Back-to-School September 2025/2026 | Advanced
Dysrhythmia Clinical Assessment Test Bank | 200+
Verified ECG Interpretation Practice Questions with
Correct Answers & Detailed Rationales |
Comprehensive Study Guide on Cardiac Rhythms,
Arrhythmias & Nursing Interventions | RN, BSN &
NCLEX Exam Prep
Question 1
A patient presents with an irregularly irregular pulse at a rate of 120 bpm. An ECG
shows no distinct P waves. What is the most likely dysrhythmia?
A) Ventricular Tachycardia
B) Atrial Fibrillation (Correct)
C) Sinus Tachycardia
D) Atrial Flutter
Rationale: Atrial fibrillation is characterized by an irregularly irregular rhythm with no
distinct P waves, leading to a rapid ventricular response.
Question 2
A patient in the emergency department is in ventricular fibrillation. What is the priority
nursing intervention?
A) Administer amiodarone
B) Initiate defibrillation (Correct)
C) Start CPR
D) Administer atropine
Rationale: Defibrillation is the immediate treatment for ventricular fibrillation to restore
a normal rhythm.
Question 3
A patient with bradycardia is experiencing dizziness and fatigue. What is the most
appropriate initial intervention?
A) Administer digoxin
B) Apply oxygen (Correct)
C) Start IV fluids
D) Prepare for a pacemaker insertion
Rationale: Administering oxygen can help alleviate symptoms related to decreased
perfusion in bradycardic patients, while further assessment and potential pacing may be
required.
,Question 4
When assessing a patient with suspected atrial flutter, which characteristic would you
expect to find on the ECG?
A) Sawtooth waves in the atrial leads (Correct)
B) Wide QRS complexes
C) Irregularly timed P waves
D) No identifiable P waves
Rationale: Atrial flutter is characterized by sawtooth patterns (F-waves) in the atrial
leads, commonly referred to as "flutter waves."
Question 5
A patient presents with a heart rate of 150 bpm and a regular rhythm. The QRS complex
is wide (>0.12 seconds). What dysrhythmia should the nurse suspect?
A) Atrial Fibrillation
B) Ventricular Tachycardia (Correct)
C) Sinus Tachycardia
D) Supraventricular Tachycardia
Rationale: A ventricular tachycardia is indicated by a regular rhythm, a heart rate of
150 bpm, and a wide QRS complex.
Question 6
A patient undergoing telemetry monitoring is noted to have frequent PVCs (premature
ventricular contractions). What is the priority nursing action?
A) Assess for symptoms of decreased perfusion (Correct)
B) Increase the patient's fluid intake
C) Prepare for defibrillation
D) Administer beta-blockers
Rationale: Assessing for symptoms is crucial, as frequent PVCs can lead to more
serious arrhythmias and may indicate decreased cardiac output.
Question 7
A patient is diagnosed with atrial fibrillation and has been prescribed anticoagulants.
What is the primary reason for this medication?
,A) To decrease heart rate
B) To prevent thromboembolism (Correct)
C) To restore sinus rhythm
D) To manage hypertension
Rationale: Anticoagulants are prescribed to prevent blood clots that can lead to strokes
in patients with atrial fibrillation.
Question 8
A patient in sinus tachycardia has a heart rate of 110 bpm. What is the most likely cause
of this dysrhythmia?
A) Hyperkalemia
B) Pain or anxiety (Correct)
C) Increased vagal tone
D) Hypothermia
Rationale: Sinus tachycardia is often a physiological response to stressors such as pain
or anxiety, leading to increased heart rate.
Question 9
During an ECG assessment, you notice a prolonged QT interval. What is the most
serious potential complication of this finding?
A) Atrial Fibrillation
B) Torsades de Pointes (Correct)
C) Ventricular Bradycardia
D) Sinus Tachycardia
Rationale: A prolonged QT interval can lead to Torsades de Pointes, a potentially life-
threatening form of polymorphic ventricular tachycardia.
Question 10
A patient with heart failure is experiencing frequent PACs (premature atrial
contractions). What is the priority nursing intervention?
A) Increase fluid intake
B) Monitor for signs of worsening heart failure (Correct)
C) Administer antiarrhythmic medications
D) Prepare for cardioversion
Rationale: Monitoring for signs of worsening heart failure is crucial, as PACs can
indicate increased cardiac workload.
, Question 11
A patient is being monitored for dysrhythmias after undergoing cardiac surgery. What is
the most important assessment to perform?
A) Monitor blood glucose levels
B) Continuous ECG monitoring (Correct)
C) Assess peripheral pulses
D) Measure urine output
Rationale: Continuous ECG monitoring is essential for early detection of dysrhythmias
post-surgery, which can be life-threatening.
Question 12
A patient presents with a heart rate of 40 bpm, and the ECG shows a regular rhythm
with no P waves. What is the most likely dysrhythmia?
A) Atrial Fibrillation
B) Third-Degree Heart Block (Correct)
C) Ventricular Tachycardia
D) Sinus Bradycardia
Rationale: A heart rate of 40 bpm with no P waves suggests a complete heart block
(third-degree heart block).
Question 13
A patient in ventricular tachycardia is unresponsive and pulseless. What is the
immediate nursing action?
A) Start CPR (Correct)
B) Administer antiarrhythmic medication
C) Prepare for defibrillation
D) Assess for a pulse
Rationale: Starting CPR is essential for a pulseless patient to maintain circulation until
defibrillation can be performed.
Question 14
A patient with a history of heart disease is experiencing rapid and irregular heartbeat.
