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 regular rhythm at 72 bpm with upright P waves
before each QRS complex, consistent PR intervals, and narrow
QRS complexes. Which 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 is the primary pacemaker of the heart and initiates
the electrical impulse, producing the P wave seen before each
QRS complex. A normal sinus rhythm reflects this origin.
• A: AV node delays conduction but does not initiate normal
rhythm
• B: Bundle of His conducts impulses to ventricles
• D: Purkinje fibers distribute impulses in ventricles
Source:
*ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a regular rhythm at 60 bpm. Each P wave
is followed by a QRS complex, and the PR interval is prolonged
but consistent. 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 slows conduction, reflected as the PR interval on
ECG, allowing time for ventricular filling.
, • A: SA node initiates impulse
• C: Bundle branches conduct rapidly
• D: Purkinje fibers spread impulse through ventricles
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG shows a normal sinus rhythm at 80 bpm. Which heart
valve opens immediately after ventricular depolarization (QRS
complex) to allow blood flow into the systemic circulation?
A. Tricuspid valve
B. Pulmonic valve
C. Mitral valve
D. Aortic valve
Correct Answer: D
Rationale:
The QRS complex represents ventricular depolarization leading
to contraction. The aortic valve opens to allow blood flow into
the aorta.
• A & C: AV valves close during ventricular contraction
• B: Pulmonic valve directs blood to lungs, not systemic
circulation
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 regular rhythm at 72 bpm with upright P waves
before each QRS complex, consistent PR intervals, and narrow
QRS complexes. Which 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 is the primary pacemaker of the heart and initiates
the electrical impulse, producing the P wave seen before each
QRS complex. A normal sinus rhythm reflects this origin.
• A: AV node delays conduction but does not initiate normal
rhythm
• B: Bundle of His conducts impulses to ventricles
• D: Purkinje fibers distribute impulses in ventricles
Source:
*ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG demonstrates a regular rhythm at 60 bpm. Each P wave
is followed by a QRS complex, and the PR interval is prolonged
but consistent. 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 slows conduction, reflected as the PR interval on
ECG, allowing time for ventricular filling.
, • A: SA node initiates impulse
• C: Bundle branches conduct rapidly
• D: Purkinje fibers spread impulse through ventricles
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
An ECG shows a normal sinus rhythm at 80 bpm. Which heart
valve opens immediately after ventricular depolarization (QRS
complex) to allow blood flow into the systemic circulation?
A. Tricuspid valve
B. Pulmonic valve
C. Mitral valve
D. Aortic valve
Correct Answer: D
Rationale:
The QRS complex represents ventricular depolarization leading
to contraction. The aortic valve opens to allow blood flow into
the aorta.
• A & C: AV valves close during ventricular contraction
• B: Pulmonic valve directs blood to lungs, not systemic
circulation
