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 before each QRS and normal 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:
Normal sinus rhythm originates from the SA node, which is the
heart’s primary pacemaker. The presence of upright P waves
before each QRS confirms atrial depolarization from the SA
node.
• A: AV node delays conduction, not initiates it
• C/D: These conduct impulses, not generate primary
rhythm
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a regular rhythm at 88 bpm with consistent P
waves preceding each QRS. Which pathway correctly describes
the electrical conduction seen on this ECG?
A. AV node → SA node → ventricles
B. SA node → AV node → bundle branches → Purkinje fibers
C. Purkinje fibers → bundle branches → SA node
D. Ventricles → atria → 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, producing coordinated ventricular
depolarization.
• Other options show incorrect sequencing
Source: Chapter 1
Question 3
An ECG rhythm strip shows normal sinus rhythm. Which
mechanical event corresponds to the P wave observed?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. AV valve closure
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which precedes
atrial contraction and blood movement into the ventricles.
• A: QRS complex
• C: T wave
• D: Mechanical, not electrical event
Source: 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 before each QRS and normal 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:
Normal sinus rhythm originates from the SA node, which is the
heart’s primary pacemaker. The presence of upright P waves
before each QRS confirms atrial depolarization from the SA
node.
• A: AV node delays conduction, not initiates it
• C/D: These conduct impulses, not generate primary
rhythm
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a regular rhythm at 88 bpm with consistent P
waves preceding each QRS. Which pathway correctly describes
the electrical conduction seen on this ECG?
A. AV node → SA node → ventricles
B. SA node → AV node → bundle branches → Purkinje fibers
C. Purkinje fibers → bundle branches → SA node
D. Ventricles → atria → 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, producing coordinated ventricular
depolarization.
• Other options show incorrect sequencing
Source: Chapter 1
Question 3
An ECG rhythm strip shows normal sinus rhythm. Which
mechanical event corresponds to the P wave observed?
A. Ventricular contraction
B. Atrial depolarization
C. Ventricular repolarization
D. AV valve closure
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which precedes
atrial contraction and blood movement into the ventricles.
• A: QRS complex
• C: T wave
• D: Mechanical, not electrical event
Source: Chapter 1
