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 tracing shows a regular rhythm at 72 bpm with upright
P waves preceding each QRS complex and a consistent PR
interval of 0.16 seconds. Which structure initiates this electrical
impulse?
,A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale:
The ECG shows a normal sinus rhythm: regular rate, upright P
waves before each QRS, and normal PR interval. This indicates
impulse initiation from the SA node, the heart’s primary
pacemaker.
A: AV node delays conduction, not initiates it.
B: Bundle of His conducts impulses to ventricles.
D: Purkinje fibers distribute impulses through ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a PR interval of 0.28 seconds with every P
wave followed by a QRS complex. Which physiological function
is reflected by the prolonged PR interval?
A. Ventricular depolarization
B. Atrial repolarization
C. Delay at the AV node
D. Rapid conduction through Purkinje fibers
, Correct Answer: C
Rationale:
The PR interval represents conduction from atria through the
AV node. A prolonged PR interval indicates delayed conduction
at the AV node.
A: Reflected by QRS complex.
B: Not visible on ECG.
D: Would shorten, not prolong conduction time.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG rhythm shows a regular rate of 80 bpm, normal P
waves, and narrow QRS complexes. Which cardiac structure is
primarily responsible for ventricular depolarization seen on this
ECG?
A. SA node
B. AV node
C. Bundle branches
D. Atria
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization,
conducted through the bundle branches and Purkinje system.
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 tracing shows a regular rhythm at 72 bpm with upright
P waves preceding each QRS complex and a consistent PR
interval of 0.16 seconds. Which structure initiates this electrical
impulse?
,A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
Rationale:
The ECG shows a normal sinus rhythm: regular rate, upright P
waves before each QRS, and normal PR interval. This indicates
impulse initiation from the SA node, the heart’s primary
pacemaker.
A: AV node delays conduction, not initiates it.
B: Bundle of His conducts impulses to ventricles.
D: Purkinje fibers distribute impulses through ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a PR interval of 0.28 seconds with every P
wave followed by a QRS complex. Which physiological function
is reflected by the prolonged PR interval?
A. Ventricular depolarization
B. Atrial repolarization
C. Delay at the AV node
D. Rapid conduction through Purkinje fibers
, Correct Answer: C
Rationale:
The PR interval represents conduction from atria through the
AV node. A prolonged PR interval indicates delayed conduction
at the AV node.
A: Reflected by QRS complex.
B: Not visible on ECG.
D: Would shorten, not prolong conduction time.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG rhythm shows a regular rate of 80 bpm, normal P
waves, and narrow QRS complexes. Which cardiac structure is
primarily responsible for ventricular depolarization seen on this
ECG?
A. SA node
B. AV node
C. Bundle branches
D. Atria
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization,
conducted through the bundle branches and Purkinje system.
