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 tracing shows a regular rhythm at 72 bpm with upright
P waves preceding each QRS complex. The P waves originate
from the sinoatrial (SA) node. Which anatomical structure is
responsible for initiating this electrical impulse?
A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
,Rationale:
The SA node, located in the right atrium, is the primary
pacemaker of the heart and initiates impulses that produce
normal sinus rhythm, reflected as upright P waves before each
QRS. The AV node delays conduction, while 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 shows a normal sinus rhythm. The electrical impulse
travels from the atria to the ventricles, reflected by the PR
interval. Which structure is responsible for delaying the impulse
to allow ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse, allowing time for the
atria to contract and fill the ventricles. This delay is represented
by the PR interval on the ECG. The SA node initiates the
impulse, while bundle branches and Purkinje fibers conduct it
further.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows a regular rhythm with normal P waves
and QRS complexes. Which sequence best describes normal
blood flow corresponding to this electrical activity?
A. Left atrium → right atrium → ventricles
B. Right atrium → right ventricle → lungs → left atrium → left
ventricle
C. Left ventricle → lungs → right atrium
D. Right ventricle → left ventricle → lungs
Correct Answer: B
Rationale:
Normal electrical activity corresponds with mechanical flow:
blood moves from the right atrium to right ventricle, then to
the lungs, back to the left atrium, and into the left ventricle.
This coordinated flow is triggered by proper conduction seen
on ECG.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows consistent P waves followed by QRS complexes.
Which heart valve opens during ventricular systole,
corresponding with the QRS complex?
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 tracing shows a regular rhythm at 72 bpm with upright
P waves preceding each QRS complex. The P waves originate
from the sinoatrial (SA) node. Which anatomical structure is
responsible for initiating this electrical impulse?
A. Atrioventricular (AV) node
B. Bundle of His
C. Sinoatrial (SA) node
D. Purkinje fibers
Correct Answer: C
,Rationale:
The SA node, located in the right atrium, is the primary
pacemaker of the heart and initiates impulses that produce
normal sinus rhythm, reflected as upright P waves before each
QRS. The AV node delays conduction, while 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 shows a normal sinus rhythm. The electrical impulse
travels from the atria to the ventricles, reflected by the PR
interval. Which structure is responsible for delaying the impulse
to allow ventricular filling?
A. SA node
B. AV node
C. Bundle branches
D. Purkinje fibers
Correct Answer: B
Rationale:
The AV node delays the electrical impulse, allowing time for the
atria to contract and fill the ventricles. This delay is represented
by the PR interval on the ECG. The SA node initiates the
impulse, while bundle branches and Purkinje fibers conduct it
further.
, Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows a regular rhythm with normal P waves
and QRS complexes. Which sequence best describes normal
blood flow corresponding to this electrical activity?
A. Left atrium → right atrium → ventricles
B. Right atrium → right ventricle → lungs → left atrium → left
ventricle
C. Left ventricle → lungs → right atrium
D. Right ventricle → left ventricle → lungs
Correct Answer: B
Rationale:
Normal electrical activity corresponds with mechanical flow:
blood moves from the right atrium to right ventricle, then to
the lungs, back to the left atrium, and into the left ventricle.
This coordinated flow is triggered by proper conduction seen
on ECG.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG shows consistent P waves followed by QRS complexes.
Which heart valve opens during ventricular systole,
corresponding with the QRS complex?
