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 strip shows a regular rhythm at 72 bpm with
upright P waves before each QRS complex, and a consistent PR
interval. Which structure initiates this electrical activity?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
,C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The presence of upright, consistent P waves preceding each
QRS indicates normal sinus rhythm originating from the SA
node, the heart’s primary pacemaker.
• A is incorrect: AV node delays conduction but does not
initiate normal rhythm.
• C and D are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates normal sinus rhythm. Which phase of
cardiac blood flow corresponds to the P wave?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Passive ventricular filling
Correct Answer: B
, Rationale:
The P wave represents atrial depolarization, which triggers
atrial contraction and contributes to ventricular filling.
• A corresponds to the QRS complex.
• C corresponds to the T wave.
• D occurs partly before atrial contraction but is not
represented by the P wave.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG strip shows a normal PR interval. What mechanical
event occurs during this interval?
A. Closure of semilunar valves
B. Atrial contraction and blood movement into ventricles
C. Ventricular ejection into arteries
D. Ventricular relaxation
Correct Answer: B
Rationale:
The PR interval represents the time from atrial depolarization
to ventricular depolarization, allowing atrial contraction and
blood flow into ventricles.
• A and C occur after ventricular depolarization.
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 strip shows a regular rhythm at 72 bpm with
upright P waves before each QRS complex, and a consistent PR
interval. Which structure initiates this electrical activity?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
,C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The presence of upright, consistent P waves preceding each
QRS indicates normal sinus rhythm originating from the SA
node, the heart’s primary pacemaker.
• A is incorrect: AV node delays conduction but does not
initiate normal rhythm.
• C and D are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates normal sinus rhythm. Which phase of
cardiac blood flow corresponds to the P wave?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Passive ventricular filling
Correct Answer: B
, Rationale:
The P wave represents atrial depolarization, which triggers
atrial contraction and contributes to ventricular filling.
• A corresponds to the QRS complex.
• C corresponds to the T wave.
• D occurs partly before atrial contraction but is not
represented by the P wave.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG strip shows a normal PR interval. What mechanical
event occurs during this interval?
A. Closure of semilunar valves
B. Atrial contraction and blood movement into ventricles
C. Ventricular ejection into arteries
D. Ventricular relaxation
Correct Answer: B
Rationale:
The PR interval represents the time from atrial depolarization
to ventricular depolarization, allowing atrial contraction and
blood flow into ventricles.
• A and C occur after ventricular depolarization.
