IBHRE CEPs Practice Exam 6 With 100% Correct Answers
1. Which structure in the heart is primarily responsible for coordinating atrial
contraction?
• A) Sinoatrial node
• B) Atrioventricular node
• C) Bundle of His
• Answer: A) Sinoatrial node
• Explanation: The sinoatrial (SA) node is the primary pacemaker of the heart and initiates
electrical impulses, leading to atrial contraction.
2. What is the main purpose of the QT interval on an ECG?
• A) To assess atrial depolarization
• B) To evaluate ventricular depolarization and repolarization
• C) To measure heart rate variability
• Answer: B) To evaluate ventricular depolarization and repolarization
• Explanation: The QT interval represents the time taken for the ventricles to depolarize and then
repolarize, reflecting ventricular electrical activity.
3. Which arrhythmia is characterized by a "sawtooth" pattern on ECG?
• A) Atrial flutter
• B) Atrial fibrillation
• C) Ventricular tachycardia
• Answer: A) Atrial flutter
• Explanation: Atrial flutter is characterized by "F-waves" that create a sawtooth pattern,
commonly seen in leads II, III, and aVF.
4. What does "AV block" refer to in cardiac conduction?
• A) A delay or interruption in the conduction between the atria and ventricles
• B) The cessation of electrical activity in the atria
• C) An increased heart rate caused by vagal stimulation
• Answer: A) A delay or interruption in the conduction between the atria and ventricles
• Explanation: AV block occurs when there is a disturbance in the conduction pathway between
the atria and ventricles, affecting heart rhythm.
5. Which medication is often used to convert atrial fibrillation to sinus rhythm?
• A) Amiodarone
• B) Warfarin
• C) Digoxin
, • Answer: A) Amiodarone
• Explanation: Amiodarone is an antiarrhythmic drug that can be used to convert atrial fibrillation
to normal sinus rhythm, especially in hemodynamically stable patients.
6. What is the most common complication of permanent pacemaker
implantation?
• A) Infection
• B) Thrombosis
• C) Lead dislodgment
• Answer: A) Infection
• Explanation: Infection at the implantation site is a common complication of permanent
pacemaker placement, requiring vigilant monitoring and possible intervention.
7. What is the role of the Bundle of His in cardiac conduction?
• A) Initiate the heartbeat
• B) Conduct impulses from the atria to the ventricles
• C) Synchronize atrial contraction
• Answer: B) Conduct impulses from the atria to the ventricles
• Explanation: The Bundle of His transmits electrical impulses from the AV node to the ventricles,
facilitating coordinated contraction.
8. Which parameter is critical for determining the success of catheter ablation?
• A) Presence of a hematoma
• B) Absence of arrhythmia after the procedure
• C) Length of hospital stay
• Answer: B) Absence of arrhythmia after the procedure
• Explanation: The primary goal of catheter ablation is to eliminate the targeted arrhythmia,
confirmed by the absence of arrhythmias during follow-up.
9. What type of pacemaker is used in patients with symptomatic bradycardia and
normal AV conduction?
• A) AAI pacemaker
• B) VVI pacemaker
• C) DDD pacemaker
• Answer: A) AAI pacemaker
• Explanation: An AAI pacemaker is suitable for patients with normal AV conduction, providing
pacing only when intrinsic atrial activity is absent.
10. What is a common cause of atrial fibrillation?
• A) Hypertension
• B) Coronary artery disease
1. Which structure in the heart is primarily responsible for coordinating atrial
contraction?
• A) Sinoatrial node
• B) Atrioventricular node
• C) Bundle of His
• Answer: A) Sinoatrial node
• Explanation: The sinoatrial (SA) node is the primary pacemaker of the heart and initiates
electrical impulses, leading to atrial contraction.
2. What is the main purpose of the QT interval on an ECG?
• A) To assess atrial depolarization
• B) To evaluate ventricular depolarization and repolarization
• C) To measure heart rate variability
• Answer: B) To evaluate ventricular depolarization and repolarization
• Explanation: The QT interval represents the time taken for the ventricles to depolarize and then
repolarize, reflecting ventricular electrical activity.
3. Which arrhythmia is characterized by a "sawtooth" pattern on ECG?
• A) Atrial flutter
• B) Atrial fibrillation
• C) Ventricular tachycardia
• Answer: A) Atrial flutter
• Explanation: Atrial flutter is characterized by "F-waves" that create a sawtooth pattern,
commonly seen in leads II, III, and aVF.
4. What does "AV block" refer to in cardiac conduction?
• A) A delay or interruption in the conduction between the atria and ventricles
• B) The cessation of electrical activity in the atria
• C) An increased heart rate caused by vagal stimulation
• Answer: A) A delay or interruption in the conduction between the atria and ventricles
• Explanation: AV block occurs when there is a disturbance in the conduction pathway between
the atria and ventricles, affecting heart rhythm.
5. Which medication is often used to convert atrial fibrillation to sinus rhythm?
• A) Amiodarone
• B) Warfarin
• C) Digoxin
, • Answer: A) Amiodarone
• Explanation: Amiodarone is an antiarrhythmic drug that can be used to convert atrial fibrillation
to normal sinus rhythm, especially in hemodynamically stable patients.
6. What is the most common complication of permanent pacemaker
implantation?
• A) Infection
• B) Thrombosis
• C) Lead dislodgment
• Answer: A) Infection
• Explanation: Infection at the implantation site is a common complication of permanent
pacemaker placement, requiring vigilant monitoring and possible intervention.
7. What is the role of the Bundle of His in cardiac conduction?
• A) Initiate the heartbeat
• B) Conduct impulses from the atria to the ventricles
• C) Synchronize atrial contraction
• Answer: B) Conduct impulses from the atria to the ventricles
• Explanation: The Bundle of His transmits electrical impulses from the AV node to the ventricles,
facilitating coordinated contraction.
8. Which parameter is critical for determining the success of catheter ablation?
• A) Presence of a hematoma
• B) Absence of arrhythmia after the procedure
• C) Length of hospital stay
• Answer: B) Absence of arrhythmia after the procedure
• Explanation: The primary goal of catheter ablation is to eliminate the targeted arrhythmia,
confirmed by the absence of arrhythmias during follow-up.
9. What type of pacemaker is used in patients with symptomatic bradycardia and
normal AV conduction?
• A) AAI pacemaker
• B) VVI pacemaker
• C) DDD pacemaker
• Answer: A) AAI pacemaker
• Explanation: An AAI pacemaker is suitable for patients with normal AV conduction, providing
pacing only when intrinsic atrial activity is absent.
10. What is a common cause of atrial fibrillation?
• A) Hypertension
• B) Coronary artery disease
