IBHRE Cardiac Device Specialist Exam — Questions and Answers

Question 1: Where is the 'slow pathway' targeted during catheter ablation of AVNRT?

Right superior pulmonary vein
Posteroseptal region near the coronary sinus os (Correct answer)
His bundle region
Anteroseptal tricuspid annulus

Correct answer: Posteroseptal region near the coronary sinus os

The slow AV nodal pathway is located in the posteroseptal region between the tricuspid annulus and coronary sinus os, corresponding to the inferior nodal extension.

Question 2: Post-procedure pseudoaneurysm formation at the femoral access site is most commonly associated with?

Use of vascular closure devices
Venous access with small sheaths
Anticoagulant reversal immediately after the procedure
Arterial access with inadequate hemostasis or high puncture (Correct answer)

Correct answer: Arterial access with inadequate hemostasis or high puncture

Pseudoaneurysms form when inadequate sealing of an arterial puncture allows persistent blood flow into surrounding tissues, most common after arterial access with poor compression.

Question 3: Air embolism during EP procedures is prevented primarily by?

Careful flushing and de-airing of all sheaths and catheters before insertion (Correct answer)
Using the smallest available catheter size
Using dry needles for vascular access
Rapid catheter insertion to minimize air entry time

Correct answer: Careful flushing and de-airing of all sheaths and catheters before insertion

Thoroughly flushing and de-airing all intravascular sheaths, introducers, and catheters with saline before insertion prevents air from entering the vasculature.

Question 4: What is the most appropriate initial treatment for a hemodynamically stable pediatric patient with SVT?

Electrical cardioversion
Intravenous adenosine
Vagal maneuvers (Correct answer)
Beta-blockers

Correct answer: Vagal maneuvers

For hemodynamically stable pediatric patients experiencing supraventricular tachycardia (SVT), vagal maneuvers are the most appropriate initial treatment. These non-invasive techniques, such as ice to the face or Valsalva maneuver, stimulate the vagus nerve, which can slow the heart rate and potentially terminate the SVT by increasing AV nodal block. If vagal maneuvers are unsuccessful, pharmacological interventions like adenosine may be considered.

Question 5: Which of the following is a key consideration when performing an electrophysiology study (EPS) on a pediatric patient?

The avoidance of radiation exposure
The preference for non-invasive techniques
The use of general anesthesia (Correct answer)
The need for larger catheter sizes

Correct answer: The use of general anesthesia

Performing an electrophysiology study (EPS) on pediatric patients often requires the use of general anesthesia. Children, especially younger ones, may not be able to remain still or cooperate for the extended duration of the procedure, which involves inserting catheters and inducing arrhythmias. General anesthesia ensures patient comfort, safety, and the ability to obtain accurate diagnostic information.

Question 6: Ibutilide is primarily indicated for acute pharmacological conversion of which arrhythmia?

Atrial flutter and atrial fibrillation (Correct answer)
Sinus tachycardia
Ventricular tachycardia
AVNRT

Correct answer: Atrial flutter and atrial fibrillation

Ibutilide is an IV Class III agent specifically approved for rapid pharmacological cardioversion of atrial flutter and atrial fibrillation.

Question 7: During a transseptal puncture for a left atrial ablation, the patient suddenly becomes hypotensive (BP 85/50 mmHg), tachycardic, and their jugular venous pressure becomes markedly elevated. On the fluoroscopy monitor, the cardiac silhouette appears enlarged. This clinical presentation is most consistent with which procedural complication?

Cardiac tamponade. (Correct answer)
A vasovagal reaction.
Aortic root puncture.
An air embolism.

Correct answer: Cardiac tamponade.

The combination of hypotension, elevated jugular venous pressure, and tachycardia (with muffled heart sounds often noted on physical exam) is known as Beck's triad, a classic sign of cardiac tamponade. This life-threatening complication can occur if the needle or sheath perforates the atrial free wall during a transseptal puncture, causing blood to accumulate in the pericardial space.

Question 8: What does 'bidirectional block' mean as an endpoint for cavo-tricuspid isthmus ablation?

Conduction block across the isthmus confirmed in both clockwise and counterclockwise directions (Correct answer)
Isolation of all four pulmonary veins
Block in both bundle branches simultaneously
AV nodal block in both antegrade and retrograde directions

Correct answer: Conduction block across the isthmus confirmed in both clockwise and counterclockwise directions

Bidirectional CTI block confirms complete ablation by demonstrating that impulses cannot traverse the isthmus in either direction, preventing flutter circuit re-establishment.

Question 9: Standard 0.5 mm lead equivalent aprons typically attenuate scattered radiation by approximately?

90–95% (Correct answer)
10–20%
99–100%
50–70%

Correct answer: 90–95%

Standard lead aprons attenuate approximately 90–95% of scattered radiation at diagnostic X-ray energies, substantially reducing operator dose.

Question 10: Why does dofetilide require mandatory 3-day in-hospital initiation?

Risk of QT prolongation and torsades de pointes (Correct answer)
Risk of hypertensive crisis
Risk of acute renal failure
Risk of severe bradycardia

Correct answer: Risk of QT prolongation and torsades de pointes

Dofetilide causes dose-dependent QT prolongation and can precipitate torsades de pointes, requiring in-hospital QTc and renal monitoring during initiation.

Question 11: An HV interval of 70 ms or greater found during an electrophysiology study in a syncope patient is significant because it indicates:

Accessory pathway-mediated tachycardia
Sinus node dysfunction
Significant infranodal conduction disease increasing risk of high-degree AV block (Correct answer)
Normal His-Purkinje conduction

Correct answer: Significant infranodal conduction disease increasing risk of high-degree AV block

An HV interval ≥70 ms reflects markedly prolonged His-Purkinje conduction and is a strong predictor of spontaneous high-degree or complete AV block, guiding pacemaker implantation.

Question 12: Which of the following structures is considered the primary and most consistent pathway for electrical impulse conduction between the right and left atria?

Bachmann's Bundle (Correct answer)
The Coronary Sinus Musculature
The Tendon of Todaro
The Crista Terminalis

Correct answer: Bachmann's Bundle

Bachmann's bundle is a prominent muscular bridge of parallel-aligned myocardial strands that connects the right and left atria, serving as the dominant pathway for physiological interatrial conduction. It originates from the anterior aspect of the sinoatrial node and travels across the interatrial groove to the left atrium. Disruption of this bundle can lead to interatrial block.

Question 13: What is the US regulatory annual occupational whole-body radiation dose limit for EP lab staff?

50 mSv/year (Correct answer)
1 mSv/year
5 mSv/year
100 mSv/year

Correct answer: 50 mSv/year

The NRC and NCRP set the annual occupational whole-body effective dose limit at 50 mSv (5 rem) per year for radiation workers.

Question 14: A patient with a VVI pacemaker presents for follow-up. The device log shows multiple episodes of pacing inhibition despite the patient's intrinsic rate being below the programmed lower rate limit. The intracardiac electrogram shows that after each intrinsic QRS complex, a second, smaller signal is consistently sensed on the ventricular channel, which inappropriately resets the pacing timer. What is the most likely cause of this pacing inhibition?

