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 normal sinus rhythm with upright P
waves preceding each QRS complex. Which cardiac structure is
primarily 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 upright P wave before each QRS indicates atrial
depolarization initiated by the SA node, the heart’s primary
pacemaker. 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 demonstrates normal atrial and ventricular
depolarization. Which heart valve closes at the onset of
ventricular depolarization (QRS complex)?
A. Mitral and tricuspid valves
B. Aortic and pulmonic valves
C. Pulmonic valve only
D. Aortic valve only
Correct Answer: A
, Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction. This causes closure of the AV
valves (mitral and tricuspid) to prevent backflow into the atria.
Semilunar valves open after pressure builds.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a normal PR interval. This interval
reflects conduction through which structure that delays the
impulse?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval represents conduction from atria through the
AV node. The AV node slows conduction to allow ventricular
filling before contraction. The SA node initiates impulses, not
delays them.
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 normal sinus rhythm with upright P
waves preceding each QRS complex. Which cardiac structure is
primarily 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 upright P wave before each QRS indicates atrial
depolarization initiated by the SA node, the heart’s primary
pacemaker. 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 demonstrates normal atrial and ventricular
depolarization. Which heart valve closes at the onset of
ventricular depolarization (QRS complex)?
A. Mitral and tricuspid valves
B. Aortic and pulmonic valves
C. Pulmonic valve only
D. Aortic valve only
Correct Answer: A
, Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction. This causes closure of the AV
valves (mitral and tricuspid) to prevent backflow into the atria.
Semilunar valves open after pressure builds.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a normal PR interval. This interval
reflects conduction through which structure that delays the
impulse?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval represents conduction from atria through the
AV node. The AV node slows conduction to allow ventricular
filling before contraction. The SA node initiates impulses, not
delays them.
