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 normal sinus rhythm at 72 bpm. Which
structure is primarily responsible for initiating the electrical
impulse that produces the P wave?
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
atrial depolarization, which appears as the P wave on ECG. The
AV node delays conduction (PR interval), while the Bundle of
His and Purkinje fibers conduct impulses through the ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows a consistent PR interval before each
QRS complex. This interval represents conduction through
which cardiac structure?
A. SA node to atrial myocardium only
B. AV node delay
C. Ventricular repolarization
D. Purkinje fiber conduction
Correct Answer: B
Rationale:
The PR interval reflects the time the impulse travels from the
atria through the AV node. The AV node slows conduction,
allowing ventricular filling. It does not represent repolarization
(T wave) or ventricular conduction (QRS).
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates a normal P wave followed by a
QRS complex. Which mechanical event corresponds to the P
wave?
A. Ventricular contraction
B. Atrial contraction
C. Ventricular relaxation
D. Closure of semilunar valves
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which leads to
atrial contraction. Ventricular contraction corresponds to the
QRS complex, and relaxation is associated with repolarization (T
wave).
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows a normal sinus rhythm. Which valve opens as a
result of atrial contraction following the P wave?
A. Aortic valve
B. Pulmonic valve
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 normal sinus rhythm at 72 bpm. Which
structure is primarily responsible for initiating the electrical
impulse that produces the P wave?
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
atrial depolarization, which appears as the P wave on ECG. The
AV node delays conduction (PR interval), while the Bundle of
His and Purkinje fibers conduct impulses through the ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows a consistent PR interval before each
QRS complex. This interval represents conduction through
which cardiac structure?
A. SA node to atrial myocardium only
B. AV node delay
C. Ventricular repolarization
D. Purkinje fiber conduction
Correct Answer: B
Rationale:
The PR interval reflects the time the impulse travels from the
atria through the AV node. The AV node slows conduction,
allowing ventricular filling. It does not represent repolarization
(T wave) or ventricular conduction (QRS).
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates a normal P wave followed by a
QRS complex. Which mechanical event corresponds to the P
wave?
A. Ventricular contraction
B. Atrial contraction
C. Ventricular relaxation
D. Closure of semilunar valves
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which leads to
atrial contraction. Ventricular contraction corresponds to the
QRS complex, and relaxation is associated with repolarization (T
wave).
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows a normal sinus rhythm. Which valve opens as a
result of atrial contraction following the P wave?
A. Aortic valve
B. Pulmonic valve