Crosstalk
Ventricular undersensing
Myopotential oversensing
T-wave oversensing (Correct answer)

Correct answer: T-wave oversensing

T-wave oversensing occurs when the device's sensing circuit incorrectly interprets the T-wave (cardiac repolarization) as an intrinsic R-wave. This extra 'sensed' event resets the pacemaker's timing cycle, leading to a pause and inhibition of pacing when it should occur. The description of a second, smaller signal consistently following each intrinsic QRS is the classic presentation of T-wave oversensing.

Question 15: High-density mapping catheters improve VT ablation procedures by?

Simultaneously recording from many electrodes to create detailed scar and activation maps (Correct answer)
Delivering higher ablation energy
Eliminating the need for fluoroscopy
Cooling the ablation site

Correct answer: Simultaneously recording from many electrodes to create detailed scar and activation maps

High-density catheters with multiple closely spaced electrodes capture more data points per map, providing higher resolution delineation of scar borders and critical VT isthmuses.

Question 16: A remote transmission from an asymptomatic 65-year-old patient with an ICD for primary prevention (ischemic cardiomyopathy, EF 30%) is flagged for a 12-beat run of non-sustained ventricular tachycardia (NSVT) at 155 bpm. The device functioned appropriately and did not deliver therapy. What is the most appropriate next step for the reviewing clinician?

Immediately call 911 for the patient as this is a medical emergency.
Reprogram the device remotely to increase the number of intervals to detect VT.
Admit the patient for an electrophysiology study and possible ablation.
Contact the patient to assess for symptoms and schedule a routine in-person follow-up. (Correct answer)

Correct answer: Contact the patient to assess for symptoms and schedule a routine in-person follow-up.

Brief, asymptomatic, non-sustained VT is a common finding on device interrogations and does not typically warrant immediate or emergent action in a stable patient. The appropriate response is to correlate the arrhythmia with any potential symptoms, ensure the patient is otherwise stable, and schedule a routine follow-up to review device settings and overall clinical status. Urgent intervention is not indicated for this isolated finding.

Question 17: Which of the following ECG findings is considered the only potentially diagnostic pattern for Brugada syndrome without provocative testing?

Deeply inverted T-waves in leads V2-V3 with preserved R-wave progression.
Coved-type ST-segment elevation of ≥2 mm in at least one right precordial lead (V1-V3) followed by a negative T-wave. (Correct answer)
ST-segment elevation >1 mm in leads II, III, and aVF.
Saddleback-shaped ST-segment elevation of ≥2 mm in V1-V2.

Correct answer: Coved-type ST-segment elevation of ≥2 mm in at least one right precordial lead (V1-V3) followed by a negative T-wave.

The Type 1 Brugada pattern is the only ECG finding considered diagnostic of Brugada Syndrome when associated with clinical criteria (e.g., syncope, family history of sudden death). It is defined by a coved-type ST-segment elevation of 2 mm or more in at least one of the right precordial leads (V1, V2, or V3), followed by a negative or biphasic T-wave.

Question 18: What does the radiation safety acronym ALARA stand for?

Always Limit All Radiation Activity
Automated Laser Alignment Radiation Assessment
As Low As Reasonably Achievable (Correct answer)
Absolute Limit of Allowable Radiation Amount

Correct answer: As Low As Reasonably Achievable

ALARA (As Low As Reasonably Achievable) is the foundational radiation protection principle requiring use of the lowest dose that achieves the clinical objective.

Question 19: What is the primary characteristic of Long QT Syndrome (LQTS) in children?

Consistently elevated heart rate
Irregular P waves
Prolonged QT interval on the ECG (Correct answer)
Shortened QT interval on the ECG

Correct answer: Prolonged QT interval on the ECG

Long QT Syndrome (LQTS) is a genetic heart condition characterized by a prolonged QT interval on an electrocardiogram (ECG), which represents the time it takes for the heart's ventricles to depolarize and repolarize. This extended repolarization phase makes the heart more susceptible to developing life-threatening arrhythmias, particularly Torsades de Pointes, which can lead to sudden cardiac arrest.

Question 20: Carotid sinus hypersensitivity is diagnosed when carotid sinus massage produces a ventricular pause of at least:

3 seconds (Correct answer)
5 seconds
4 seconds
2 seconds

Correct answer: 3 seconds

A ventricular pause of ≥3 seconds during carotid sinus massage defines the cardioinhibitory form of carotid sinus hypersensitivity.

Question 21: The vasodepressor type of vasovagal syncope is primarily characterized by:

Hypotension with little or no bradycardia (Correct answer)
Asystole lasting more than 3 seconds
Significant bradycardia without meaningful hypotension
Tachycardia as the dominant feature

Correct answer: Hypotension with little or no bradycardia

Vasodepressor syncope is defined by predominant hypotension due to peripheral vasodilation, with heart rate decreasing by less than 10% of peak value.

Question 22: Which of the following is the most common congenital arrhythmia in children?

Ventricular tachycardia
Supraventricular tachycardia (SVT) (Correct answer)
Bradycardia
Atrial fibrillation

Correct answer: Supraventricular tachycardia (SVT)

Supraventricular tachycardia (SVT) is the most frequently encountered congenital arrhythmia in the pediatric population. It involves rapid heart rates originating from above the ventricles, often due to re-entry circuits or abnormal automaticity. While many cases are benign and self-limiting, some may require intervention to prevent complications.

Question 23: Physical counterpressure maneuvers (PCMs) such as leg crossing with muscle tensing and handgrip are recommended as first-line treatment for:

Prodromal vasovagal syncope with warning symptoms (Correct answer)
Syncope due to complete AV block
Unexplained syncope without prodrome
Syncope due to ventricular tachycardia

Correct answer: Prodromal vasovagal syncope with warning symptoms

PCMs increase venous return and cardiac output during the prodromal phase of vasovagal syncope, aborting or delaying the syncopal episode without pharmacologic side effects.

Question 24: What is the primary physiological reason for the long absolute refractory period in ventricular myocardial cells?

To ensure the heart can respond to rapid successive stimuli.
To allow for complete atrial emptying before ventricular contraction.
To prevent summation of contractions and tetany of the cardiac muscle. (Correct answer)
To facilitate rapid repolarization and increase heart rate.

Correct answer: To prevent summation of contractions and tetany of the cardiac muscle.

The long absolute refractory period of the ventricular myocardium, which corresponds to phases 0, 1, and 2 of the action potential, prevents the initiation of a new contraction until the previous one is nearly complete. This is crucial for preventing tetanus (sustained contraction), which would be fatal as it would stop the heart from pumping blood effectively. It ensures that the ventricles have adequate time to relax and fill with blood before the next contraction.

Question 25: Amiodarone is primarily classified under which Vaughan Williams class?

Class II
Class I
Class IV
Class III (Correct answer)

Correct answer: Class III

Amiodarone is primarily a Class III antiarrhythmic that blocks potassium channels to prolong the action potential and refractory period.

Question 26: A 65-year-old male with a history of myocardial infarction presents with a regular, wide complex tachycardia at 150 bpm. The ECG shows a QRS duration of 160 ms, a northwest axis, and evidence of AV dissociation. In lead V1, there is a monophasic R wave. Which of the following is the most likely diagnosis?

