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 shows a normal sinus rhythm at 72 bpm with upright P
waves preceding each QRS complex. Which 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 impulse
initiation from the SA node, the heart’s primary pacemaker.
The AV node delays conduction but does not initiate it. The
Bundle of His and Purkinje fibers conduct impulses to the
ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm demonstrates a consistent PR interval of 0.16
seconds. This reflects conduction through which structure?
A. SA node to AV node
B. AV node delay
C. Ventricular depolarization
D. Purkinje system
Correct Answer: B
Rationale:
The PR interval represents the time from atrial depolarization
, through AV nodal delay to ventricular conduction. A normal PR
interval (0.12–0.20 sec) reflects appropriate delay in the AV
node, allowing ventricular filling.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal P waves followed by QRS
complexes. Which cardiac valve is open during ventricular
depolarization?
A. Mitral valve
B. Tricuspid valve
C. Aortic valve
D. Pulmonic valve
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction. During contraction, the aortic
and pulmonic valves open to allow blood ejection. AV valves
(mitral and tricuspid) close at this time.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
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 shows a normal sinus rhythm at 72 bpm with upright P
waves preceding each QRS complex. Which 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 impulse
initiation from the SA node, the heart’s primary pacemaker.
The AV node delays conduction but does not initiate it. The
Bundle of His and Purkinje fibers conduct impulses to the
ventricles.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG rhythm demonstrates a consistent PR interval of 0.16
seconds. This reflects conduction through which structure?
A. SA node to AV node
B. AV node delay
C. Ventricular depolarization
D. Purkinje system
Correct Answer: B
Rationale:
The PR interval represents the time from atrial depolarization
, through AV nodal delay to ventricular conduction. A normal PR
interval (0.12–0.20 sec) reflects appropriate delay in the AV
node, allowing ventricular filling.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal P waves followed by QRS
complexes. Which cardiac valve is open during ventricular
depolarization?
A. Mitral valve
B. Tricuspid valve
C. Aortic valve
D. Pulmonic valve
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction. During contraction, the aortic
and pulmonic valves open to allow blood ejection. AV valves
(mitral and tricuspid) close at this time.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
