Basic Arrhythmia Recognition Course Exam | Complete
Practice Questions, Correct Answers & Detailed
Rationales 2026/2027
Question 1
What is the normal heart rate range for a Normal Sinus Rhythm (NSR) in
an adult?
A. 60 to 100 beats per minute
B. 40 to 60 beats per minute
C. 100 to 150 beats per minute
D. Less than 60 beats per minute
Correct Answer: A. 60 to 100 beats per minute
Detailed Rationale: A Normal Sinus Rhythm originates in the sinoatrial
(SA) node and is characterized by a regular rate of 60 to 100 bpm,
normal upright P waves preceding every narrow QRS complex, and a
normal PR interval.
Question 2
What is the normal duration of the PR interval on a standard 12-lead
ECG?
A. 0.12 to 0.20 seconds (3 to 5 small boxes)
B. 0.04 to 0.10 seconds
C. 0.20 to 0.40 seconds
,D. 0.50 to 0.60 seconds
Correct Answer: A. 0.12 to 0.20 seconds (3 to 5 small boxes)
Detailed Rationale: The PR interval measures the time from the onset
of atrial depolarization to the onset of ventricular depolarization.
Normal duration spans 3 to 5 small horizontal boxes on ECG paper.
Question 3
What is the normal duration of a narrow QRS complex representing
ventricular depolarization?
A. Less than 0.12 seconds (up to 3 small boxes)
B. Exactly 0.20 seconds
C. 0.30 to 0.45 seconds
D. Greater than 0.12 seconds
Correct Answer: A. Less than 0.12 seconds (up to 3 small boxes)
Detailed Rationale: A normal QRS complex duration of less than 0.12
seconds indicates that ventricular activation occurs rapidly through the
normal specialized conduction system (Bundle of His and Purkinje
fibers).
Question 4
Which of the following ECG characteristics defines Sinus Bradycardia?
A. Regular sinus rhythm with a heart rate of less than 60 beats per
minute
B. Irregular rhythm with a heart rate greater than 100 beats per minute
C. Absent P waves with a chaotic baseline
,D. Wide QRS complexes with a rate of 120 beats per minute
Correct Answer: A. Regular sinus rhythm with a heart rate of less than
60 beats per minute
Detailed Rationale: Sinus bradycardia shares all the normal features of
sinus rhythm (upright P waves, normal intervals) except that the
ventricular rate falls below 60 bpm.
Question 5
What defines Sinus Tachycardia on an electrocardiogram strip?
A. Normal sinus rhythm with a heart rate between 100 and 150 beats
per minute
B. Heart rate below 60 beats per minute with inverted P waves
C. Chaotic rhythm with no identifiable P waves
D. Heart rate over 200 beats per minute with wide QRS complexes
Correct Answer: A. Normal sinus rhythm with a heart rate between 100
and 150 beats per minute
Detailed Rationale: Sinus tachycardia originates from the SA node with
normal morphology but accelerates to a rate between 100 and 150 bpm
in response to exercise, fever, stress, or sympathetic stimulation.
Question 6
Which key feature distinguishes Atrial Fibrillation (AFib) on an ECG
rhythm strip?
A. Irregularly irregular ventricular rhythm with absent discrete P waves
and fibrillatory baseline waves
, B. Regular rhythm with sawtooth flutter waves at 300 bpm
C. Prolonged PR intervals exceeding 0.24 seconds
D. Wide QRS complexes followed by inverted T waves
Correct Answer: A. Irregularly irregular ventricular rhythm with absent
discrete P waves and fibrillatory baseline waves
Detailed Rationale: Atrial fibrillation is characterized by chaotic,
uncoordinated atrial electrical activity, resulting in an irregularly
irregular ventricular response and undulating fibrillatory (f) baseline
waves without clear P waves.
Question 7
What classic ECG pattern is observed in Atrial Flutter?
A. Sawtooth or picket-fence flutter waves (F waves) with a regular or
irregular ventricular response
B. Completely chaotic baseline with no organized electrical activity
C. Inverted P waves occurring after the QRS complex
D. Widened QRS complexes exceeding 0.16 seconds
Correct Answer: A. Sawtooth or picket-fence flutter waves (F waves)
with a regular or irregular ventricular response
Detailed Rationale: Atrial flutter features distinct sawtooth or flutter
waves typically occurring at an atrial rate around 300 bpm, often with
variable AV nodal conduction blocks (e.g., 2:1, 3:1).
