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
Electrical impulses that normally initiate each heartbeat
originate in which cardiac structure located in the right atrium?
A. Atrioventricular node
B. Sinoatrial node
,C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The sinoatrial (SA) node is the heart’s normal pacemaker and
initiates the electrical impulse for each heartbeat. This impulse
spreads through the atria before reaching the AV node. The AV
node delays conduction but does not normally initiate the
heartbeat. The Bundle of His and Purkinje fibers conduct
impulses through the ventricles after AV nodal conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows normal upright P waves before
every QRS complex. Which structure is responsible for
generating the atrial depolarization represented by the P wave?
A. SA node impulse spreading through the atria
B. AV node impulse entering the ventricles
C. Purkinje fiber depolarization
D. Ventricular repolarization
Correct Answer: A
, Rationale:
The P wave represents atrial depolarization caused by impulse
initiation in the SA node and conduction through the atria. AV
node impulse delay occurs after atrial depolarization. Purkinje
fibers depolarize the ventricles, contributing to the QRS
complex. Ventricular repolarization produces the T wave.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A telemetry student is asked which structure normally delays
the electrical impulse before ventricular depolarization,
allowing time for ventricular filling. Which is correct?
A. SA node
B. AV node
C. Right bundle branch
D. Left ventricle
Correct Answer: B
Rationale:
The AV node delays conduction of the impulse before it enters
the ventricles, allowing time for atrial contraction and
ventricular filling. The SA node initiates the impulse but does
not create the primary delay. Bundle branches conduct rapidly
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
Electrical impulses that normally initiate each heartbeat
originate in which cardiac structure located in the right atrium?
A. Atrioventricular node
B. Sinoatrial node
,C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The sinoatrial (SA) node is the heart’s normal pacemaker and
initiates the electrical impulse for each heartbeat. This impulse
spreads through the atria before reaching the AV node. The AV
node delays conduction but does not normally initiate the
heartbeat. The Bundle of His and Purkinje fibers conduct
impulses through the ventricles after AV nodal conduction.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows normal upright P waves before
every QRS complex. Which structure is responsible for
generating the atrial depolarization represented by the P wave?
A. SA node impulse spreading through the atria
B. AV node impulse entering the ventricles
C. Purkinje fiber depolarization
D. Ventricular repolarization
Correct Answer: A
, Rationale:
The P wave represents atrial depolarization caused by impulse
initiation in the SA node and conduction through the atria. AV
node impulse delay occurs after atrial depolarization. Purkinje
fibers depolarize the ventricles, contributing to the QRS
complex. Ventricular repolarization produces the T wave.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A telemetry student is asked which structure normally delays
the electrical impulse before ventricular depolarization,
allowing time for ventricular filling. Which is correct?
A. SA node
B. AV node
C. Right bundle branch
D. Left ventricle
Correct Answer: B
Rationale:
The AV node delays conduction of the impulse before it enters
the ventricles, allowing time for atrial contraction and
ventricular filling. The SA node initiates the impulse but does
not create the primary delay. Bundle branches conduct rapidly