Antidromic atrioventricular reentrant tachycardia
Ventricular tachycardia (Correct answer)
Supraventricular tachycardia with aberrancy
Atrial flutter with a bundle branch block

Correct answer: Ventricular tachycardia

Ventricular tachycardia (VT) is the most likely diagnosis. Several features in the description strongly suggest VT over a supraventricular rhythm with aberrancy. These include a history of structural heart disease (prior MI), QRS duration >140 ms, a northwest axis (extreme axis deviation), and the presence of AV dissociation. A monophasic R wave in V1 is also a classic morphological criterion for VT.

Question 27: What is the most common type of syncope in the general population?

Vasovagal syncope (Correct answer)
Orthostatic hypotension
Cardiac syncope
Carotid sinus syncope

Correct answer: Vasovagal syncope

Vasovagal (neurally mediated) syncope accounts for approximately 50% of all syncope cases and is the most prevalent form.

Question 28: Contrast-induced nephropathy during EP procedures is best prevented by?

Administering loop diuretics immediately before contrast injection
Using high contrast volumes for optimal imaging
Using only ionic high-osmolality contrast agents
Adequate pre-procedure IV hydration and minimizing contrast volume (Correct answer)

Correct answer: Adequate pre-procedure IV hydration and minimizing contrast volume

Pre-procedure intravenous hydration and minimizing total contrast volume are the most evidence-based strategies for preventing contrast-induced nephropathy.

Question 29: A device manufacturer issues a notification for a specific model of ICD due to a software anomaly that could, in rare circumstances, fail to deliver therapy during a life-threatening arrhythmia. According to the FDA's medical device recall classifications, what is this situation most likely to be classified as?

A Class II recall, because use of the product may cause temporary or medically reversible adverse health consequences.
A market withdrawal, because the action is a minor violation not subject to legal action by the FDA.
A Class I recall, because there is a reasonable probability that use of the product will cause serious adverse health consequences or death. (Correct answer)
A Class III recall, because use of the product is not likely to cause adverse health consequences.

Correct answer: A Class I recall, because there is a reasonable probability that use of the product will cause serious adverse health consequences or death.

A Class I recall is the most urgent classification. It is used in situations where there is a reasonable probability that the use of, or exposure to, a violative product will cause serious adverse health consequences or death. A failure to deliver life-saving ICD therapy falls squarely into this category.

Question 30: A patient with a dual-chamber pacemaker for sick sinus syndrome has a device check. The rhythm strip shows ventricular pacing spikes occurring 40ms after the peak of native, conducted QRS complexes. This observation is most consistent with which device issue?

T-wave oversensing
Loss of capture
Crosstalk
Ventricular undersensing (Correct answer)

Correct answer: Ventricular undersensing

The device is firing shortly after a native QRS, which means it failed to 'see' the intrinsic ventricular event. This is the definition of undersensing. To correct this, the ventricular sensitivity needs to be made more sensitive by decreasing the mV value (e.g., from 4.0 mV to 2.0 mV). Crosstalk involves inappropriate inhibition of ventricular output due to oversensing the atrial pacing stimulus. T-wave oversensing would involve sensing the T-wave and potentially inhibiting the next needed pace. Loss of capture means pacing spikes are not followed by a QRS.

Question 31: What INR range is targeted for warfarin anticoagulation in atrial fibrillation for stroke prevention?

1.5–2.5
2.0–3.0 (Correct answer)
3.0–4.0
1.0–1.5

Correct answer: 2.0–3.0

The target INR for stroke prevention with warfarin in non-valvular atrial fibrillation is 2.0–3.0, balancing thromboembolic and bleeding risk.

Question 32: What key safety advantage does cryoablation offer compared to radiofrequency ablation?

Reversible freezing allows testing before permanent ablation (Correct answer)
It cannot create permanent lesions
It requires less fluoroscopy
It uses higher temperatures for faster lesions

Correct answer: Reversible freezing allows testing before permanent ablation

Cryomapping at around -30°C produces reversible ice injury, allowing assessment of effects such as AV block before committing to permanent cryoablation at -70°C.

Question 33: During a complex ablation procedure requiring significant fluoroscopy time, which of the following actions is MOST effective for reducing the primary operator's radiation exposure, in accordance with ALARA (As Low As Reasonably Achievable) principles?

Increasing the distance between the x-ray source (tube) and the patient.
Using the lowest possible frame rate (pulse rate) for fluoroscopy. (Correct answer)
Wearing two lead aprons for additional shielding.
Maximizing the use of magnification modes to improve image clarity.

Correct answer: Using the lowest possible frame rate (pulse rate) for fluoroscopy.

Reducing the fluoroscopy frame rate (e.g., from 15 to 7.5 pulses per second) directly decreases the amount of radiation emitted per unit of time, significantly lowering the total dose to both the patient and staff. While distance and shielding are key ALARA principles, frame rate reduction offers one of the most substantial dose reductions that can be easily implemented. Maximizing magnification increases the radiation dose, and increasing the source-to-patient distance also increases patient dose.

Question 34: What is the primary purpose of the Mode Switch feature in a dual-chamber implantable device?

To increase the pacing rate during exercise using a blended sensor
To prevent pacemaker-mediated tachycardia by extending the post-ventricular atrial refractory period (PVARP)
To conserve battery by switching to a VVI mode at night
To prevent rapid ventricular pacing in response to a detected atrial tachyarrhythmia (Correct answer)

Correct answer: To prevent rapid ventricular pacing in response to a detected atrial tachyarrhythmia

The primary function of Mode Switch is to protect the patient from inappropriately rapid ventricular pacing. In a tracking mode like DDD, if the patient develops an atrial tachyarrhythmia (e.g., atrial fibrillation), the device would try to pace the ventricle at that same high rate. Mode Switch detects the high atrial rate and automatically changes the pacing mode to a non-tracking mode (e.g., DDI, VVIR), decoupling the ventricular pacing from the chaotic atrial rhythm.

Question 35: Lidocaine (Class IB) is most effective for treating which type of arrhythmia?

Sinus node dysfunction
Ventricular tachycardia and fibrillation (Correct answer)
Supraventricular tachycardia
Atrial fibrillation

Correct answer: Ventricular tachycardia and fibrillation

Lidocaine preferentially suppresses ischemic myocardium and is used for ventricular tachycardia and fibrillation, particularly in the setting of acute myocardial infarction.

Question 36: Which of the following conditions is essential for the initiation and maintenance of a re-entrant tachyarrhythmia?

A region of unidirectional conduction block. (Correct answer)
Enhanced automaticity in a focal group of cells.
A long refractory period relative to the conduction time around the circuit.
Homogeneous conduction velocity throughout the myocardium.

Correct answer: A region of unidirectional conduction block.

Re-entry requires three conditions: 1) a circuit, 2) a region of slow conduction within that circuit, and 3) a unidirectional block. This block forces the impulse to travel in one direction around the circuit, allowing the tissue proximal to the block to recover excitability before the wavefront returns, thus sustaining the arrhythmia.

Question 37: Phrenic nerve palsy is a recognized complication most associated with which ablation target?

VT substrate ablation in the LV
His bundle ablation
Cavo-tricuspid isthmus ablation
Right-sided pulmonary vein isolation (Correct answer)

Correct answer: Right-sided pulmonary vein isolation

The right phrenic nerve runs near the right pulmonary veins and right atrium, making phrenic nerve injury a recognized risk during right-sided PVI.

