ECG Workout
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
An ECG rhythm strip is being interpreted in a patient with
normal atrial contraction. Which anatomical structure is
responsible for initiating the electrical impulse that leads to the
P wave on the ECG?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The SA node is the primary pacemaker located in the right
atrium and initiates atrial depolarization, which produces the P
wave on the ECG. The AV node delays conduction, while the
Bundle of His and Purkinje fibers distribute impulses to the
ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
A patient’s ECG shows normal sinus rhythm. Which structure
,ensures coordinated conduction from atria to ventricles after
the AV node delay?
A. SA node
B. AV node
C. Bundle of His
D. Coronary sinus
Correct Answer: C
Rationale:
The Bundle of His conducts impulses from the AV node into the
interventricular septum, ensuring synchronized ventricular
depolarization (QRS complex formation). The SA node initiates
the impulse, while the AV node delays it.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
During ECG interpretation, a clinician notes that ventricular
contraction follows atrial contraction in a coordinated manner.
Which heart valve function is MOST directly dependent on this
electrical sequence?
A. Mitral valve closure before tricuspid valve
B. Aortic valve opening before ventricular systole
C. AV valve closure before ventricular systole
D. Pulmonic valve closure before atrial contraction
, Correct Answer: C
Rationale:
Electrical depolarization triggers ventricular contraction, which
causes AV valves (mitral and tricuspid) to close to prevent
backflow into atria. This mechanical response follows
ventricular systole initiated by the QRS complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows normal conduction. Which phase of the cardiac
cycle corresponds MOST directly with ventricular
depolarization?
A. P wave
B. PR segment
C. QRS complex
D. T wave
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction and ejection of blood through
the semilunar valves.
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
An ECG rhythm strip is being interpreted in a patient with
normal atrial contraction. Which anatomical structure is
responsible for initiating the electrical impulse that leads to the
P wave on the ECG?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
Rationale:
The SA node is the primary pacemaker located in the right
atrium and initiates atrial depolarization, which produces the P
wave on the ECG. The AV node delays conduction, while the
Bundle of His and Purkinje fibers distribute impulses to the
ventricles.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
A patient’s ECG shows normal sinus rhythm. Which structure
,ensures coordinated conduction from atria to ventricles after
the AV node delay?
A. SA node
B. AV node
C. Bundle of His
D. Coronary sinus
Correct Answer: C
Rationale:
The Bundle of His conducts impulses from the AV node into the
interventricular septum, ensuring synchronized ventricular
depolarization (QRS complex formation). The SA node initiates
the impulse, while the AV node delays it.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
During ECG interpretation, a clinician notes that ventricular
contraction follows atrial contraction in a coordinated manner.
Which heart valve function is MOST directly dependent on this
electrical sequence?
A. Mitral valve closure before tricuspid valve
B. Aortic valve opening before ventricular systole
C. AV valve closure before ventricular systole
D. Pulmonic valve closure before atrial contraction
, Correct Answer: C
Rationale:
Electrical depolarization triggers ventricular contraction, which
causes AV valves (mitral and tricuspid) to close to prevent
backflow into atria. This mechanical response follows
ventricular systole initiated by the QRS complex.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 4
An ECG shows normal conduction. Which phase of the cardiac
cycle corresponds MOST directly with ventricular
depolarization?
A. P wave
B. PR segment
C. QRS complex
D. T wave
Correct Answer: C
Rationale:
The QRS complex represents ventricular depolarization, which
leads to ventricular contraction and ejection of blood through
the semilunar valves.
