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 rhythm strip shows a regular rhythm at 72 bpm, upright
P waves before each QRS, PR interval 0.16 seconds, and narrow
QRS complexes. Which structure initiates 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 in the SA node, which is the
,heart’s natural pacemaker. The presence of upright P waves
preceding each QRS with a consistent PR interval indicates
atrial depolarization initiated by the SA node.
A is incorrect: AV node delays conduction but does not initiate
normal sinus rhythm.
C and D are ventricular conduction pathways, not primary
pacemakers in normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG shows a regular rhythm at 88 bpm with consistent P-
QRS-T cycles. Which sequence correctly represents electrical
conduction corresponding to normal blood flow direction?
A. AV node → SA node → ventricles
B. SA node → atria → AV node → ventricles
C. Ventricles → atria → SA node
D. Purkinje fibers → SA node → AV node
Correct Answer: B
Rationale:
Electrical conduction begins at the SA node, spreads through
the atria (P wave), pauses at the AV node, and then travels to
the ventricles (QRS). This sequence coordinates mechanical
contraction and proper blood flow through the heart and lungs.
A, C, and D describe incorrect conduction pathways.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
An ECG strip shows normal sinus rhythm. Which ECG
component represents atrial contraction that contributes to
ventricular filling?
A. QRS complex
B. T wave
C. P wave
D. ST segment
Correct Answer: C
Rationale:
The P wave represents atrial depolarization, which leads to
atrial contraction and assists ventricular filling.
A represents ventricular depolarization.
B represents ventricular repolarization.
D is the period between depolarization and repolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows a regular rhythm at 70 bpm with normal
intervals. Which mechanical event follows the QRS complex?
A. Atrial contraction
B. Ventricular contraction
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 rhythm strip shows a regular rhythm at 72 bpm, upright
P waves before each QRS, PR interval 0.16 seconds, and narrow
QRS complexes. Which structure initiates 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 in the SA node, which is the
,heart’s natural pacemaker. The presence of upright P waves
preceding each QRS with a consistent PR interval indicates
atrial depolarization initiated by the SA node.
A is incorrect: AV node delays conduction but does not initiate
normal sinus rhythm.
C and D are ventricular conduction pathways, not primary
pacemakers in normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG shows a regular rhythm at 88 bpm with consistent P-
QRS-T cycles. Which sequence correctly represents electrical
conduction corresponding to normal blood flow direction?
A. AV node → SA node → ventricles
B. SA node → atria → AV node → ventricles
C. Ventricles → atria → SA node
D. Purkinje fibers → SA node → AV node
Correct Answer: B
Rationale:
Electrical conduction begins at the SA node, spreads through
the atria (P wave), pauses at the AV node, and then travels to
the ventricles (QRS). This sequence coordinates mechanical
contraction and proper blood flow through the heart and lungs.
A, C, and D describe incorrect conduction pathways.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
An ECG strip shows normal sinus rhythm. Which ECG
component represents atrial contraction that contributes to
ventricular filling?
A. QRS complex
B. T wave
C. P wave
D. ST segment
Correct Answer: C
Rationale:
The P wave represents atrial depolarization, which leads to
atrial contraction and assists ventricular filling.
A represents ventricular depolarization.
B represents ventricular repolarization.
D is the period between depolarization and repolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows a regular rhythm at 70 bpm with normal
intervals. Which mechanical event follows the QRS complex?
A. Atrial contraction
B. Ventricular contraction
