1. What is the most appropriate initial treatment for a patient with symptomatic sinus
bradycardia?
A. Synchronized cardioversion
B. Atropine
C. Amiodarone
D. Defibrillation
Answer: B) Atropine
Rationale: Sinus bradycardia can be treated with atropine, which increases heart rate by
inhibiting the vagus nerve's effects on the heart. If symptoms persist, further interventions like
pacing may be required.
2. What is the characteristic feature of atrial fibrillation on an ECG?
A. Sawtooth pattern of P waves
B. Irregularly irregular rhythm with no distinct P waves
C. Wide QRS complexes
D. P waves with a normal PR interval
Answer: B) Irregularly irregular rhythm with no distinct P waves
Rationale: Atrial fibrillation (AF) is characterized by a rapid, disorganized electrical activity in
the atria, leading to an absence of distinct P waves and an irregularly irregular rhythm. This can
result in an increased risk of clot formation.
3. Which of the following is a typical characteristic of atrial flutter on an ECG?
A. A P wave with a sawtooth pattern
B. Irregularly irregular rhythm
C. A prolonged PR interval
D. Wide QRS complexes
Answer: A) A P wave with a sawtooth pattern
,Rationale: Atrial flutter is characterized by a rapid, regular atrial rhythm with a distinctive
"sawtooth" pattern of flutter waves (P waves), typically occurring at a rate of 240–400 beats per
minute.
4. What is the first-line treatment for ventricular fibrillation?
A. Amiodarone
B. Lidocaine
C. Immediate defibrillation
D. Cardioversion
Answer: C) Immediate defibrillation
Rationale: Ventricular fibrillation is a life-threatening arrhythmia that requires immediate
defibrillation to restore normal cardiac rhythm and prevent death.
5. Which of the following is most likely to be seen in a 12-lead ECG of a patient experiencing a
myocardial infarction?
A. Wide QRS complex with absent P waves
B. ST-segment elevation in the leads corresponding to the affected myocardium
C. Shortened QT interval
D. Prominent U waves
Answer: B) ST-segment elevation in the leads corresponding to the affected myocardium
Rationale: ST-segment elevation in specific leads is a key diagnostic finding in myocardial
infarction (STEMI) and indicates acute injury to the heart muscle.
6. Which of the following medications is used to treat an acute episode of supraventricular
tachycardia (SVT)?
A. Amiodarone
B. Adenosine
C. Epinephrine
D. Lidocaine
, Answer: B) Adenosine
Rationale: Adenosine is the drug of choice to treat acute episodes of SVT as it temporarily
blocks conduction through the AV node, terminating the arrhythmia in most cases.
7. Which type of second-degree heart block is considered more serious and often requires a
pacemaker?
A. Type I (Wenckebach)
B. Type II
C. Type III
D. First-degree
Answer: B) Type II
Rationale: Type II second-degree AV block is more serious because it involves intermittent
conduction failure of the AV node without any progressive lengthening of the PR interval. It can
result in dropped beats, and often requires a pacemaker to prevent further complications.
8. Which of the following ECG findings is most characteristic of a heart with a bundle branch
block?
A. Prolonged PR interval
B. Wide QRS complex with a distinct notch in the R wave
C. Absent P waves
D. Tall, peaked T waves
Answer: B) Wide QRS complex with a distinct notch in the R wave
Rationale: A bundle branch block causes a delay in ventricular depolarization, leading to a
widened QRS complex. The characteristic notch or "rabbit ears" in the R wave are seen on the
ECG.
9. Which of the following is a typical ECG finding in a patient with a complete heart block
(third-degree AV block)?
A. The P waves are regular and march through the QRS complex.
B. P waves and QRS complexes are completely independent of each other.
bradycardia?
A. Synchronized cardioversion
B. Atropine
C. Amiodarone
D. Defibrillation
Answer: B) Atropine
Rationale: Sinus bradycardia can be treated with atropine, which increases heart rate by
inhibiting the vagus nerve's effects on the heart. If symptoms persist, further interventions like
pacing may be required.
2. What is the characteristic feature of atrial fibrillation on an ECG?
A. Sawtooth pattern of P waves
B. Irregularly irregular rhythm with no distinct P waves
C. Wide QRS complexes
D. P waves with a normal PR interval
Answer: B) Irregularly irregular rhythm with no distinct P waves
Rationale: Atrial fibrillation (AF) is characterized by a rapid, disorganized electrical activity in
the atria, leading to an absence of distinct P waves and an irregularly irregular rhythm. This can
result in an increased risk of clot formation.
3. Which of the following is a typical characteristic of atrial flutter on an ECG?
A. A P wave with a sawtooth pattern
B. Irregularly irregular rhythm
C. A prolonged PR interval
D. Wide QRS complexes
Answer: A) A P wave with a sawtooth pattern
,Rationale: Atrial flutter is characterized by a rapid, regular atrial rhythm with a distinctive
"sawtooth" pattern of flutter waves (P waves), typically occurring at a rate of 240–400 beats per
minute.
4. What is the first-line treatment for ventricular fibrillation?
A. Amiodarone
B. Lidocaine
C. Immediate defibrillation
D. Cardioversion
Answer: C) Immediate defibrillation
Rationale: Ventricular fibrillation is a life-threatening arrhythmia that requires immediate
defibrillation to restore normal cardiac rhythm and prevent death.
5. Which of the following is most likely to be seen in a 12-lead ECG of a patient experiencing a
myocardial infarction?
A. Wide QRS complex with absent P waves
B. ST-segment elevation in the leads corresponding to the affected myocardium
C. Shortened QT interval
D. Prominent U waves
Answer: B) ST-segment elevation in the leads corresponding to the affected myocardium
Rationale: ST-segment elevation in specific leads is a key diagnostic finding in myocardial
infarction (STEMI) and indicates acute injury to the heart muscle.
6. Which of the following medications is used to treat an acute episode of supraventricular
tachycardia (SVT)?
A. Amiodarone
B. Adenosine
C. Epinephrine
D. Lidocaine
, Answer: B) Adenosine
Rationale: Adenosine is the drug of choice to treat acute episodes of SVT as it temporarily
blocks conduction through the AV node, terminating the arrhythmia in most cases.
7. Which type of second-degree heart block is considered more serious and often requires a
pacemaker?
A. Type I (Wenckebach)
B. Type II
C. Type III
D. First-degree
Answer: B) Type II
Rationale: Type II second-degree AV block is more serious because it involves intermittent
conduction failure of the AV node without any progressive lengthening of the PR interval. It can
result in dropped beats, and often requires a pacemaker to prevent further complications.
8. Which of the following ECG findings is most characteristic of a heart with a bundle branch
block?
A. Prolonged PR interval
B. Wide QRS complex with a distinct notch in the R wave
C. Absent P waves
D. Tall, peaked T waves
Answer: B) Wide QRS complex with a distinct notch in the R wave
Rationale: A bundle branch block causes a delay in ventricular depolarization, leading to a
widened QRS complex. The characteristic notch or "rabbit ears" in the R wave are seen on the
ECG.
9. Which of the following is a typical ECG finding in a patient with a complete heart block
(third-degree AV block)?
A. The P waves are regular and march through the QRS complex.
B. P waves and QRS complexes are completely independent of each other.