Question 38: The standard tilt table test is typically performed at what upright angle?

70 degrees (Correct answer)
60 degrees
45 degrees
90 degrees

Correct answer: 70 degrees

The Westminster protocol and most international guidelines recommend a tilt angle of 70 degrees as the standard for evaluating neurally mediated syncope.

Question 39: Pulmonary vein isolation is the cornerstone ablation strategy for which arrhythmia?

Ventricular tachycardia
AVNRT
Typical atrial flutter
Atrial fibrillation (Correct answer)

Correct answer: Atrial fibrillation

Pulmonary vein isolation electrically disconnects the pulmonary veins from the left atrium, eliminating the primary triggers of atrial fibrillation originating from these structures.

Question 40: A modern pacemaker's ventricular automatic capture feature confirms capture after each pacing stimulus by looking for an evoked response. To avoid misinterpreting the pacing artifact's afterpotential as a captured beat, the sensing amplifier is blanked for a short period. What is this afterpotential?

The intrinsic R-wave that occurs just after the pacing spike
A far-field signal from the contralateral chamber
An electromagnetic interference signal generated by the pulse generator
A residual electrical charge at the electrode-myocardium interface following the pacing stimulus (Correct answer)

Correct answer: A residual electrical charge at the electrode-myocardium interface following the pacing stimulus

Following the delivery of a pacing stimulus, a residual electrical charge, known as the polarization artifact or afterpotential, develops at the electrode-tissue interface. This signal can be large enough to be sensed by the pacemaker's own amplifier. Automatic capture algorithms must differentiate this artifact from the true evoked response of depolarized myocardial tissue by using a short blanking period to allow the polarization artifact to dissipate.

Question 41: An active patient with an ICD for primary prevention receives an inappropriate shock. The stored intracardiac electrogram (EGM) shows a stable sinus rhythm, but the ventricular sensing channel is obscured by high-frequency, non-physiologic signals that are counted in the tachyarrhythmia zone, leading to therapy. What is the most likely cause of these signals?

Pacemaker-mediated tachycardia
Atrial fibrillation with rapid ventricular response
T-wave oversensing
Lead noise from a conductor fracture or insulation breach (Correct answer)

Correct answer: Lead noise from a conductor fracture or insulation breach

High-frequency, non-physiologic signals ('noise') on the ventricular EGM are a classic sign of a lead integrity issue, such as a conductor wire fracture or an insulation breach. This noise can be misinterpreted by the device as ventricular fibrillation, leading to inappropriate shocks. T-wave oversensing would appear as double-counting of each QRS-T complex. Atrial fibrillation would show a physiologic, though irregular, ventricular rhythm. PMT is a paced rhythm and would not appear as high-frequency noise.

Question 42: Which class of antiarrhythmic drug works by blocking fast sodium channels?

Class I (Correct answer)
Class III
Class IV
Class II

Correct answer: Class I

Class I antiarrhythmic drugs block fast sodium channels, slowing phase 0 depolarization and conduction velocity.

Question 43: Femoral venous access for right-sided cardiac ablation routes catheters to the heart via?

The coronary sinus directly
The superior vena cava
The inferior vena cava (Correct answer)
The subclavian vein

Correct answer: The inferior vena cava

Catheters introduced through the femoral vein pass superiorly through the inferior vena cava to enter the right atrium and right ventricle.

Question 44: The pre-procedure 'time-out' in the EP lab is performed to?

Prepare anticoagulation medications
Calculate estimated radiation dose for the procedure
Allow equipment to reach operating temperature
Verify patient identity, procedure type, and ensure full team communication (Correct answer)

Correct answer: Verify patient identity, procedure type, and ensure full team communication

The procedural time-out is a Joint Commission-required safety check verifying correct patient identity, procedure, and site while promoting team communication to prevent never events.

Question 45: Zero-fluoroscopy catheter ablation relies primarily on which technology to navigate catheters without X-ray?

Intraoperative MRI
Electroanatomic mapping systems (Correct answer)
Real-time CT imaging
Intracardiac ultrasound alone

Correct answer: Electroanatomic mapping systems

Zero-fluoroscopy ablation uses electroanatomic mapping systems such as CARTO to navigate and position catheters using magnetic or impedance-based tracking without X-ray.

Question 46: Contact force sensing catheters improve ablation outcomes by?

Measuring the force applied between catheter tip and tissue (Correct answer)
Reducing patient radiation exposure
Preventing thrombus formation on the catheter
Increasing the mapping point acquisition speed

Correct answer: Measuring the force applied between catheter tip and tissue

Contact force sensing directly measures the mechanical force applied to cardiac tissue, enabling more consistent lesion formation and reducing perforation risk.

Question 47: Monitoring during EP procedural sedation must include continuous assessment of?

Core body temperature alone
Level of consciousness, respiratory rate, oxygen saturation, and vital signs (Correct answer)
ECG tracing only
Blood pressure alone

Correct answer: Level of consciousness, respiratory rate, oxygen saturation, and vital signs

Safe procedural sedation requires continuous monitoring of consciousness level, respiratory status, oxygen saturation, and hemodynamics to detect respiratory depression early.

Question 48: A 65-year-old patient is undergoing an electrophysiology study. Programmed electrical stimulation reveals that a premature impulse delivered during the last two-thirds of the T-wave on the surface ECG is able to initiate a ventricular tachyarrhythmia. This premature impulse most likely fell during which period of the ventricular action potential?

Effective Refractory Period (ERP)
Supranormal Period
Absolute Refractory Period (ARP)
Relative Refractory Period (RRP) (Correct answer)

Correct answer: Relative Refractory Period (RRP)

The Relative Refractory Period (RRP) corresponds to the latter part of Phase 3 of the cardiac action potential, which aligns with the mid-to-end portion of the T-wave. During the RRP, most voltage-gated Na+ channels have recovered from inactivation, and a stronger-than-normal stimulus can elicit a new action potential, potentially leading to arrhythmias like the R-on-T phenomenon.

Question 49: Which serious complication is uniquely associated with transseptal puncture for left-sided EP procedures?

Cardiac tamponade from aortic or atrial perforation (Correct answer)
Pneumothorax
Complete heart block
Lead dislodgement

Correct answer: Cardiac tamponade from aortic or atrial perforation

Transseptal puncture to access the left atrium carries risk of cardiac tamponade if the needle inadvertently perforates the aorta, atrial free wall, or pericardium.

Question 50: A patient with a new CRT-D device for heart failure is seen for follow-up. Device interrogation reveals a biventricular pacing percentage of only 82%. The event log shows that most of the non-paced beats are due to intrinsic ventricular conduction following a sensed atrial event. Which programming adjustment is most likely to increase the biventricular pacing percentage?

Lengthening the post-ventricular atrial refractory period (PVARP)
Activating a ventricular sense response feature
Shortening the sensed atrioventricular (AV) delay (Correct answer)
Increasing the lower rate limit to 80 bpm

Correct answer: Shortening the sensed atrioventricular (AV) delay

To maximize biventricular pacing, the device must deliver its pacing stimulus before the patient's own conduction system depolarizes the ventricles. If intrinsic conduction is occurring, it means the programmed AV delay is too long. Shortening the sensed AV delay will allow the device to pace the ventricles sooner after a sensed P-wave, 'winning the race' against the intrinsic conduction and thereby increasing the percentage of biventricular pacing. While other features exist, shortening the AV delay is the most direct and fundamental adjustment for this specific problem.

