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 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 normal sinus rhythm originates from the SA node, the heart’s
primary pacemaker. The presence of upright P waves before
each QRS and a regular rate between 60–100 bpm confirms SA
node initiation.
• A: AV node delays conduction but does not initiate normal
rhythm
• C & D: Conduct impulses but do not initiate sinus rhythm
Source: ECG Workout, 8th Edition – Chapter 1
Question 2
An ECG tracing demonstrates a normal sinus rhythm. The nurse
understands that the P wave represents which physiological
event in cardiac conduction?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial repolarization
Correct Answer: B
Rationale:
The P wave reflects atrial depolarization, which occurs when
, the electrical impulse spreads from the SA node through the
atria.
• A: QRS complex
• C: T wave
• D: Not visible on ECG
Source: ECG Workout, 8th Edition – Chapter 1
Question 3
A patient’s ECG shows a consistent PR interval of 0.16 seconds.
This interval represents conduction through which structure?
A. Purkinje fibers
B. Bundle branches
C. AV node
D. Ventricular myocardium
Correct Answer: C
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.
• A & B: Involved in ventricular conduction
• D: Represents QRS activity
Source: ECG Workout, 8th Edition – Chapter 1
Question 4
An ECG rhythm strip shows a narrow QRS complex following
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 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 normal sinus rhythm originates from the SA node, the heart’s
primary pacemaker. The presence of upright P waves before
each QRS and a regular rate between 60–100 bpm confirms SA
node initiation.
• A: AV node delays conduction but does not initiate normal
rhythm
• C & D: Conduct impulses but do not initiate sinus rhythm
Source: ECG Workout, 8th Edition – Chapter 1
Question 2
An ECG tracing demonstrates a normal sinus rhythm. The nurse
understands that the P wave represents which physiological
event in cardiac conduction?
A. Ventricular depolarization
B. Atrial depolarization
C. Ventricular repolarization
D. Atrial repolarization
Correct Answer: B
Rationale:
The P wave reflects atrial depolarization, which occurs when
, the electrical impulse spreads from the SA node through the
atria.
• A: QRS complex
• C: T wave
• D: Not visible on ECG
Source: ECG Workout, 8th Edition – Chapter 1
Question 3
A patient’s ECG shows a consistent PR interval of 0.16 seconds.
This interval represents conduction through which structure?
A. Purkinje fibers
B. Bundle branches
C. AV node
D. Ventricular myocardium
Correct Answer: C
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.
• A & B: Involved in ventricular conduction
• D: Represents QRS activity
Source: ECG Workout, 8th Edition – Chapter 1
Question 4
An ECG rhythm strip shows a narrow QRS complex following
