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 with upright
P waves before every QRS complex and a normal PR interval.
Which cardiac structure is responsible for initiating 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 (regular rate 60–100 bpm, upright P
waves preceding each QRS) indicates impulse initiation from
the SA node, the heart’s primary pacemaker. The AV node
delays conduction but does not normally initiate rhythm. The
Bundle of His and Purkinje fibers conduct impulses but are not
primary pacemakers.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG shows normal sinus rhythm. The nurse understands
that blood flow immediately following atrial depolarization (P
wave) moves through which valves?
A. Aortic and pulmonic valves
B. Mitral and tricuspid valves
C. Pulmonic and tricuspid valves
D. Aortic and mitral valves
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, causing atrial
contraction. This pushes blood from the atria into the ventricles
through the atrioventricular valves (mitral and tricuspid).
Semilunar valves (aortic and pulmonic) open later during
ventricular contraction.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG demonstrates a normal QRS complex following
each P wave. Which physiological event corresponds with the
QRS complex?
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial contraction
Correct Answer: B
Rationale:
The QRS complex represents ventricular depolarization, which
triggers ventricular contraction. Atrial repolarization occurs
simultaneously but is not visible. The T wave represents
ventricular repolarization, and atrial contraction corresponds to
the P wave.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows a consistent PR interval of 0.16 seconds. This
interval reflects conduction through which part of the heart?
A. Ventricular myocardium only
B. SA node to AV node
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 with upright
P waves before every QRS complex and a normal PR interval.
Which cardiac structure is responsible for initiating 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 (regular rate 60–100 bpm, upright P
waves preceding each QRS) indicates impulse initiation from
the SA node, the heart’s primary pacemaker. The AV node
delays conduction but does not normally initiate rhythm. The
Bundle of His and Purkinje fibers conduct impulses but are not
primary pacemakers.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG shows normal sinus rhythm. The nurse understands
that blood flow immediately following atrial depolarization (P
wave) moves through which valves?
A. Aortic and pulmonic valves
B. Mitral and tricuspid valves
C. Pulmonic and tricuspid valves
D. Aortic and mitral valves
Correct Answer: B
Rationale:
The P wave represents atrial depolarization, causing atrial
contraction. This pushes blood from the atria into the ventricles
through the atrioventricular valves (mitral and tricuspid).
Semilunar valves (aortic and pulmonic) open later during
ventricular contraction.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG demonstrates a normal QRS complex following
each P wave. Which physiological event corresponds with the
QRS complex?
A. Atrial repolarization
B. Ventricular depolarization
C. Ventricular repolarization
D. Atrial contraction
Correct Answer: B
Rationale:
The QRS complex represents ventricular depolarization, which
triggers ventricular contraction. Atrial repolarization occurs
simultaneously but is not visible. The T wave represents
ventricular repolarization, and atrial contraction corresponds to
the P wave.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows a consistent PR interval of 0.16 seconds. This
interval reflects conduction through which part of the heart?
A. Ventricular myocardium only
B. SA node to AV node
