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. Each QRS
complex is preceded by a uniform upright P wave, the PR
interval measures 0.16 seconds, and the QRS duration is 0.08
seconds. Which cardiac structure initiates this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The rhythm is regular with normal rate (60–100 bpm), upright P
waves before each QRS, normal PR interval (0.12–0.20 sec), and
narrow QRS (<0.12 sec), indicating normal sinus rhythm. This
rhythm originates from the SA node, the heart’s primary
pacemaker.
• A is incorrect: AV node would produce absent or inverted
P waves.
• C and D are incorrect: these produce wider QRS and
slower rates.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm shows a regular rate of 88 bpm with consistent
P waves preceding each QRS. The nurse understands that
depolarization spreads from the SA node through which
structure to produce the P wave?
A. Ventricles
B. Atria
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which occurs as
, the electrical impulse travels from the SA node through the
atria.
• A is incorrect: ventricles depolarize during the QRS
complex.
• C and D occur after AV node conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a PR interval of 0.18 seconds. This
interval represents conduction between which two structures?
A. SA node to atria
B. Atria to AV node and His-Purkinje system
C. AV node to ventricles only
D. Ventricles to atria
Correct Answer: B
Rationale:
The PR interval reflects the time from atrial depolarization
through the AV node and into the His-Purkinje system before
ventricular depolarization.
• A is incomplete (only atrial depolarization).
• C excludes atrial contribution.
• D is incorrect physiologically.
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. Each QRS
complex is preceded by a uniform upright P wave, the PR
interval measures 0.16 seconds, and the QRS duration is 0.08
seconds. Which cardiac structure initiates this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The rhythm is regular with normal rate (60–100 bpm), upright P
waves before each QRS, normal PR interval (0.12–0.20 sec), and
narrow QRS (<0.12 sec), indicating normal sinus rhythm. This
rhythm originates from the SA node, the heart’s primary
pacemaker.
• A is incorrect: AV node would produce absent or inverted
P waves.
• C and D are incorrect: these produce wider QRS and
slower rates.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm shows a regular rate of 88 bpm with consistent
P waves preceding each QRS. The nurse understands that
depolarization spreads from the SA node through which
structure to produce the P wave?
A. Ventricles
B. Atria
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, which occurs as
, the electrical impulse travels from the SA node through the
atria.
• A is incorrect: ventricles depolarize during the QRS
complex.
• C and D occur after AV node conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a PR interval of 0.18 seconds. This
interval represents conduction between which two structures?
A. SA node to atria
B. Atria to AV node and His-Purkinje system
C. AV node to ventricles only
D. Ventricles to atria
Correct Answer: B
Rationale:
The PR interval reflects the time from atrial depolarization
through the AV node and into the His-Purkinje system before
ventricular depolarization.
• A is incomplete (only atrial depolarization).
• C excludes atrial contribution.
• D is incorrect physiologically.