Question 51: The primary purpose of open-irrigated tip catheters in RF ablation is?

To reduce total procedure time
To increase lesion surface temperature
To allow larger, deeper lesions by preventing surface char formation (Correct answer)
To eliminate the need for electroanatomic mapping

Correct answer: To allow larger, deeper lesions by preventing surface char formation

Saline irrigation cools the catheter-tissue interface, preventing char and coagulum formation and allowing delivery of higher power to create larger, deeper lesions.

Question 52: What catheter tip temperature range is typically targeted during radiofrequency ablation?

55–70°C (Correct answer)
25–35°C
75–85°C
45–55°C

Correct answer: 55–70°C

RF ablation targets catheter tip temperatures of 55–70°C to achieve effective tissue destruction while avoiding char formation and impedance rises.

Question 53: The spontaneous Phase 4 depolarization characteristic of pacemaker cells in the sinoatrial (SA) node is primarily mediated by which ionic current?

Outward potassium current (IKr)
Inward L-type calcium current (ICa-L)
Inward fast sodium current (INa)
Inward 'funny' current (If) (Correct answer)

Correct answer: Inward 'funny' current (If)

The 'funny' current (If) is a unique inward current carried primarily by sodium ions that is activated by hyperpolarization at the end of Phase 3. This slow influx of positive charge gradually depolarizes the cell membrane during Phase 4, moving it towards the threshold potential to initiate the next action potential.

Question 54: Which arrhythmia is typically associated with a prolonged QT interval and can lead to Torsades de Pointes?

Ventricular tachycardia
Atrial fibrillation
Long QT syndrome (Correct answer)
Bradycardia

Correct answer: Long QT syndrome

Long QT syndrome (LQTS) is a disorder of the heart's electrical activity characterized by a prolonged QT interval on the electrocardiogram. This prolongation increases the risk of developing a life-threatening polymorphic ventricular tachycardia called Torsades de Pointes. Torsades de Pointes can lead to symptoms such as syncope, seizures, or even sudden cardiac death, making LQTS a serious condition.

Question 55: Which drug should be avoided in Wolff-Parkinson-White syndrome with atrial fibrillation because it enhances accessory pathway conduction?

Procainamide
Flecainide
Amiodarone
Digoxin (Correct answer)

Correct answer: Digoxin

Digoxin can enhance conduction through the accessory pathway in WPW, potentially precipitating ventricular fibrillation during atrial fibrillation.

Question 56: Informed consent for EP ablation procedures must include discussion of?

Financial costs and insurance coverage only
The operator's personal experience level only
Risks, benefits, alternatives, and expected outcomes (Correct answer)
Only the benefits and expected success rates

Correct answer: Risks, benefits, alternatives, and expected outcomes

Informed consent requires complete disclosure of procedure risks, benefits, reasonable alternatives, and expected outcomes to allow autonomous patient decision-making.

Question 57: During which phase of the ventricular myocyte action potential is the cell membrane absolutely refractory, meaning it cannot be depolarized to generate another action potential regardless of stimulus strength?

Phase 0, Phase 1, Phase 2, and the initial part of Phase 3 (Correct answer)
The latter half of Phase 3
Phase 4
Phase 0, Phase 1, and the early part of Phase 2

Correct answer: Phase 0, Phase 1, Phase 2, and the initial part of Phase 3

The Absolute Refractory Period (ARP) lasts from the onset of Phase 0 until the cell has repolarized to approximately -50mV to -60mV, which occurs during Phase 3. Throughout Phases 0, 1, and 2, the voltage-gated sodium channels are in an open or inactivated state and cannot be reopened by a new stimulus, rendering the cell unexcitable.

Question 58: What is the primary function of the sinoatrial (SA) node in the heart?

To conduct impulses from the atria to the ventricles
To initiate and regulate the heart's electrical impulses (Correct answer)
To delay impulses to allow ventricular filling
To control the contraction of the ventricles

Correct answer: To initiate and regulate the heart's electrical impulses

The sinoatrial (SA) node is often referred to as the heart's natural pacemaker. It is a specialized cluster of cells located in the right atrium that spontaneously generates electrical impulses. These impulses then spread throughout the atria, causing them to contract, and subsequently travel to the ventricles, initiating the entire cardiac cycle and regulating heart rate.

Question 59: Which component of a pacemaker or ICD is responsible for detecting the heart's intrinsic electrical activity?

The pulse generator
The battery
The lead(s) (Correct answer)
The case

Correct answer: The lead(s)

The leads are crucial components of pacemakers and ICDs, serving as the communication link between the pulse generator and the heart. They are responsible for both delivering electrical impulses to the heart (pacing) and sensing the heart's own intrinsic electrical activity. This sensing capability allows the device to respond appropriately, pacing only when needed and inhibiting pacing when the heart's natural rhythm is sufficient.

Question 60: Which antiarrhythmic drug is contraindicated in structural heart disease due to increased mortality demonstrated in the CAST trial?

Flecainide (Correct answer)
Metoprolol
Sotalol
Amiodarone

Correct answer: Flecainide

Flecainide (Class IC) is contraindicated in structural heart disease because the CAST trial showed it significantly increased mortality in post-MI patients.

Question 61: Sotalol combines the pharmacological actions of which two Vaughan Williams classes?

Class III and Class IV
Class I and Class II
Class II and Class III (Correct answer)
Class I and Class IV

Correct answer: Class II and Class III

Sotalol combines Class II (beta-blocking) and Class III (potassium channel blocking) actions, reducing heart rate and prolonging repolarization.

Question 62: Which of the following lifestyle modifications is a cornerstone of management for patients with POTS?

High fluid intake (2–3 L/day), high sodium diet, and compression garments (Correct answer)
Elimination of all aerobic exercise to prevent tachycardia
Fluid restriction and low-sodium diet to reduce cardiac preload
Strict bed rest to minimize orthostatic stress

Correct answer: High fluid intake (2–3 L/day), high sodium diet, and compression garments

Increasing fluid and sodium intake expands intravascular volume, while compression garments reduce venous pooling in the lower extremities, together reducing POTS symptoms.

Question 63: In cardiac electrophysiology, what is an "ablation" procedure primarily used for?

To diagnose coronary artery disease
To monitor blood pressure
To implant a pacemaker or defibrillator
To destroy or isolate areas of heart tissue that are causing abnormal electrical signals (Correct answer)

Correct answer: To destroy or isolate areas of heart tissue that are causing abnormal electrical signals

Cardiac ablation is a therapeutic procedure used to treat various arrhythmias by targeting and neutralizing the specific heart tissue responsible for generating or sustaining abnormal electrical signals. Using heat (radiofrequency ablation) or cold (cryoablation), the procedure creates small scars that block the faulty electrical pathways. This effectively restores a normal heart rhythm and prevents future episodes of arrhythmia.

Question 64: A patient is undergoing implantation of a biventricular pacemaker for cardiac resynchronization therapy. The physician is attempting to place the left ventricular lead via the coronary sinus. Which major cardiac vein is a direct tributary of the coronary sinus and runs in the posterior interventricular groove?

