ECG Workout
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,TEST BANK
Table of Contents — ECG Workout: Exercises in Arrhythmia Interpretation, 8th Edition
1. Anatomy and Physiology of the Heart
2. Electrophysiology
3. Waveforms, Complexes, Intervals, and Segments
4. Cardiac Monitors
5. Analyzing a Rhythm Strip
6. Sinus Rhythms
7. Atrial Rhythms
8. Junctional Rhythms and AV Blocks
9. Ventricular Rhythms and Bundle-Branch Block
10. Pacemakers
11. Posttes
Question 1
A patient’s ECG shows a regular rhythm at 72 bpm, each QRS
complex is preceded by a uniform upright P wave, and PR
intervals are consistent. Which cardiac structure is responsible
for initiating this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
,Correct Answer: B
Rationale:
The SA node is the primary pacemaker of the heart and initiates
impulses that produce a normal sinus rhythm (regular rate 60–
100 bpm, upright P waves preceding each QRS).
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are conduction pathways, not primary pacemakers
under normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm strip shows a normal sinus rhythm at 80 bpm.
The impulse travels from the atria to the ventricles, reflected by
which ECG interval?
A. QRS duration
B. PR interval
C. QT interval
D. ST segment
Correct Answer: B
Rationale:
The PR interval represents the time required for the impulse to
travel from the atria through the AV node to the ventricles.
, • A reflects ventricular depolarization.
• C represents total ventricular activity.
• D represents early ventricular repolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm. Which part of the
conduction system ensures a delay before ventricular
contraction, allowing optimal ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse before it enters the
ventricles, allowing time for ventricular filling. This delay is
reflected in the PR interval.
• A initiates the impulse.
• C and D conduct impulses rapidly through ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,TEST BANK
Table of Contents — ECG Workout: Exercises in Arrhythmia Interpretation, 8th Edition
1. Anatomy and Physiology of the Heart
2. Electrophysiology
3. Waveforms, Complexes, Intervals, and Segments
4. Cardiac Monitors
5. Analyzing a Rhythm Strip
6. Sinus Rhythms
7. Atrial Rhythms
8. Junctional Rhythms and AV Blocks
9. Ventricular Rhythms and Bundle-Branch Block
10. Pacemakers
11. Posttes
Question 1
A patient’s ECG shows a regular rhythm at 72 bpm, each QRS
complex is preceded by a uniform upright P wave, and PR
intervals are consistent. Which cardiac structure is responsible
for initiating this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
,Correct Answer: B
Rationale:
The SA node is the primary pacemaker of the heart and initiates
impulses that produce a normal sinus rhythm (regular rate 60–
100 bpm, upright P waves preceding each QRS).
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are conduction pathways, not primary pacemakers
under normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm strip shows a normal sinus rhythm at 80 bpm.
The impulse travels from the atria to the ventricles, reflected by
which ECG interval?
A. QRS duration
B. PR interval
C. QT interval
D. ST segment
Correct Answer: B
Rationale:
The PR interval represents the time required for the impulse to
travel from the atria through the AV node to the ventricles.
, • A reflects ventricular depolarization.
• C represents total ventricular activity.
• D represents early ventricular repolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm. Which part of the
conduction system ensures a delay before ventricular
contraction, allowing optimal ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse before it enters the
ventricles, allowing time for ventricular filling. This delay is
reflected in the PR interval.
• A initiates the impulse.
• C and D conduct impulses rapidly through ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
