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
An ECG shows a regular rhythm at 72 bpm with upright P waves
preceding each QRS complex and a consistent PR interval of
0.16 seconds. Which structure initiates this rhythm?
A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale:
The presence of upright P waves before each QRS and a normal
,PR interval indicates impulse initiation from the SA node, the
heart’s primary pacemaker. The AV node delays conduction but
does not normally initiate impulses. The Bundle of His and
Purkinje fibers conduct impulses but do not initiate normal
sinus rhythm.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm strip shows a heart rate of 60 bpm with a
normal P-QRS-T sequence. Which cardiac structure is
responsible for delaying the impulse before ventricular
contraction?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse, allowing ventricular
filling before contraction. This delay is reflected in the PR
interval. The SA node initiates the impulse, while bundle
branches and Purkinje fibers conduct impulses through the
ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
, Question 3
A patient’s ECG demonstrates normal sinus rhythm. Which
pathway correctly describes the flow of electrical conduction
corresponding to this rhythm?
A. AV node → SA node → ventricles
B. SA node → AV node → Bundle of His → Purkinje fibers
C. Purkinje fibers → Bundle branches → SA node
D. Bundle of His → AV node → atria
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels to the AV
node, then through the Bundle of His, bundle branches, and
Purkinje fibers. This sequence ensures coordinated atrial then
ventricular contraction. Other options incorrectly sequence
conduction.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows consistent P waves followed by QRS complexes.
Which mechanical event corresponds to the P wave?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. AV valve closure
Correct Answer: B
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
An ECG shows a regular rhythm at 72 bpm with upright P waves
preceding each QRS complex and a consistent PR interval of
0.16 seconds. Which structure initiates this rhythm?
A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale:
The presence of upright P waves before each QRS and a normal
,PR interval indicates impulse initiation from the SA node, the
heart’s primary pacemaker. The AV node delays conduction but
does not normally initiate impulses. The Bundle of His and
Purkinje fibers conduct impulses but do not initiate normal
sinus rhythm.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm strip shows a heart rate of 60 bpm with a
normal P-QRS-T sequence. Which cardiac structure is
responsible for delaying the impulse before ventricular
contraction?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse, allowing ventricular
filling before contraction. This delay is reflected in the PR
interval. The SA node initiates the impulse, while bundle
branches and Purkinje fibers conduct impulses through the
ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
, Question 3
A patient’s ECG demonstrates normal sinus rhythm. Which
pathway correctly describes the flow of electrical conduction
corresponding to this rhythm?
A. AV node → SA node → ventricles
B. SA node → AV node → Bundle of His → Purkinje fibers
C. Purkinje fibers → Bundle branches → SA node
D. Bundle of His → AV node → atria
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels to the AV
node, then through the Bundle of His, bundle branches, and
Purkinje fibers. This sequence ensures coordinated atrial then
ventricular contraction. Other options incorrectly sequence
conduction.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows consistent P waves followed by QRS complexes.
Which mechanical event corresponds to the P wave?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. AV valve closure
Correct Answer: B
