyperkalemia
🟢 B. Hypokalemia
C. Hypercalcemia
D. Hyponatremia
PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains *
Cardiac Anatomy and Physiology *
Electrophysiology and Conduction Pathways *
ECG Lead Placement and Waveform Analysis *
Sinus and Atrial Dysrhythmias *
Junctional and Ventricular Rhythms *
Atrioventricular (AV) Blocks *
, Pacemaker Function and Malfunction *
Pharmacological Interventions and ACLS Protocols *
Emergency Cardiac Care and Clinical Correlation *
Introduction *
The purpose of this comprehensive assessment is to evaluate a healthcare professional's profici
1. Which part of the cardiac conduction system acts as the primary pacemaker of the heart?
A. AV Node
🟢 B. SA Node
C. Bundle of His
D. Purkinje Fibers
🔴 RATIONALE: The Sinoatrial (SA) node is the intrinsic pacemaker of the heart, typically initiating impulses at a
rate of 60 to 100 beats per minute.
, 2. A patient's ECG shows a rhythm with a PR interval of 0.24 seconds and a QRS duration of 0.08 seconds.
What is the most likely interpretation?
🟢 A. First-degree AV Block
B. Second-degree AV Block Type I
C. Normal Sinus Rhythm
D. Third-degree AV Block
🔴 RATIONALE: A PR interval greater than 0.20 seconds with a 1:1 P-to-QRS ratio defines a First-degree AV
block.
3. During an assessment, a nurse notes a "sawtooth" pattern on the ECG monitor. This is characteristic of:
A. Atrial Fibrillation
B. Ventricular Tachycardia
🟢 C. Atrial Flutter
D. Sinus Exit Block
🔴 RATIONALE: Atrial flutter is characterized by "F" waves that create a distinct sawtooth or picket-fence
appearance on the baseline.
4. Which of the following is the most appropriate initial intervention for a patient in Pulseless Ventricular
Tachycardia?
A. Synchronized Cardioversion
B. Administration of Atropine
🟢 C. Immediate Defibrillation
D. Administration of Magnesium Sulfate
, 🔴 RATIONALE: Pulseless Ventricular Tachycardia is a shockable rhythm; per ACLS guidelines, immediate
defibrillation is the priority.
5. A PR interval is measured from the:
🟢 A. Beginning of the P wave to the beginning of the QRS complex
B. Peak of the P wave to the R wave
C. End of the P wave to the start of the QRS
D. Beginning of the P wave to the end of the P wave
🔴 RATIONALE: The PR interval represents the time from atrial depolarization to the start of ventricular
depolarization.
6. Failure to sense in a permanent pacemaker is identified on an ECG by:
A. Pacing spikes not followed by a QRS complex
B. Absence of pacing spikes where they should be
🟢 C. Pacing spikes occurring within the patient's own QRS complex
D. A wide QRS complex following every spike
🔴 RATIONALE: Failure to sense occurs when the pacemaker does not detect the heart's intrinsic activity and
fires inappropriately.
7. Which electrolyte imbalance is most commonly associated with the presence of a U wave on an ECG?
A. Hyperkalemia
🟢 B. Hypokalemia
C. Hypercalcemia
D. Hyponatremia
