ECG Workout
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
A telemetry nurse reviews a patient’s ECG and notes that atrial
depolarization is represented before each QRS complex. Which
ECG waveform represents atrial depolarization?
A. T wave
B. QRS complex
C. P wave
D. ST segment
Correct Answer: C
Rationale:
The P wave represents atrial depolarization as the electrical
impulse spreads through the atria. This waveform normally
appears before the QRS complex in a normal sinus rhythm. The
QRS complex represents ventricular depolarization, while the T
wave reflects ventricular repolarization. The ST segment is the
period between ventricular depolarization and repolarization.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
,An ECG rhythm strip demonstrates a normal P wave followed
by a QRS complex and T wave. Which cardiac structure
normally initiates the impulse responsible for this rhythm?
A. Atrioventricular junction
B. Bundle branches
C. Sinoatrial node
D. Purkinje fibers
Correct Answer: C
Rationale:
The sinoatrial (SA) node is the heart’s normal pacemaker and
initiates the electrical impulse that produces normal sinus
rhythm. The impulse spreads through the atria, producing the P
wave. The AV junction delays conduction before ventricular
depolarization occurs.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A student analyzing an ECG strip asks why ventricular
contraction follows atrial contraction during normal sinus
rhythm. Which structure is primarily responsible for delaying
the impulse before ventricular depolarization?
, A. Bundle of His
B. Purkinje fibers
C. Sinoatrial node
D. Atrioventricular node
Correct Answer: D
Rationale:
The atrioventricular (AV) node delays the electrical impulse
before it travels to the ventricles. This delay allows the
ventricles adequate time to fill before ventricular contraction
occurs. The Bundle of His and Purkinje fibers rapidly conduct
the impulse through the ventricles after the AV node.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
A patient’s ECG shows a normal sequence of atrial
depolarization followed by ventricular depolarization. Which
ECG component corresponds to ventricular depolarization?
A. PR interval
B. P wave
C. QRS complex
D. T wave
Correct Answer: C
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
A telemetry nurse reviews a patient’s ECG and notes that atrial
depolarization is represented before each QRS complex. Which
ECG waveform represents atrial depolarization?
A. T wave
B. QRS complex
C. P wave
D. ST segment
Correct Answer: C
Rationale:
The P wave represents atrial depolarization as the electrical
impulse spreads through the atria. This waveform normally
appears before the QRS complex in a normal sinus rhythm. The
QRS complex represents ventricular depolarization, while the T
wave reflects ventricular repolarization. The ST segment is the
period between ventricular depolarization and repolarization.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
,An ECG rhythm strip demonstrates a normal P wave followed
by a QRS complex and T wave. Which cardiac structure
normally initiates the impulse responsible for this rhythm?
A. Atrioventricular junction
B. Bundle branches
C. Sinoatrial node
D. Purkinje fibers
Correct Answer: C
Rationale:
The sinoatrial (SA) node is the heart’s normal pacemaker and
initiates the electrical impulse that produces normal sinus
rhythm. The impulse spreads through the atria, producing the P
wave. The AV junction delays conduction before ventricular
depolarization occurs.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A student analyzing an ECG strip asks why ventricular
contraction follows atrial contraction during normal sinus
rhythm. Which structure is primarily responsible for delaying
the impulse before ventricular depolarization?
, A. Bundle of His
B. Purkinje fibers
C. Sinoatrial node
D. Atrioventricular node
Correct Answer: D
Rationale:
The atrioventricular (AV) node delays the electrical impulse
before it travels to the ventricles. This delay allows the
ventricles adequate time to fill before ventricular contraction
occurs. The Bundle of His and Purkinje fibers rapidly conduct
the impulse through the ventricles after the AV node.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
A patient’s ECG shows a normal sequence of atrial
depolarization followed by ventricular depolarization. Which
ECG component corresponds to ventricular depolarization?
A. PR interval
B. P wave
C. QRS complex
D. T wave
Correct Answer: C
