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 normal sinus rhythm with upright P
waves in lead II, each followed by a QRS complex. Which
cardiac structure is responsible for initiating this electrical
impulse?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The upright P wave preceding each QRS indicates atrial
depolarization originating from the SA node, the heart’s natural
pacemaker. The AV node delays conduction but does not
initiate it. The Bundle of His and Purkinje fibers conduct
impulses to ventricles, not initiate them.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a PR interval of 0.16 seconds with consistent P
waves preceding each QRS. Which structure is responsible for
the delay represented by the PR interval?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction from atria through the AV
node. The AV node slows conduction to allow ventricular filling.
The SA node initiates impulses, while bundle branches and
Purkinje fibers conduct ventricular depolarization.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal P waves followed by
narrow QRS complexes. Which pathway conducts the impulse
immediately after the AV node?
A. Purkinje fibers
B. Bundle of His
C. SA node
D. Coronary arteries
Correct Answer: B
Rationale:
After the AV node, impulses travel through the Bundle of His
before dividing into bundle branches. Purkinje fibers conduct
later. SA node is the origin, and coronary arteries supply blood,
not electrical conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows synchronized atrial and ventricular activity.
Which structure ensures coordinated ventricular contraction by
rapidly distributing impulses?
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 normal sinus rhythm with upright P
waves in lead II, each followed by a QRS complex. Which
cardiac structure is responsible for initiating this electrical
impulse?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The upright P wave preceding each QRS indicates atrial
depolarization originating from the SA node, the heart’s natural
pacemaker. The AV node delays conduction but does not
initiate it. The Bundle of His and Purkinje fibers conduct
impulses to ventricles, not initiate them.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a PR interval of 0.16 seconds with consistent P
waves preceding each QRS. Which structure is responsible for
the delay represented by the PR interval?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction from atria through the AV
node. The AV node slows conduction to allow ventricular filling.
The SA node initiates impulses, while bundle branches and
Purkinje fibers conduct ventricular depolarization.
, Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal P waves followed by
narrow QRS complexes. Which pathway conducts the impulse
immediately after the AV node?
A. Purkinje fibers
B. Bundle of His
C. SA node
D. Coronary arteries
Correct Answer: B
Rationale:
After the AV node, impulses travel through the Bundle of His
before dividing into bundle branches. Purkinje fibers conduct
later. SA node is the origin, and coronary arteries supply blood,
not electrical conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows synchronized atrial and ventricular activity.
Which structure ensures coordinated ventricular contraction by
rapidly distributing impulses?