Middle Cardiac Vein (Correct answer)
Anterior Cardiac Vein
Great Cardiac Vein
Small Cardiac Vein

Correct answer: Middle Cardiac Vein

The Middle Cardiac Vein, also known as the posterior interventricular vein, is the largest proximal tributary of the coronary sinus. It courses alongside the posterior descending artery in the posterior interventricular groove and drains into the coronary sinus near the right atrium, making it a key vessel considered for left ventricular lead placement.

Question 65: How does dronedarone structurally differ from amiodarone?

It is a pure beta-blocker
It is non-iodinated (Correct answer)
It has a longer half-life
It has higher iodine content

Correct answer: It is non-iodinated

Dronedarone is a non-iodinated benzofuran derivative developed to retain antiarrhythmic efficacy while eliminating iodine-related thyroid and pulmonary toxicity.

Question 66: Which arrhythmia is characterized by a "sawtooth" pattern on an electrocardiogram (ECG)?

Premature ventricular contractions
Atrioventricular block
Ventricular fibrillation
Atrial flutter (Correct answer)

Correct answer: Atrial flutter

Atrial flutter is an arrhythmia characterized by a rapid, regular atrial rhythm, typically between 250-350 beats per minute. This rapid atrial activity produces a distinctive 'sawtooth' pattern on the electrocardiogram (ECG) in leads II, III, and aVF, which is a hallmark diagnostic feature. This pattern results from a re-entrant circuit within the right atrium.

Question 67: A 58-year-old patient presents to the clinic for a follow-up visit. They mention having intermittent, crushing chest pain over the past week, but are currently pain-free. The ECG shows deeply inverted, symmetric T-waves in leads V2 and V3, with minimal (<1mm) ST-segment elevation and preserved R-wave progression. What is the most likely diagnosis?

Wellens' syndrome (Correct answer)
Acute pericarditis
Left ventricular hypertrophy with strain
Brugada syndrome

Correct answer: Wellens' syndrome

The ECG findings described are characteristic of Wellens' syndrome (specifically Type B). This pattern, often seen when the patient is pain-free, is highly specific for a critical, proximal stenosis of the left anterior descending (LAD) artery and indicates a high risk of an impending large anterior wall myocardial infarction.

Question 68: Catheter ablation of typical right atrial flutter creates a lesion line across which structure?

Superior vena cava-right atrium junction
Left atrial posterior wall
Cavo-tricuspid isthmus (Correct answer)
His bundle region

Correct answer: Cavo-tricuspid isthmus

The cavo-tricuspid isthmus (CTI) is the critical slow conduction zone for typical flutter, and linear ablation across it terminates and prevents recurrence.

Question 69: A patient with a dual-chamber pacemaker presents with palpitations. Device interrogation reveals a tachycardia with a ventricular paced rate at the programmed upper tracking rate. The intracardiac electrogram shows a consistent 1:1 ventriculoatrial (VA) conduction pattern where a ventricular paced event is followed by a retrograde atrial sensed event, which then triggers the next ventricular paced event. What is the most likely diagnosis?

Runaway pacemaker
Sensor-indicated tachycardia
Pacemaker-mediated tachycardia (PMT) (Correct answer)
Atrial fibrillation with rapid ventricular response

Correct answer: Pacemaker-mediated tachycardia (PMT)

This scenario describes a classic endless loop or pacemaker-mediated tachycardia (PMT). PMT is a reentrant arrhythmia where the pacemaker forms the antegrade limb (atrial sensing to ventricular pacing) and the patient's native conduction system provides the retrograde limb (ventricle to atrium). The cycle of V-pace -> retrograde P-wave -> A-sense -> V-pace maintains the tachycardia.

Question 70: Quinidine syncope is caused by which ECG and electrophysiological phenomenon?

Torsades de pointes from QT prolongation (Correct answer)
PR interval prolongation
ST-segment elevation
New bundle branch block

Correct answer: Torsades de pointes from QT prolongation

Quinidine syncope results from torsades de pointes caused by quinidine's potassium channel blocking effect prolonging the QT interval.

Question 71: During VT ablation, substrate mapping primarily identifies?

Pulmonary vein triggers causing VT
Low-voltage scar areas harboring abnormal electrograms that sustain VT (Correct answer)
Normal sinus node tissue to preserve
Healthy myocardium to target for ablation

Correct answer: Low-voltage scar areas harboring abnormal electrograms that sustain VT

Substrate mapping identifies low-voltage scar tissue and late/fragmented electrograms that form the critical conducting channels sustaining ventricular tachycardia circuits.

Question 72: Procainamide's active metabolite NAPA primarily exhibits which class of antiarrhythmic activity?

Class II
Class III (Correct answer)
Class I
Class IV

Correct answer: Class III

NAPA (N-acetylprocainamide) is a Class III antiarrhythmic that blocks IKr, prolonging the action potential duration and QT interval.

Question 73: On an implantable loop recorder (ILR) in a patient with recurrent syncope, which finding best supports a neurally mediated (vasovagal) mechanism?

Rapid ventricular response during atrial fibrillation
Gradual progressive bradycardia leading to asystole coinciding with syncope (Correct answer)
Sudden onset complete AV block without preceding slowing
Sustained monomorphic ventricular tachycardia

Correct answer: Gradual progressive bradycardia leading to asystole coinciding with syncope

A gradual progressive sinus bradycardia followed by asystole during spontaneous syncope on ILR is the hallmark ILR pattern of neurally mediated syncope.

Question 74: Ranolazine's antiarrhythmic properties are primarily due to inhibition of which sodium current?

IKs
Late INa (Correct answer)
Peak INa
IKr

Correct answer: Late INa

Ranolazine inhibits the late (persistent) sodium current, reducing intracellular sodium and calcium overload that can trigger arrhythmias.

Question 75: Which strategy is most effective at reducing radiation dose in the EP lab?

Increasing tube voltage for all acquisitions
Restricting to PA projections only
Using high frame-rate continuous fluoroscopy
Minimizing fluoroscopy time and using beam collimation (Correct answer)

Correct answer: Minimizing fluoroscopy time and using beam collimation

Minimizing fluoroscopy time, collimating the X-ray field to the region of interest, and using pulsed low-frame-rate fluoroscopy are the most impactful dose reduction strategies.

Question 76: The autonomic response in vasovagal syncope involves activation of which reflex?

Bainbridge reflex
Hering-Breuer reflex
Bezold-Jarisch reflex (Correct answer)
Cushing reflex

Correct answer: Bezold-Jarisch reflex

The Bezold-Jarisch reflex, triggered by activation of cardiac C-fibers (mechanoreceptors) in the inferior left ventricular wall, causes reflex bradycardia and vasodilation.

Question 77: During Phase 0 of the cardiac action potential in a ventricular myocyte, the rapid depolarization is primarily caused by the influx of which ion?

Calcium (Ca2+)
Chloride (Cl-)
Sodium (Na+) (Correct answer)
Potassium (K+)

Correct answer: Sodium (Na+)

Phase 0, the rapid upstroke of the action potential in ventricular and Purkinje fibers, is caused by a sudden, massive influx of sodium ions (Na+) through fast voltage-gated sodium channels. This rapid influx causes the membrane potential to quickly become positive.

