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. Posttest
Question 1
An ECG shows a normal sinus rhythm at 72 bpm. The nurse
understands that which structure is responsible for initiating
this electrical activity?
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
the electrical impulse that produces the P wave on the ECG.
The AV node delays conduction, 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 shows consistent P waves before each QRS
complex. This indicates proper conduction through which
cardiac structure?
A. Purkinje fibers
B. Ventricular myocardium
C. Atrioventricular (AV) node
D. Bundle branches
Correct Answer: C
Rationale:
A P wave followed by a QRS complex indicates that the impulse
originated in the atria and successfully passed through the AV
node to the ventricles. The AV node provides the necessary
delay reflected in the PR interval.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG tracing shows a prolonged PR interval. This reflects
delayed conduction through which part of the cardiac
conduction system?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval represents conduction from the atria through
the AV node. A prolonged PR interval indicates delayed
conduction at the AV node. The SA node initiates impulses,
while bundle branches and Purkinje fibers affect the QRS
complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – 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. Posttest
Question 1
An ECG shows a normal sinus rhythm at 72 bpm. The nurse
understands that which structure is responsible for initiating
this electrical activity?
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
the electrical impulse that produces the P wave on the ECG.
The AV node delays conduction, 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 shows consistent P waves before each QRS
complex. This indicates proper conduction through which
cardiac structure?
A. Purkinje fibers
B. Ventricular myocardium
C. Atrioventricular (AV) node
D. Bundle branches
Correct Answer: C
Rationale:
A P wave followed by a QRS complex indicates that the impulse
originated in the atria and successfully passed through the AV
node to the ventricles. The AV node provides the necessary
delay reflected in the PR interval.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG tracing shows a prolonged PR interval. This reflects
delayed conduction through which part of the cardiac
conduction system?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval represents conduction from the atria through
the AV node. A prolonged PR interval indicates delayed
conduction at the AV node. The SA node initiates impulses,
while bundle branches and Purkinje fibers affect the QRS
complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
