IBHRE CCDS EXAMINATION COMPLETE QUESTIONS
AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR JUST RELEASED
Question 1
A 72-year-old patient with symptomatic sinus node dysfunction experiences recurrent
dizziness despite medication adjustments. According to current pacing guidelines, which
intervention is most appropriate?
A. Implant a single-chamber ventricular pacemaker immediately
B. Continue observation without additional testing
C. Implant a permanent pacemaker because symptoms correlate with bradycardia
D. Start high-dose beta-blocker therapy
Correct Answer: C
Rationale: Symptomatic sinus node dysfunction with documented correlation between
symptoms and bradycardia is a Class I indication for permanent pacing. Observation is
inappropriate when symptoms are significant and attributable to bradycardia.
Question 2
During pacemaker implantation, which lead fixation mechanism is generally associated
with easier repositioning during the procedure?
A. Passive tined fixation
B. Active screw-in fixation
C. Epicardial patch fixation
D. Subcutaneous fixation
,Correct Answer: B
Rationale: Active fixation leads use a retractable screw that can be repositioned more
easily during implantation. Passive fixation leads depend on trabecular engagement and
may be less convenient for repeated repositioning.
Question 3
A dual-chamber pacemaker is programmed DDD 60–130 bpm. What is the primary
purpose of the post-ventricular atrial refractory period?
A. Increase ventricular pacing output
B. Prevent sensing of retrograde or far-field atrial signals
C. Shorten the AV delay automatically
D. Enhance battery longevity during exercise
Correct Answer: B
Rationale: The post-ventricular atrial refractory period prevents inappropriate atrial
sensing of retrograde P waves and far-field R waves, reducing pacemaker-mediated
tachycardia and inappropriate tracking.
Question 4
A patient with complete heart block has an atrial rate of 80 bpm and ventricular escape
rhythm of 32 bpm. Which pacing mode best preserves AV synchrony?
A. VVI
B. AAI
C. DDD
D. ODO
Correct Answer: C
,Rationale: DDD pacing senses and paces both chambers while maintaining AV
synchrony, making it the preferred mode for complete heart block when atrial activity is
intact.
Question 5
During device interrogation, intermittent high-frequency nonphysiologic signals are
recorded on the ventricular channel. Which problem is most likely responsible?
A. Atrial flutter
B. Lead fracture
C. Battery depletion
D. Pacemaker syndrome
Correct Answer: B
Rationale: Lead fracture commonly produces intermittent high-frequency noise and
oversensing. Atrial flutter creates organized atrial activity, not nonphysiologic
ventricular noise.
Question 6
A patient receives an ICD for primary prevention because of ischemic cardiomyopathy
and reduced ejection fraction. What is the principal goal of this therapy?
A. Improve myocardial contractility directly
B. Prevent sudden cardiac death from ventricular arrhythmias
C. Eliminate all premature ventricular contractions
D. Reduce blood pressure during exertion
Correct Answer: B
Rationale: Primary prevention ICD therapy is intended to reduce mortality by
terminating life-threatening ventricular tachycardia or ventricular fibrillation before
sudden cardiac death occurs.
, Question 7
Which programming strategy most effectively reduces inappropriate ICD shocks caused
by atrial fibrillation with rapid ventricular response?
A. Lower the VF detection threshold significantly
B. Disable all SVT discriminators
C. Use longer detection intervals and appropriate SVT discrimination
D. Program maximal shock energy only
Correct Answer: C
Rationale: Longer detection intervals and SVT discriminators improve specificity for
ventricular arrhythmias and reduce inappropriate shocks during atrial fibrillation with
rapid conduction.
Question 8
A patient with left bundle branch block, ejection fraction of 25%, and persistent heart
failure symptoms despite optimal medical therapy is evaluated for CRT. Which finding
most strongly supports CRT implantation?
A. Narrow QRS duration of 90 ms
B. QRS duration of 160 ms with left bundle branch block
C. Isolated premature atrial contractions
D. Sinus bradycardia without heart failure symptoms
Correct Answer: B
Rationale: A wide QRS, especially ≥150 ms with left bundle branch block, predicts the
greatest benefit from cardiac resynchronization therapy in symptomatic heart failure.
Question 9
During coronary sinus lead placement for CRT, what is the usual preferred target
location for the left ventricular lead?