Question 78: A 78-year-old male with persistent atrial fibrillation (CHA₂DS₂-VASc score of 4) is scheduled for a dual-chamber pacemaker implantation. He is currently on warfarin with a therapeutic INR. Based on the landmark BRUISE CONTROL trial, what is the most appropriate strategy for managing his anticoagulation around the time of surgery?

Stop warfarin 5 days prior, do not bridge with heparin, and resume warfarin after the procedure.
Continue uninterrupted warfarin, ensuring the INR is within the therapeutic range (2.0-3.0). (Correct answer)
Stop warfarin 5 days prior and bridge with therapeutic low-molecular-weight heparin.
Switch to a direct oral anticoagulant (DOAC) two weeks before the procedure and hold it for 48 hours pre-procedure.

Correct answer: Continue uninterrupted warfarin, ensuring the INR is within the therapeutic range (2.0-3.0).

The BRUISE CONTROL trial demonstrated that continuing warfarin therapy was superior to bridging with heparin, resulting in a significant reduction in the incidence of clinically significant device pocket hematomas (3.5% vs. 16%). This practice avoids the increased bleeding risk associated with heparin bridging and the thromboembolic risk of stopping anticoagulation altogether.

Question 79: An ICD is programmed with SVT discriminators to prevent inappropriate shocks. Which of the following findings during a high-rate episode would most strongly suggest a diagnosis of VT, causing the device to override SVT criteria and deliver therapy?

A sudden onset of the tachycardia
1:1 atrioventricular (AV) association
A stable R-R interval
AV dissociation (Correct answer)

Correct answer: AV dissociation

AV dissociation, where the atria and ventricles beat independently (often with the ventricular rate being faster than the atrial rate), is a highly specific marker for ventricular tachycardia (VT). ICDs use this as a powerful discriminator. If AV dissociation is detected, it strongly indicates a ventricular origin, prompting the device to classify the rhythm as VT and deliver therapy, often overriding other criteria that might suggest SVT.

Question 80: Fludrocortisone reduces syncope primarily by:

Decreasing peripheral vascular resistance
Blocking vagal efferent signals to the heart
Increasing blood volume via renal sodium and water retention (Correct answer)
Increasing heart rate through sympathetic stimulation

Correct answer: Increasing blood volume via renal sodium and water retention

Fludrocortisone is a synthetic mineralocorticoid that promotes renal sodium retention and fluid expansion, increasing central blood volume and reducing orthostatic hypotension.

Question 81: POTS (Postural Orthostatic Tachycardia Syndrome) is defined by a heart rate increase of at least how many beats per minute upon standing within 10 minutes, without orthostatic hypotension?

50 bpm
40 bpm
20 bpm
30 bpm (Correct answer)

Correct answer: 30 bpm

POTS requires an increase in heart rate of ≥30 bpm (or HR ≥120 bpm) within 10 minutes of standing without a concurrent drop in blood pressure ≥20 mmHg.

Question 82: How should a known latex allergy be managed for a patient undergoing EP catheter ablation?

No special precautions are needed for brief procedures
Use latex-free gloves and equipment throughout the entire procedure (Correct answer)
Administer prophylactic epinephrine before the procedure only
Cancel the procedure and recommend open surgical repair instead

Correct answer: Use latex-free gloves and equipment throughout the entire procedure

Latex allergy requires a completely latex-free environment with latex-free gloves, catheters, and all equipment to prevent potentially life-threatening anaphylaxis.

Question 83: Why is systemic heparin anticoagulation routinely administered during left-sided EP procedures?

To prevent hematoma at the femoral access site
To prevent thromboembolism from catheter and sheath surfaces in the left heart (Correct answer)
To decrease ablation lesion size
To reduce post-procedure pulmonary embolism risk only

Correct answer: To prevent thromboembolism from catheter and sheath surfaces in the left heart

Heparin prevents thrombus formation on intracardiac catheters and sheaths within the left heart, reducing the risk of systemic thromboembolism and stroke.

Question 84: Syncope occurring during exercise in a young patient should raise concern for which underlying condition?

Hypertrophic cardiomyopathy (Correct answer)
Orthostatic hypotension
Vasovagal syncope
Carotid sinus hypersensitivity

Correct answer: Hypertrophic cardiomyopathy

Exercise-induced syncope in young patients is a red flag for obstructive or arrhythmic cardiac causes, with hypertrophic cardiomyopathy being a leading concern.

Question 85: Where should the primary dosimeter badge be worn by EP lab personnel?

Dosimetry is not required for EP staff
At waist level under the apron
On the wrist only
At collar level outside and above the lead apron (Correct answer)

Correct answer: At collar level outside and above the lead apron

The collar dosimeter above the lead apron measures unshielded head, neck, and eye dose, providing the most meaningful estimate of radiation exposure for EP staff.

Question 86: Which of the following is an example of situational reflex syncope?

Micturition syncope (Correct answer)
Syncope during sustained exercise
Syncope upon standing from a seated position
Syncope due to arrhythmia onset

Correct answer: Micturition syncope

Micturition syncope is a form of situational reflex syncope triggered by specific physiological acts such as urination, defecation, coughing, or swallowing.

Question 87: What is the main difference between a single-chamber and a dual-chamber pacemaker?

A single-chamber pacemaker requires a defibrillator, while a dual-chamber pacemaker does not.
A single-chamber pacemaker has one lead, typically placed in the right atrium or ventricle,<br> while a dual-chamber pacemaker has two leads, one in the atrium and one in the ventricle. (Correct answer)
A dual-chamber pacemaker is smaller than a single-chamber pacemaker.
A single-chamber pacemaker is used only in children, while a dual-chamber pacemaker is used in adults.

Correct answer: A single-chamber pacemaker has one lead, typically placed in the right atrium or ventricle,<br> while a dual-chamber pacemaker has two leads, one in the atrium and one in the ventricle.

The primary distinction between single-chamber and dual-chamber pacemakers lies in the number and placement of their leads. A single-chamber pacemaker uses one lead, typically placed in either the right atrium or the right ventricle, to pace that specific chamber. In contrast, a dual-chamber pacemaker utilizes two leads, one in the right atrium and one in the right ventricle, allowing for more physiological pacing that mimics the heart's natural conduction sequence.

Question 88: An EGM from a dual-chamber pacemaker shows an atrial paced (AP) event followed 110 ms later by a ventricular paced (VP) event. This AP-VP sequence is intermittent and significantly shorter than the programmed AV delay of 200 ms. This behavior is most characteristic of which device feature?

Rate smoothing
An adaptive AV delay algorithm
Ventricular Safety Pacing (VSP) (Correct answer)
Auto-adjusting sensitivity

Correct answer: Ventricular Safety Pacing (VSP)

Ventricular Safety Pacing (VSP) is a protective algorithm designed to prevent ventricular asystole that could result from inappropriate inhibition of ventricular pacing due to crosstalk (when the atrial pacing stimulus is sensed on the ventricular lead). If the device senses a non-physiologic event in the ventricle within a specific window (typically ~110 ms) following an atrial paced event, it will deliver a ventricular pace at that very short AV delay to ensure a ventricular contraction occurs. This EGM pattern is the classic signature of a VSP event.

Question 89: What is the primary purpose of electroanatomic mapping systems in catheter ablation?

