SPRING SEMESTER 2026 – RELIAS ECG &
ARRHYTHMIA INTERPRETATION PRACTICE
EXAM | 180+ NCLEX-STYLE QUESTIONS WITH
VERIFIED ANSWERS & DETAILED RATIONALES
| CARDIAC RHYTHMS, ECG WAVEFORM
ANALYSIS, ARRHYTHMIA IDENTIFICATION,
PACEMAKER MANAGEMENT, ACLS BASICS &
NURSING CLINICAL APPLICATION
1. What is the normal range for a PR interval on an ECG?
A) 0.12 - 0.20 seconds
B) 0.20 - 0.25 seconds
C) 0.08 - 0.12 seconds
D) 0.25 - 0.30 seconds
CORRECT OPTION: A) 0.12 - 0.20 seconds
RATIONALE: The PR interval represents the time taken for electrical impulses to travel from
the atria to the ventricles. A normal PR interval ranges from 0.12 to 0.20 seconds.
2. Which of the following rhythms is characterized by absent P waves and an irregularly
irregular rhythm?
A) Atrial Fibrillation
B) Sinus Bradycardia
C) Ventricular Tachycardia
D) Atrial Flutter
CORRECT OPTION: A) Atrial Fibrillation
RATIONALE: Atrial fibrillation is identified by the absence of discernible P waves and an
irregular ventricular response, resulting in an irregularly irregular rhythm.
3. In what situation would you typically employ a transcutaneous pacemaker?
A) Rapid ventricular response to atrial flutter
,B) Symptomatic bradycardia
C) Ventricular fibrillation
D) Sinus tachycardia
CORRECT OPTION: B) Symptomatic bradycardia
RATIONALE: Transcutaneous pacing is indicated for symptomatic bradycardia when
immediate intervention is required to improve cardiac output.
4. Which of the following is a characteristic of ventricular tachycardia (VT)?
A) Narrow QRS complexes
B) Regular rhythm
C) Presence of P waves
D) Heart rate less than 100 bpm
CORRECT OPTION: B) Regular rhythm
RATIONALE: Ventricular tachycardia typically presents with a regular, rapid heart rhythm
and wide QRS complexes.
5. What does a U wave typically represent on an ECG?
A) Atrial depolarization
B) Ventricular repolarization
C) Delayed electrical activity in the ventricles
D) Atrial contraction
CORRECT OPTION: B) Ventricular repolarization
RATIONALE: The U wave is believed to represent the repolarization of the Purkinje fibers
and is more pronounced in certain electrolyte imbalances.
6. Which of the following is an indication for administering adenosine?
A) Atrial flutter
B) Uncontrolled hypertension
,C) Supraventricular tachycardia (SVT)
D) Ventricular fibrillation
CORRECT OPTION: C) Supraventricular tachycardia (SVT)
RATIONALE: Adenosine is commonly used to terminate SVT by slowing conduction through
the AV node.
7. What heart rate is classified as bradycardia?
A) Less than 60 bpm
B) Less than 70 bpm
C) Less than 80 bpm
D) Less than 100 bpm
CORRECT OPTION: A) Less than 60 bpm
RATIONALE: Bradycardia is defined as a heart rate that is less than 60 beats per minute.
8. What is the primary treatment for acidosis-induced hyperkalemia?
A) Sodium bicarbonate
B) Calcium chloride
C) Albuterol
D) Insulin
CORRECT OPTION: A) Sodium bicarbonate
RATIONALE: Sodium bicarbonate is used to correct acidosis and can help shift potassium
back into cells, lowering serum potassium levels.
9. Which lead is most commonly used to assess the ST segment for myocardial ischemia?
A) Lead I
B) Lead II
C) Lead V1
, D) Lead V5
CORRECT OPTION: D) Lead V5
RATIONALE: Lead V5 is often used for ST-segment analysis because it provides a clear view
of the left lateral wall of the heart, where ischemia is commonly assessed.
10. What rhythm is characterized by "sawtooth" P waves?
A) Atrial fibrillation
B) Atrial flutter
C) Ventricular fibrillation
D) Sinus tachycardia
CORRECT OPTION: B) Atrial flutter
RATIONALE: Atrial flutter is characterized by "sawtooth" patterns of P waves, often
described as "F-waves."
11. What is the primary intervention for a patient experiencing a myocardial infarction?
A) Beta blocker administration
B) Administering aspirin
C) Administering nitroglycerin
D) Oxygen therapy
CORRECT OPTION: B) Administering aspirin
RATIONALE: Aspirin is crucial in the management of myocardial infarction as it reduces
platelet aggregation and thrombus formation.
12. Which pacemaker mode is most commonly used in patients with symptomatic
bradycardia?
