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
A patient’s ECG shows a regular rhythm at 72 bpm, upright P
waves preceding each QRS complex, a constant PR interval, and
narrow QRS complexes. Which cardiac structure is responsible
for initiating this normal rhythm?
A. Atrioventricular junction
B. Sinoatrial node
C. Bundle branches
D. Purkinje fibers
,Correct Answer: B
Rationale:
The ECG demonstrates normal sinus rhythm: regular rate,
upright P waves, one P before each QRS, and consistent
conduction. This pattern originates in the sinoatrial (SA) node,
the heart’s primary pacemaker. The AV junction delays
conduction, while bundle branches and Purkinje fibers conduct
impulses through the ventricles rather than initiate normal
rhythm.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows regular P waves, but no QRS
complexes follow. Which structure normally conducts impulses
from the atria to the ventricles and is most likely involved?
A. SA node
B. AV node
C. Mitral valve
D. Coronary sinus
Correct Answer: B
Rationale:
P waves indicate atrial depolarization is occurring, but absent
QRS complexes indicate impulses are not reaching the
, ventricles. The AV node is the normal electrical bridge between
atria and ventricles. The mitral valve is mechanical, not
electrical, and the coronary sinus drains venous blood.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal atrial depolarization
followed by ventricular depolarization. Which heart valve opens
immediately before ventricular ejection begins?
A. Tricuspid valve
B. Pulmonic valve
C. Mitral valve
D. Aortic valve
Correct Answer: D
Rationale:
After ventricular depolarization (QRS), ventricular contraction
begins. Once left ventricular pressure exceeds aortic pressure,
the aortic valve opens, allowing blood ejection into systemic
circulation. AV valves close before semilunar valves open.
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
A patient’s ECG shows a regular rhythm at 72 bpm, upright P
waves preceding each QRS complex, a constant PR interval, and
narrow QRS complexes. Which cardiac structure is responsible
for initiating this normal rhythm?
A. Atrioventricular junction
B. Sinoatrial node
C. Bundle branches
D. Purkinje fibers
,Correct Answer: B
Rationale:
The ECG demonstrates normal sinus rhythm: regular rate,
upright P waves, one P before each QRS, and consistent
conduction. This pattern originates in the sinoatrial (SA) node,
the heart’s primary pacemaker. The AV junction delays
conduction, while bundle branches and Purkinje fibers conduct
impulses through the ventricles rather than initiate normal
rhythm.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip shows regular P waves, but no QRS
complexes follow. Which structure normally conducts impulses
from the atria to the ventricles and is most likely involved?
A. SA node
B. AV node
C. Mitral valve
D. Coronary sinus
Correct Answer: B
Rationale:
P waves indicate atrial depolarization is occurring, but absent
QRS complexes indicate impulses are not reaching the
, ventricles. The AV node is the normal electrical bridge between
atria and ventricles. The mitral valve is mechanical, not
electrical, and the coronary sinus drains venous blood.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates normal atrial depolarization
followed by ventricular depolarization. Which heart valve opens
immediately before ventricular ejection begins?
A. Tricuspid valve
B. Pulmonic valve
C. Mitral valve
D. Aortic valve
Correct Answer: D
Rationale:
After ventricular depolarization (QRS), ventricular contraction
begins. Once left ventricular pressure exceeds aortic pressure,
the aortic valve opens, allowing blood ejection into systemic
circulation. AV valves close before semilunar valves open.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
