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. Posttest
Question 1
A patient’s ECG shows a regular rhythm at 72 bpm with upright
P waves before each QRS complex and normal intervals. Which
cardiac structure is primarily responsible for initiating this
electrical activity?
A. Atrioventricular node
B. Sinoatrial node
C. Bundle of His
D. Purkinje fibers
,Correct Answer: B
Rationale:
The ECG shows a normal sinus rhythm (regular rhythm, upright
P waves, normal rate), indicating initiation from the sinoatrial
(SA) node. The SA node is the natural pacemaker of the heart
and is located in the right atrium.
• A is incorrect: AV node delays conduction but does not
initiate normal rhythm.
• C and D are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm strip demonstrates consistent P waves
preceding each QRS complex. Which heart chamber is
responsible for producing the electrical activity represented by
the P wave?
A. Left ventricle
B. Right ventricle
C. Atria
D. Septum
Correct Answer: C
, Rationale:
The P wave represents atrial depolarization, meaning the atria
are electrically activated.
• A and B are incorrect: ventricles are represented by the
QRS complex.
• D is incorrect: septal activity is part of early ventricular
depolarization.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows a normal PR interval. Which cardiac
structure is responsible for delaying the electrical impulse
reflected in this interval?
A. SA node
B. AV node
C. Bundle branches
D. Ventricular myocardium
Correct Answer: B
Rationale:
The PR interval reflects conduction from the atria through the
AV node. The AV node delays the impulse to allow ventricular
filling.