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 with a P
wave before each QRS complex, a PR interval of 0.16 seconds,
and narrow QRS complexes. Which 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
normal sinus rhythm. The ECG shows normal sinus rhythm
characteristics: regular rhythm, rate 60–100 bpm, P wave
before each QRS, and normal PR interval.
• A is incorrect: AV node delays conduction but does not
initiate normal 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. Which
electrical conduction pathway correctly represents the
sequence of impulse flow?
A. AV node → SA node → ventricles
B. SA node → AV node → bundle branches → Purkinje fibers
C. Purkinje fibers → bundle of His → SA node
D. Bundle branches → SA node → AV node
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 produces coordinated atrial and ventricular
contraction.
• Other options show incorrect or reversed conduction
pathways.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal sinus rhythm. Which
mechanical action corresponds to the P wave?
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial depolarization
D. Atrial repolarization
Correct Answer: C
Rationale:
The P wave represents atrial depolarization, which triggers
atrial contraction.
• A corresponds to QRS complex
• B corresponds to T wave
• Atrial repolarization is not visible on ECG
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 with a P
wave before each QRS complex, a PR interval of 0.16 seconds,
and narrow QRS complexes. Which 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
normal sinus rhythm. The ECG shows normal sinus rhythm
characteristics: regular rhythm, rate 60–100 bpm, P wave
before each QRS, and normal PR interval.
• A is incorrect: AV node delays conduction but does not
initiate normal 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. Which
electrical conduction pathway correctly represents the
sequence of impulse flow?
A. AV node → SA node → ventricles
B. SA node → AV node → bundle branches → Purkinje fibers
C. Purkinje fibers → bundle of His → SA node
D. Bundle branches → SA node → AV node
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 produces coordinated atrial and ventricular
contraction.
• Other options show incorrect or reversed conduction
pathways.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal sinus rhythm. Which
mechanical action corresponds to the P wave?
A. Ventricular depolarization
B. Ventricular repolarization
C. Atrial depolarization
D. Atrial repolarization
Correct Answer: C
Rationale:
The P wave represents atrial depolarization, which triggers
atrial contraction.
• A corresponds to QRS complex
• B corresponds to T wave
• Atrial repolarization is not visible on ECG
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
