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 rhythm shows a regular rate of 72 bpm, upright P waves
preceding each QRS complex, and consistent PR intervals.
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 heart’s primary pacemaker and initiates
,normal sinus rhythm. The ECG shows normal sinus
characteristics: upright P waves, consistent PR intervals, and
regular rhythm.
• 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 tracing shows a delay between atrial and ventricular
depolarization, reflected as a prolonged PR interval. Which
cardiac structure is primarily responsible for this delay?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node slows conduction, allowing time for ventricular
filling. This delay appears as the PR interval on ECG.
• A initiates impulses but does not delay conduction.
• C and D rapidly conduct impulses and do not create delay.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG shows a regular rhythm with each QRS complex
following a P wave. Which phase of cardiac conduction is
represented by the QRS complex?
A. Atrial depolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial repolarization
Correct Answer: B
Rationale:
The QRS complex represents ventricular depolarization.
• A is represented by the P wave.
• C corresponds to the T wave.
• D occurs but is hidden within the QRS complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG demonstrates a T wave following each QRS complex.
What does the T wave represent?
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 rhythm shows a regular rate of 72 bpm, upright P waves
preceding each QRS complex, and consistent PR intervals.
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 heart’s primary pacemaker and initiates
,normal sinus rhythm. The ECG shows normal sinus
characteristics: upright P waves, consistent PR intervals, and
regular rhythm.
• 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 tracing shows a delay between atrial and ventricular
depolarization, reflected as a prolonged PR interval. Which
cardiac structure is primarily responsible for this delay?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node slows conduction, allowing time for ventricular
filling. This delay appears as the PR interval on ECG.
• A initiates impulses but does not delay conduction.
• C and D rapidly conduct impulses and do not create delay.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG shows a regular rhythm with each QRS complex
following a P wave. Which phase of cardiac conduction is
represented by the QRS complex?
A. Atrial depolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial repolarization
Correct Answer: B
Rationale:
The QRS complex represents ventricular depolarization.
• A is represented by the P wave.
• C corresponds to the T wave.
• D occurs but is hidden within the QRS complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG demonstrates a T wave following each QRS complex.
What does the T wave represent?
