ECG Workout
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
A patient’s ECG shows a regular rhythm at 72 bpm with upright
P waves preceding every QRS complex and a normal PR
interval. Which cardiac structure is primarily responsible for
ensuring one-way blood flow during ventricular contraction?
A. Pulmonary veins
B. Atrioventricular valves
C. Coronary arteries
D. Superior vena cava
Correct Answer: B
Rationale:
A normal ECG reflects coordinated atrial and ventricular
contraction. During ventricular systole, the atrioventricular
valves prevent backflow into the atria, ensuring one-way blood
movement. Pulmonary veins return oxygenated blood,
coronary arteries supply myocardium, and the vena cava
returns systemic venous blood.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
,Question 2
An ECG rhythm demonstrates regular sinus activity at 80 bpm.
Blood ejected after ventricular depolarization first enters which
vessel from the right ventricle?
A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Left atrium
Correct Answer: B
Rationale:
Following ventricular contraction signaled after ventricular
depolarization, blood leaves the right ventricle through the
pulmonary artery toward the lungs. The aorta exits the left
ventricle, pulmonary veins return blood to the left atrium.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm with coordinated
atrial and ventricular activity. Which structure prevents blood
from flowing backward from the left ventricle into the left
atrium during ventricular contraction?
A. Pulmonic valve
B. Tricuspid valve
C. Mitral valve
D. Aortic valve
, Correct Answer: C
Rationale:
The mitral valve separates the left atrium and left ventricle and
prevents regurgitation during ventricular contraction. The
tricuspid valve is on the right side; pulmonic and aortic valves
are semilunar valves.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG strip demonstrates a normal P-QRS-T sequence. During
the period immediately after ventricular depolarization,
oxygenated blood is pumped into which structure?
A. Pulmonary artery
B. Right atrium
C. Aorta
D. Coronary sinus
Correct Answer: C
Rationale:
After ventricular contraction, the left ventricle pumps
oxygenated blood into the aorta for systemic circulation.
Pulmonary artery receives deoxygenated blood from the right
ventricle.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,Question 1
A patient’s ECG shows a regular rhythm at 72 bpm with upright
P waves preceding every QRS complex and a normal PR
interval. Which cardiac structure is primarily responsible for
ensuring one-way blood flow during ventricular contraction?
A. Pulmonary veins
B. Atrioventricular valves
C. Coronary arteries
D. Superior vena cava
Correct Answer: B
Rationale:
A normal ECG reflects coordinated atrial and ventricular
contraction. During ventricular systole, the atrioventricular
valves prevent backflow into the atria, ensuring one-way blood
movement. Pulmonary veins return oxygenated blood,
coronary arteries supply myocardium, and the vena cava
returns systemic venous blood.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
,Question 2
An ECG rhythm demonstrates regular sinus activity at 80 bpm.
Blood ejected after ventricular depolarization first enters which
vessel from the right ventricle?
A. Aorta
B. Pulmonary artery
C. Pulmonary vein
D. Left atrium
Correct Answer: B
Rationale:
Following ventricular contraction signaled after ventricular
depolarization, blood leaves the right ventricle through the
pulmonary artery toward the lungs. The aorta exits the left
ventricle, pulmonary veins return blood to the left atrium.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm with coordinated
atrial and ventricular activity. Which structure prevents blood
from flowing backward from the left ventricle into the left
atrium during ventricular contraction?
A. Pulmonic valve
B. Tricuspid valve
C. Mitral valve
D. Aortic valve
, Correct Answer: C
Rationale:
The mitral valve separates the left atrium and left ventricle and
prevents regurgitation during ventricular contraction. The
tricuspid valve is on the right side; pulmonic and aortic valves
are semilunar valves.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
Question 4
An ECG strip demonstrates a normal P-QRS-T sequence. During
the period immediately after ventricular depolarization,
oxygenated blood is pumped into which structure?
A. Pulmonary artery
B. Right atrium
C. Aorta
D. Coronary sinus
Correct Answer: C
Rationale:
After ventricular contraction, the left ventricle pumps
oxygenated blood into the aorta for systemic circulation.
Pulmonary artery receives deoxygenated blood from the right
ventricle.
Source: ECG Workout: Exercises in Arrhythmia Interpretation,
8th Edition – Chapter 1
