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 shows a regular rate of 72 bpm, upright P waves
preceding each QRS complex, and a consistent PR interval.
Which 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:
The ECG shows a normal sinus rhythm: regular rate (60–100
bpm), upright P waves before each QRS, and consistent PR
intervals. This indicates impulse initiation from the SA node, the
heart’s primary pacemaker.
• A: AV node delays conduction but does not initiate normal
sinus rhythm.
• C & D: These conduct impulses but are not primary
pacemakers under normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG tracing shows a normal sinus rhythm. Which ECG
component represents atrial depolarization related to blood
movement from atria to ventricles?
A. QRS complex
B. T wave
C. P wave
D. PR segment
Correct Answer: C
, Rationale:
The P wave represents atrial depolarization, which precedes
atrial contraction and blood flow into the ventricles.
• A: QRS = ventricular depolarization.
• B: T wave = ventricular repolarization.
• D: PR segment reflects conduction delay, not
depolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows a consistent PR interval of 0.16 seconds.
This interval reflects conduction through which structure
responsible for delaying impulses to allow ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction from atria through the AV
node. The AV node delays the impulse, allowing ventricles to fill
before contraction.
• A: SA node initiates impulse.
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 shows a regular rate of 72 bpm, upright P waves
preceding each QRS complex, and a consistent PR interval.
Which 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:
The ECG shows a normal sinus rhythm: regular rate (60–100
bpm), upright P waves before each QRS, and consistent PR
intervals. This indicates impulse initiation from the SA node, the
heart’s primary pacemaker.
• A: AV node delays conduction but does not initiate normal
sinus rhythm.
• C & D: These conduct impulses but are not primary
pacemakers under normal conditions.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 2
An ECG tracing shows a normal sinus rhythm. Which ECG
component represents atrial depolarization related to blood
movement from atria to ventricles?
A. QRS complex
B. T wave
C. P wave
D. PR segment
Correct Answer: C
, Rationale:
The P wave represents atrial depolarization, which precedes
atrial contraction and blood flow into the ventricles.
• A: QRS = ventricular depolarization.
• B: T wave = ventricular repolarization.
• D: PR segment reflects conduction delay, not
depolarization.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows a consistent PR interval of 0.16 seconds.
This interval reflects conduction through which structure
responsible for delaying impulses to allow ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The PR interval reflects conduction from atria through the AV
node. The AV node delays the impulse, allowing ventricles to fill
before contraction.
• A: SA node initiates impulse.