What is the first step in the nursing assessment?
Dysrhythmia Clinical Assessment Test Bank | 200+
Verified ECG Interpretation Practice Questions with
Correct Answers & Detailed Rationales |
Comprehensive Study Guide on Cardiac Rhythms,
Arrhythmias & Nursing Interventions | RN, BSN &
NCLEX Exam Prep
Question 1
A patient presents with an irregularly irregular pulse at a rate of 120 bpm. An ECG
shows no distinct P waves. What is the most likely dysrhythmia?
A) Ventricular Tachycardia
B) Atrial Fibrillation (Correct)
C) Sinus Tachycardia
D) Atrial Flutter
Rationale: Atrial fibrillation is characterized by an irregularly irregular rhythm with no
distinct P waves, leading to a rapid ventricular response.
Question 2
A patient in the emergency department is in ventricular fibrillation. What is the priority
nursing intervention?
A) Administer amiodarone
B) Initiate defibrillation (Correct)
C) Start CPR
D) Administer atropine
Rationale: Defibrillation is the immediate treatment for ventricular fibrillation to restore
a normal rhythm.
Question 3
A patient with bradycardia is experiencing dizziness and fatigue. What is the most
appropriate initial intervention?
A) Administer digoxin
B) Apply oxygen (Correct)
C) Start IV fluids
D) Prepare for a pacemaker insertion
Rationale: Administering oxygen can help alleviate symptoms related to decreased
perfusion in bradycardic patients, while further assessment and potential pacing may be
required.
,Question 4
When assessing a patient with suspected atrial flutter, which characteristic would you
expect to find on the ECG?
A) Sawtooth waves in the atrial leads (Correct)
B) Wide QRS complexes
C) Irregularly timed P waves
D) No identifiable P waves
Rationale: Atrial flutter is characterized by sawtooth patterns (F-waves) in the atrial
leads, commonly referred to as "flutter waves."
Question 5
A patient presents with a heart rate of 150 bpm and a regular rhythm. The QRS complex
is wide (>0.12 seconds). What dysrhythmia should the nurse suspect?
A) Atrial Fibrillation
B) Ventricular Tachycardia (Correct)
C) Sinus Tachycardia
D) Supraventricular Tachycardia
Rationale: A ventricular tachycardia is indicated by a regular rhythm, a heart rate of
150 bpm, and a wide QRS complex.
Question 6
A patient undergoing telemetry monitoring is noted to have frequent PVCs (premature
ventricular contractions). What is the priority nursing action?
A) Assess for symptoms of decreased perfusion (Correct)
B) Increase the patient's fluid intake
C) Prepare for defibrillation
D) Administer beta-blockers
Rationale: Assessing for symptoms is crucial, as frequent PVCs can lead to more
serious arrhythmias and may indicate decreased cardiac output.
Question 7
A patient is diagnosed with atrial fibrillation and has been prescribed anticoagulants.
What is the primary reason for this medication?
,A) To decrease heart rate
B) To prevent thromboembolism (Correct)
C) To restore sinus rhythm
D) To manage hypertension
Rationale: Anticoagulants are prescribed to prevent blood clots that can lead to strokes
in patients with atrial fibrillation.
Question 8
A patient in sinus tachycardia has a heart rate of 110 bpm. What is the most likely cause
of this dysrhythmia?
A) Hyperkalemia
B) Pain or anxiety (Correct)
C) Increased vagal tone
D) Hypothermia
Rationale: Sinus tachycardia is often a physiological response to stressors such as pain
or anxiety, leading to increased heart rate.
Question 9
During an ECG assessment, you notice a prolonged QT interval. What is the most
serious potential complication of this finding?
A) Atrial Fibrillation
B) Torsades de Pointes (Correct)
C) Ventricular Bradycardia
D) Sinus Tachycardia
Rationale: A prolonged QT interval can lead to Torsades de Pointes, a potentially life-
threatening form of polymorphic ventricular tachycardia.
Question 10
A patient with heart failure is experiencing frequent PACs (premature atrial
contractions). What is the priority nursing intervention?
A) Increase fluid intake
B) Monitor for signs of worsening heart failure (Correct)
C) Administer antiarrhythmic medications
D) Prepare for cardioversion
Rationale: Monitoring for signs of worsening heart failure is crucial, as PACs can
indicate increased cardiac workload.
, Question 11
A patient is being monitored for dysrhythmias after undergoing cardiac surgery. What is
the most important assessment to perform?
A) Monitor blood glucose levels
B) Continuous ECG monitoring (Correct)
C) Assess peripheral pulses
D) Measure urine output
Rationale: Continuous ECG monitoring is essential for early detection of dysrhythmias
post-surgery, which can be life-threatening.
Question 12
A patient presents with a heart rate of 40 bpm, and the ECG shows a regular rhythm
with no P waves. What is the most likely dysrhythmia?
A) Atrial Fibrillation
B) Third-Degree Heart Block (Correct)
C) Ventricular Tachycardia
D) Sinus Bradycardia
Rationale: A heart rate of 40 bpm with no P waves suggests a complete heart block
(third-degree heart block).
Question 13
A patient in ventricular tachycardia is unresponsive and pulseless. What is the
immediate nursing action?
A) Start CPR (Correct)
B) Administer antiarrhythmic medication
C) Prepare for defibrillation
D) Assess for a pulse
Rationale: Starting CPR is essential for a pulseless patient to maintain circulation until
defibrillation can be performed.
Question 14
A patient with a history of heart disease is experiencing rapid and irregular heartbeat.
What is the first step in the nursing assessment?
