Solution Manual For
Electrocardiography for Healthcare
Professionals 6th Edition By Kathryn A.
Booth, Thomas Edward O'Brien Chapter
1-15
Electrocardiography Practice Questions
Chapter 1–3: ECG Basics & Heart Anatomy
1. What is the normal rate of the SA node?
A) 20–40 bpm
B) 60–100 bpm
C) 100–120 bpm
D) 40–60 bpm
Answer: B – SA node normally fires at 60–100 beats per minute.
2. The P wave represents:
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer: B – P wave corresponds to atrial depolarization.
3. The QRS complex represents:
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) SA node firing
Answer: A – QRS = ventricular depolarization.
4. Which wave represents ventricular repolarization?
A) P wave
B) QRS complex
C) T wave
D) U wave
Answer: C – T wave = ventricular repolarization.
,5. Which interval represents the time from atrial depolarization to ventricular
depolarization?
A) QT interval
B) PR interval
C) ST segment
D) RR interval
Answer: B – PR interval reflects conduction from atria to ventricles.
6. A prolonged PR interval (>0.20 sec) indicates:
A) Normal conduction
B) First-degree AV block
C) Second-degree AV block
D) Bundle branch block
Answer: B – First-degree AV block delays AV node conduction.
7. Normal QRS duration is:
A) 0.04–0.10 sec
B) 0.10–0.12 sec
C) 0.12–0.20 sec
D) 0.20–0.25 sec
Answer: A – Normal QRS = 0.04–0.10 seconds.
8. The QT interval represents:
A) Atrial depolarization
B) Ventricular depolarization and repolarization
C) AV conduction
D) Ventricular relaxation only
Answer: B – QT includes ventricular depolarization + repolarization.
9. What is the normal axis of the heart on ECG?
A) 0–90°
B) –30° to +90°
C) 90–180°
D) –90° to 0°
Answer: B – Normal QRS axis: –30° to +90°.
10.The U wave may indicate:
A) Hypokalemia
B) Hyperkalemia
C) Myocardial infarction
D) Atrial fibrillation
Answer: A – Prominent U waves suggest low potassium.
11.Which lead is considered the “reference” for rhythm analysis?
A) Lead I
B) Lead II
C) Lead III
D) V1
Answer: B – Lead II is standard for rhythm interpretation.
, 12.Artifact on an ECG tracing may be caused by:
A) Patient movement
B) Electrical interference
C) Loose electrodes
D) All of the above
Answer: D – Any of these can produce artifact.
13.Which part of the heart receives deoxygenated blood?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Aorta
Answer: B – Right atrium receives blood from systemic veins.
14.The SA node is located in the:
A) Right atrium near the SVC
B) AV node
C) Bundle of His
D) Left atrium
Answer: A – SA node is near superior vena cava in right atrium.
15.The AV node delays the impulse for approximately:
A) 0.04 sec
B) 0.12 sec
C) 0.20 sec
D) 0.30 sec
Answer: C – AV node delay allows atrial contraction before ventricles.
16.Which leads are considered limb leads?
A) I, II, III
B) V1–V6
C) aVR, aVL, aVF
D) Both A and C
Answer: D – Limb leads include I, II, III, aVR, aVL, aVF.
17.Which of the following is a precordial lead?
A) Lead I
B) aVR
C) V3
D) Lead II
Answer: C – V1–V6 are precordial (chest) leads.
18.The R wave represents:
A) Initial ventricular depolarization
B) Late ventricular depolarization
C) Atrial depolarization
D) AV node delay
Answer: B – R wave is the main upward deflection of ventricular depolarization.
19.ST segment elevation may indicate:
A) Ischemia
Electrocardiography for Healthcare
Professionals 6th Edition By Kathryn A.
Booth, Thomas Edward O'Brien Chapter
1-15
Electrocardiography Practice Questions
Chapter 1–3: ECG Basics & Heart Anatomy
1. What is the normal rate of the SA node?
A) 20–40 bpm
B) 60–100 bpm
C) 100–120 bpm
D) 40–60 bpm
Answer: B – SA node normally fires at 60–100 beats per minute.
2. The P wave represents:
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) Atrial repolarization
Answer: B – P wave corresponds to atrial depolarization.
3. The QRS complex represents:
A) Ventricular depolarization
B) Atrial depolarization
C) Ventricular repolarization
D) SA node firing
Answer: A – QRS = ventricular depolarization.
4. Which wave represents ventricular repolarization?
A) P wave
B) QRS complex
C) T wave
D) U wave
Answer: C – T wave = ventricular repolarization.
,5. Which interval represents the time from atrial depolarization to ventricular
depolarization?
A) QT interval
B) PR interval
C) ST segment
D) RR interval
Answer: B – PR interval reflects conduction from atria to ventricles.
6. A prolonged PR interval (>0.20 sec) indicates:
A) Normal conduction
B) First-degree AV block
C) Second-degree AV block
D) Bundle branch block
Answer: B – First-degree AV block delays AV node conduction.
7. Normal QRS duration is:
A) 0.04–0.10 sec
B) 0.10–0.12 sec
C) 0.12–0.20 sec
D) 0.20–0.25 sec
Answer: A – Normal QRS = 0.04–0.10 seconds.
8. The QT interval represents:
A) Atrial depolarization
B) Ventricular depolarization and repolarization
C) AV conduction
D) Ventricular relaxation only
Answer: B – QT includes ventricular depolarization + repolarization.
9. What is the normal axis of the heart on ECG?
A) 0–90°
B) –30° to +90°
C) 90–180°
D) –90° to 0°
Answer: B – Normal QRS axis: –30° to +90°.
10.The U wave may indicate:
A) Hypokalemia
B) Hyperkalemia
C) Myocardial infarction
D) Atrial fibrillation
Answer: A – Prominent U waves suggest low potassium.
11.Which lead is considered the “reference” for rhythm analysis?
A) Lead I
B) Lead II
C) Lead III
D) V1
Answer: B – Lead II is standard for rhythm interpretation.
, 12.Artifact on an ECG tracing may be caused by:
A) Patient movement
B) Electrical interference
C) Loose electrodes
D) All of the above
Answer: D – Any of these can produce artifact.
13.Which part of the heart receives deoxygenated blood?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Aorta
Answer: B – Right atrium receives blood from systemic veins.
14.The SA node is located in the:
A) Right atrium near the SVC
B) AV node
C) Bundle of His
D) Left atrium
Answer: A – SA node is near superior vena cava in right atrium.
15.The AV node delays the impulse for approximately:
A) 0.04 sec
B) 0.12 sec
C) 0.20 sec
D) 0.30 sec
Answer: C – AV node delay allows atrial contraction before ventricles.
16.Which leads are considered limb leads?
A) I, II, III
B) V1–V6
C) aVR, aVL, aVF
D) Both A and C
Answer: D – Limb leads include I, II, III, aVR, aVL, aVF.
17.Which of the following is a precordial lead?
A) Lead I
B) aVR
C) V3
D) Lead II
Answer: C – V1–V6 are precordial (chest) leads.
18.The R wave represents:
A) Initial ventricular depolarization
B) Late ventricular depolarization
C) Atrial depolarization
D) AV node delay
Answer: B – R wave is the main upward deflection of ventricular depolarization.
19.ST segment elevation may indicate:
A) Ischemia