Question 8
Practice Questions, Correct Answers & Detailed
Rationales 2026/2027
Question 1
What is the normal heart rate range for a Normal Sinus Rhythm (NSR) in
an adult?
A. 60 to 100 beats per minute
B. 40 to 60 beats per minute
C. 100 to 150 beats per minute
D. Less than 60 beats per minute
Correct Answer: A. 60 to 100 beats per minute
Detailed Rationale: A Normal Sinus Rhythm originates in the sinoatrial
(SA) node and is characterized by a regular rate of 60 to 100 bpm,
normal upright P waves preceding every narrow QRS complex, and a
normal PR interval.
Question 2
What is the normal duration of the PR interval on a standard 12-lead
ECG?
A. 0.12 to 0.20 seconds (3 to 5 small boxes)
B. 0.04 to 0.10 seconds
C. 0.20 to 0.40 seconds
,D. 0.50 to 0.60 seconds
Correct Answer: A. 0.12 to 0.20 seconds (3 to 5 small boxes)
Detailed Rationale: The PR interval measures the time from the onset
of atrial depolarization to the onset of ventricular depolarization.
Normal duration spans 3 to 5 small horizontal boxes on ECG paper.
Question 3
What is the normal duration of a narrow QRS complex representing
ventricular depolarization?
A. Less than 0.12 seconds (up to 3 small boxes)
B. Exactly 0.20 seconds
C. 0.30 to 0.45 seconds
D. Greater than 0.12 seconds
Correct Answer: A. Less than 0.12 seconds (up to 3 small boxes)
Detailed Rationale: A normal QRS complex duration of less than 0.12
seconds indicates that ventricular activation occurs rapidly through the
normal specialized conduction system (Bundle of His and Purkinje
fibers).
Question 4
Which of the following ECG characteristics defines Sinus Bradycardia?
A. Regular sinus rhythm with a heart rate of less than 60 beats per
minute
B. Irregular rhythm with a heart rate greater than 100 beats per minute
C. Absent P waves with a chaotic baseline
,D. Wide QRS complexes with a rate of 120 beats per minute
Correct Answer: A. Regular sinus rhythm with a heart rate of less than
60 beats per minute
Detailed Rationale: Sinus bradycardia shares all the normal features of
sinus rhythm (upright P waves, normal intervals) except that the
ventricular rate falls below 60 bpm.
Question 5
What defines Sinus Tachycardia on an electrocardiogram strip?
A. Normal sinus rhythm with a heart rate between 100 and 150 beats
per minute
B. Heart rate below 60 beats per minute with inverted P waves
C. Chaotic rhythm with no identifiable P waves
D. Heart rate over 200 beats per minute with wide QRS complexes
Correct Answer: A. Normal sinus rhythm with a heart rate between 100
and 150 beats per minute
Detailed Rationale: Sinus tachycardia originates from the SA node with
normal morphology but accelerates to a rate between 100 and 150 bpm
in response to exercise, fever, stress, or sympathetic stimulation.
Question 6
Which key feature distinguishes Atrial Fibrillation (AFib) on an ECG
rhythm strip?
A. Irregularly irregular ventricular rhythm with absent discrete P waves
and fibrillatory baseline waves
, B. Regular rhythm with sawtooth flutter waves at 300 bpm
C. Prolonged PR intervals exceeding 0.24 seconds
D. Wide QRS complexes followed by inverted T waves
Correct Answer: A. Irregularly irregular ventricular rhythm with absent
discrete P waves and fibrillatory baseline waves
Detailed Rationale: Atrial fibrillation is characterized by chaotic,
uncoordinated atrial electrical activity, resulting in an irregularly
irregular ventricular response and undulating fibrillatory (f) baseline
waves without clear P waves.
Question 7
What classic ECG pattern is observed in Atrial Flutter?
A. Sawtooth or picket-fence flutter waves (F waves) with a regular or
irregular ventricular response
B. Completely chaotic baseline with no organized electrical activity
C. Inverted P waves occurring after the QRS complex
D. Widened QRS complexes exceeding 0.16 seconds
Correct Answer: A. Sawtooth or picket-fence flutter waves (F waves)
with a regular or irregular ventricular response
Detailed Rationale: Atrial flutter features distinct sawtooth or flutter
waves typically occurring at an atrial rate around 300 bpm, often with
variable AV nodal conduction blocks (e.g., 2:1, 3:1).
Question 8