AND DETAILED SOLUTIONS LATEST UPDATE THIS
YEAR JUST RELEASED
Question 1
A 72-year-old patient with symptomatic sinus node dysfunction experiences recurrent
dizziness despite medication adjustments. According to current pacing guidelines, which
intervention is most appropriate?
A. Implant a single-chamber ventricular pacemaker immediately
B. Continue observation without additional testing
C. Implant a permanent pacemaker because symptoms correlate with bradycardia
D. Start high-dose beta-blocker therapy
Correct Answer: C
Rationale: Symptomatic sinus node dysfunction with documented correlation between
symptoms and bradycardia is a Class I indication for permanent pacing. Observation is
inappropriate when symptoms are significant and attributable to bradycardia.
Question 2
During pacemaker implantation, which lead fixation mechanism is generally associated
with easier repositioning during the procedure?
A. Passive tined fixation
B. Active screw-in fixation
C. Epicardial patch fixation
D. Subcutaneous fixation
,Correct Answer: B
Rationale: Active fixation leads use a retractable screw that can be repositioned more
easily during implantation. Passive fixation leads depend on trabecular engagement and
may be less convenient for repeated repositioning.
Question 3
A dual-chamber pacemaker is programmed DDD 60–130 bpm. What is the primary
purpose of the post-ventricular atrial refractory period?
A. Increase ventricular pacing output
B. Prevent sensing of retrograde or far-field atrial signals
C. Shorten the AV delay automatically
D. Enhance battery longevity during exercise
Correct Answer: B
Rationale: The post-ventricular atrial refractory period prevents inappropriate atrial
sensing of retrograde P waves and far-field R waves, reducing pacemaker-mediated
tachycardia and inappropriate tracking.
Question 4
A patient with complete heart block has an atrial rate of 80 bpm and ventricular escape
rhythm of 32 bpm. Which pacing mode best preserves AV synchrony?
A. VVI
B. AAI
C. DDD
D. ODO
Correct Answer: C
,Rationale: DDD pacing senses and paces both chambers while maintaining AV
synchrony, making it the preferred mode for complete heart block when atrial activity is
intact.
Question 5
During device interrogation, intermittent high-frequency nonphysiologic signals are
recorded on the ventricular channel. Which problem is most likely responsible?
A. Atrial flutter
B. Lead fracture
C. Battery depletion
D. Pacemaker syndrome
Correct Answer: B
Rationale: Lead fracture commonly produces intermittent high-frequency noise and
oversensing. Atrial flutter creates organized atrial activity, not nonphysiologic
ventricular noise.
Question 6
A patient receives an ICD for primary prevention because of ischemic cardiomyopathy
and reduced ejection fraction. What is the principal goal of this therapy?
A. Improve myocardial contractility directly
B. Prevent sudden cardiac death from ventricular arrhythmias
C. Eliminate all premature ventricular contractions
D. Reduce blood pressure during exertion
Correct Answer: B
Rationale: Primary prevention ICD therapy is intended to reduce mortality by
terminating life-threatening ventricular tachycardia or ventricular fibrillation before
sudden cardiac death occurs.
, Question 7
Which programming strategy most effectively reduces inappropriate ICD shocks caused
by atrial fibrillation with rapid ventricular response?
A. Lower the VF detection threshold significantly
B. Disable all SVT discriminators
C. Use longer detection intervals and appropriate SVT discrimination
D. Program maximal shock energy only
Correct Answer: C
Rationale: Longer detection intervals and SVT discriminators improve specificity for
ventricular arrhythmias and reduce inappropriate shocks during atrial fibrillation with
rapid conduction.
Question 8
A patient with left bundle branch block, ejection fraction of 25%, and persistent heart
failure symptoms despite optimal medical therapy is evaluated for CRT. Which finding
most strongly supports CRT implantation?
A. Narrow QRS duration of 90 ms
B. QRS duration of 160 ms with left bundle branch block
C. Isolated premature atrial contractions
D. Sinus bradycardia without heart failure symptoms
Correct Answer: B
Rationale: A wide QRS, especially ≥150 ms with left bundle branch block, predicts the
greatest benefit from cardiac resynchronization therapy in symptomatic heart failure.
Question 9
During coronary sinus lead placement for CRT, what is the usual preferred target
location for the left ventricular lead?
