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 strip shows a regular rhythm at 72 bpm, upright
P waves preceding each QRS complex, and a PR interval of 0.16
seconds. Which cardiac structure is primarily 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 normal sinus rhythm: regular rate (60–100
bpm), upright P waves before each QRS, and normal PR interval
(0.12–0.20 sec). This indicates impulse initiation from the SA
node, the heart’s natural pacemaker.
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are ventricular conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a regular rhythm with a rate of 88 bpm. Each P
wave is followed by a QRS complex. Which sequence correctly
represents normal electrical conduction through the heart?
A. AV node → SA node → ventricles
B. SA node → AV node → ventricles
C. Ventricles → SA node → AV node
D. Bundle branches → SA node → atria
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels through the
atria, pauses at the AV node, then continues to the ventricles
, via the conduction system. The ECG pattern of consistent P-QRS
relationship reflects this pathway.
• A, C, and D show incorrect conduction sequences.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates absent P waves and irregular
ventricular response. Which cardiac function is most directly
affected by loss of effective atrial contraction?
A. Ventricular depolarization
B. Cardiac output contribution from atrial kick
C. Coronary artery perfusion
D. Ventricular repolarization
Correct Answer: B
Rationale:
The absence of organized P waves indicates loss of atrial
contraction. The “atrial kick” contributes to ventricular filling
and cardiac output. Without it, cardiac output may decrease.
• A and D refer to ventricular electrical activity.
• C is influenced more by diastolic pressure than atrial
contraction.
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 strip shows a regular rhythm at 72 bpm, upright
P waves preceding each QRS complex, and a PR interval of 0.16
seconds. Which cardiac structure is primarily 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 normal sinus rhythm: regular rate (60–100
bpm), upright P waves before each QRS, and normal PR interval
(0.12–0.20 sec). This indicates impulse initiation from the SA
node, the heart’s natural pacemaker.
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are ventricular conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG shows a regular rhythm with a rate of 88 bpm. Each P
wave is followed by a QRS complex. Which sequence correctly
represents normal electrical conduction through the heart?
A. AV node → SA node → ventricles
B. SA node → AV node → ventricles
C. Ventricles → SA node → AV node
D. Bundle branches → SA node → atria
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels through the
atria, pauses at the AV node, then continues to the ventricles
, via the conduction system. The ECG pattern of consistent P-QRS
relationship reflects this pathway.
• A, C, and D show incorrect conduction sequences.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG demonstrates absent P waves and irregular
ventricular response. Which cardiac function is most directly
affected by loss of effective atrial contraction?
A. Ventricular depolarization
B. Cardiac output contribution from atrial kick
C. Coronary artery perfusion
D. Ventricular repolarization
Correct Answer: B
Rationale:
The absence of organized P waves indicates loss of atrial
contraction. The “atrial kick” contributes to ventricular filling
and cardiac output. Without it, cardiac output may decrease.
• A and D refer to ventricular electrical activity.
• C is influenced more by diastolic pressure than atrial
contraction.