A) Demand mode
B) Fixed mode
C) Rate-responsive mode
ARRHYTHMIA INTERPRETATION PRACTICE
EXAM | 180+ NCLEX-STYLE QUESTIONS WITH
VERIFIED ANSWERS & DETAILED RATIONALES
| CARDIAC RHYTHMS, ECG WAVEFORM
ANALYSIS, ARRHYTHMIA IDENTIFICATION,
PACEMAKER MANAGEMENT, ACLS BASICS &
NURSING CLINICAL APPLICATION
1. What is the normal range for a PR interval on an ECG?
A) 0.12 - 0.20 seconds
B) 0.20 - 0.25 seconds
C) 0.08 - 0.12 seconds
D) 0.25 - 0.30 seconds
CORRECT OPTION: A) 0.12 - 0.20 seconds
RATIONALE: The PR interval represents the time taken for electrical impulses to travel from
the atria to the ventricles. A normal PR interval ranges from 0.12 to 0.20 seconds.
2. Which of the following rhythms is characterized by absent P waves and an irregularly
irregular rhythm?
A) Atrial Fibrillation
B) Sinus Bradycardia
C) Ventricular Tachycardia
D) Atrial Flutter
CORRECT OPTION: A) Atrial Fibrillation
RATIONALE: Atrial fibrillation is identified by the absence of discernible P waves and an
irregular ventricular response, resulting in an irregularly irregular rhythm.
3. In what situation would you typically employ a transcutaneous pacemaker?
A) Rapid ventricular response to atrial flutter
,B) Symptomatic bradycardia
C) Ventricular fibrillation
D) Sinus tachycardia
CORRECT OPTION: B) Symptomatic bradycardia
RATIONALE: Transcutaneous pacing is indicated for symptomatic bradycardia when
immediate intervention is required to improve cardiac output.
4. Which of the following is a characteristic of ventricular tachycardia (VT)?
A) Narrow QRS complexes
B) Regular rhythm
C) Presence of P waves
D) Heart rate less than 100 bpm
CORRECT OPTION: B) Regular rhythm
RATIONALE: Ventricular tachycardia typically presents with a regular, rapid heart rhythm
and wide QRS complexes.
5. What does a U wave typically represent on an ECG?
A) Atrial depolarization
B) Ventricular repolarization
C) Delayed electrical activity in the ventricles
D) Atrial contraction
CORRECT OPTION: B) Ventricular repolarization
RATIONALE: The U wave is believed to represent the repolarization of the Purkinje fibers
and is more pronounced in certain electrolyte imbalances.
6. Which of the following is an indication for administering adenosine?
A) Atrial flutter
B) Uncontrolled hypertension
,C) Supraventricular tachycardia (SVT)
D) Ventricular fibrillation
CORRECT OPTION: C) Supraventricular tachycardia (SVT)
RATIONALE: Adenosine is commonly used to terminate SVT by slowing conduction through
the AV node.
7. What heart rate is classified as bradycardia?
A) Less than 60 bpm
B) Less than 70 bpm
C) Less than 80 bpm
D) Less than 100 bpm
CORRECT OPTION: A) Less than 60 bpm
RATIONALE: Bradycardia is defined as a heart rate that is less than 60 beats per minute.
8. What is the primary treatment for acidosis-induced hyperkalemia?
A) Sodium bicarbonate
B) Calcium chloride
C) Albuterol
D) Insulin
CORRECT OPTION: A) Sodium bicarbonate
RATIONALE: Sodium bicarbonate is used to correct acidosis and can help shift potassium
back into cells, lowering serum potassium levels.
9. Which lead is most commonly used to assess the ST segment for myocardial ischemia?
A) Lead I
B) Lead II
C) Lead V1
, D) Lead V5
CORRECT OPTION: D) Lead V5
RATIONALE: Lead V5 is often used for ST-segment analysis because it provides a clear view
of the left lateral wall of the heart, where ischemia is commonly assessed.
10. What rhythm is characterized by "sawtooth" P waves?
A) Atrial fibrillation
B) Atrial flutter
C) Ventricular fibrillation
D) Sinus tachycardia
CORRECT OPTION: B) Atrial flutter
RATIONALE: Atrial flutter is characterized by "sawtooth" patterns of P waves, often
described as "F-waves."
11. What is the primary intervention for a patient experiencing a myocardial infarction?
A) Beta blocker administration
B) Administering aspirin
C) Administering nitroglycerin
D) Oxygen therapy
CORRECT OPTION: B) Administering aspirin
RATIONALE: Aspirin is crucial in the management of myocardial infarction as it reduces
platelet aggregation and thrombus formation.
12. Which pacemaker mode is most commonly used in patients with symptomatic
bradycardia?
A) Demand mode
B) Fixed mode
C) Rate-responsive mode
