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 upright
P waves preceding each QRS complex and consistent PR
intervals. Which cardiac structure is primarily responsible for
initiating this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
A regular rhythm with normal P waves before each QRS
indicates sinus rhythm, originating from the SA node, the
heart’s primary pacemaker.
• A: AV node delays conduction, not initiates it.
• C & D: These are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a normal sinus rhythm. Which pathway
correctly represents electrical conduction from atria to
ventricles?
A. SA node → Bundle branches → AV node → Purkinje fibers
B. SA node → AV node → Bundle of His → Bundle branches →
Purkinje fibers
C. AV node → SA node → Bundle of His → ventricles
D. Purkinje fibers → 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.
, • A, C, D: Incorrect sequence disrupts normal conduction
pattern.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a prolonged PR interval (>0.20 seconds)
with regular rhythm. Which structure is most associated with
this delay?
A. SA node
B. AV node
C. Ventricular myocardium
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction through the AV node. A
prolonged PR interval indicates delayed conduction at this
level.
• A: Initiates impulse, not delay site
• C & D: Affect QRS, not PR interval
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 upright
P waves preceding each QRS complex and consistent PR
intervals. Which cardiac structure is primarily responsible for
initiating this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
A regular rhythm with normal P waves before each QRS
indicates sinus rhythm, originating from the SA node, the
heart’s primary pacemaker.
• A: AV node delays conduction, not initiates it.
• C & D: These are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a normal sinus rhythm. Which pathway
correctly represents electrical conduction from atria to
ventricles?
A. SA node → Bundle branches → AV node → Purkinje fibers
B. SA node → AV node → Bundle of His → Bundle branches →
Purkinje fibers
C. AV node → SA node → Bundle of His → ventricles
D. Purkinje fibers → 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.
, • A, C, D: Incorrect sequence disrupts normal conduction
pattern.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a prolonged PR interval (>0.20 seconds)
with regular rhythm. Which structure is most associated with
this delay?
A. SA node
B. AV node
C. Ventricular myocardium
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction through the AV node. A
prolonged PR interval indicates delayed conduction at this
level.
• A: Initiates impulse, not delay site
• C & D: Affect QRS, not PR interval
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