To measure intracardiac blood pressure
To create 3D maps integrating anatomical and electrical activation data (Correct answer)
To monitor systemic oxygen saturation
To deliver internal defibrillation

Correct answer: To create 3D maps integrating anatomical and electrical activation data

Electroanatomic mapping systems create three-dimensional maps combining chamber anatomy and electrical activation to guide catheter positioning and ablation targeting.

Question 90: Which of the following rate-response sensors functions by delivering subthreshold electrical pulses and measuring the changes in electrical resistance across the chest cavity to estimate respiratory effort?

Minute Ventilation Sensor (Correct answer)
QT Interval Sensor
Peak Endocardial Acceleration (PEA)
Accelerometer

Correct answer: Minute Ventilation Sensor

A minute ventilation (MV) sensor measures changes in transthoracic impedance. As a patient breathes, the amount of air in the lungs changes, which alters the electrical impedance of the chest. The sensor delivers small electrical pulses and measures this changing impedance to estimate the patient's respiratory rate and tidal volume, which correlates with metabolic demand. An accelerometer is a motion sensor that detects physical activity. A QT interval sensor and PEA sensor measure cardiac-related parameters.

Question 91: Which of the following elements is NOT a mandatory component of the informed consent process for an electrophysiology procedure like a catheter ablation or device implant?

A description of the potential material risks and common complications.
A guarantee of a successful outcome without complications. (Correct answer)
A presentation of viable alternatives, including the option of no treatment.
A discussion of the nature of the procedure and its expected benefits.

Correct answer: A guarantee of a successful outcome without complications.

The informed consent process must provide a comprehensive overview of the procedure, including its purpose, benefits, significant risks, and available alternatives. However, it is unethical and impossible to guarantee a specific outcome or a complication-free procedure. The consent process is about ensuring the patient understands the potential benefits and risks so they can make an autonomous decision, not about promising a certain result.

Question 92: Grounding pad placement for RF ablation should specifically avoid?

Thigh or flank skin areas
Areas over bony prominences or near implanted devices (Correct answer)
Posterior trunk locations
Lateral chest wall placement

Correct answer: Areas over bony prominences or near implanted devices

Grounding pads placed over bony prominences have poor skin contact and concentration of current, while proximity to implanted devices risks device damage from redirected current.

Question 93: The 'safe zone' for femoral vascular access lies?

Within the femoral triangle near the knee
Medial to the femoral nerve only
Below the inguinal ligament where the common femoral vessels are accessible (Correct answer)
Above the inguinal ligament over the external iliac vessels

Correct answer: Below the inguinal ligament where the common femoral vessels are accessible

The common femoral artery and vein should be accessed below the inguinal ligament to avoid the external iliac vessels and reduce retroperitoneal hematoma risk.

Question 94: In pediatric patients with Wolff-Parkinson-White (WPW) syndrome, which type of arrhythmia is most commonly observed?

Atrial fibrillation
Atrioventricular reentrant tachycardia (AVRT) (Correct answer)
Sinus tachycardia
Ventricular fibrillation

Correct answer: Atrioventricular reentrant tachycardia (AVRT)

In pediatric patients with Wolff-Parkinson-White (WPW) syndrome, the most common arrhythmia observed is atrioventricular reentrant tachycardia (AVRT). This arrhythmia occurs due to a re-entry circuit involving the normal AV nodal pathway and the accessory pathway. The electrical impulse travels rapidly through this circuit, causing the heart to beat very fast.

Question 95: A patient with a history of myocardial infarction develops a stable monomorphic ventricular tachycardia. The underlying mechanism is most likely a re-entrant circuit that has formed around the infarct scar. Which electrophysiologic property of the scar border zone is critical for sustaining this arrhythmia?

Absence of anisotropic conduction
A zone of slow conduction (Correct answer)
Enhanced automaticity
A shortened effective refractory period

Correct answer: A zone of slow conduction

For a re-entrant circuit to be sustained, the wavelength of the impulse (conduction velocity x refractory period) must be shorter than the path length of the circuit. A zone of slow conduction, often found in the heterogeneous tissue at the border of an infarct scar, lengthens the transit time of the impulse around the circuit. This delay allows the tissue at the start of the circuit to recover from its refractory period before the wavefront returns, permitting the arrhythmia to continue.

Question 96: In analyzing a narrow complex tachycardia, which of the following findings would most strongly favor a diagnosis of typical atrioventricular nodal reentrant tachycardia (AVNRT) over orthodromic atrioventricular reentrant tachycardia (AVRT)?

The presence of QRS alternans.
A long RP interval where the P-wave is clearly visible in the ST segment.
A visible retrograde P-wave (pseudo r' in V1 or pseudo S in inferior leads) immediately following the QRS complex, resulting in a short RP interval. (Correct answer)
Initiation of the tachycardia by a premature ventricular contraction.

Correct answer: A visible retrograde P-wave (pseudo r' in V1 or pseudo S in inferior leads) immediately following the QRS complex, resulting in a short RP interval.

Typical (slow-fast) AVNRT involves near-simultaneous activation of the atria and ventricles. This results in the retrograde P-wave being buried within the QRS complex or appearing just at the end of it, creating a very short RP interval (often <70-90 ms). This can manifest as a 'pseudo r' wave' in V1 or a 'pseudo S wave' in the inferior leads. In contrast, orthodromic AVRT involves a larger reentry circuit, typically leading to a longer RP interval.

Question 97: What constitutes the endpoint of successful accessory pathway catheter ablation?

New right bundle branch block
Normalization of PR interval alone
Loss of pre-excitation on ECG and non-inducibility of AVRT (Correct answer)
Development of sinus tachycardia

Correct answer: Loss of pre-excitation on ECG and non-inducibility of AVRT

Successful accessory pathway ablation eliminates the delta wave (pre-excitation) on surface ECG and renders AVRT non-inducible during programmed stimulation.

Question 98: During a catheter ablation procedure for atrioventricular nodal reentrant tachycardia (AVNRT), the electrophysiologist must exercise extreme caution to avoid the atrioventricular (AV) node. Which anatomical landmark is critical for identifying the location of the AV node?

The Eustachian Ridge
The Triangle of Koch (Correct answer)
Bachmann's Bundle
The Ligament of Marshall

Correct answer: The Triangle of Koch

The Triangle of Koch is an anatomical region in the right atrium used to locate the atrioventricular (AV) node. Its borders are the ostium of the coronary sinus, the septal leaflet of the tricuspid valve, and the tendon of Todaro. The AV node is located at the apex of this triangle, making it a crucial landmark for avoiding iatrogenic AV block during ablation procedures targeting the slow pathway of AVNRT.

Question 99: A routine interrogation of a VVI pacemaker reveals intermittent pacing spikes that are not followed by a QRS complex. A threshold test is performed and shows the ventricular capture threshold is 3.5V @ 0.4ms. The device is currently programmed to an output of 2.5V @ 0.4ms. What is the most appropriate immediate programming change?

Decrease the lower rate limit by 10 ppm
Increase the ventricular output to 4.5V @ 0.4ms (Correct answer)
Change the pacing mode to VVO
Increase the ventricular sensitivity by lowering the mV value

Correct answer: Increase the ventricular output to 4.5V @ 0.4ms

The issue is loss of capture, where the programmed pacing output is insufficient to depolarize the myocardium. The threshold test confirms this, as the required energy (3.5V) is higher than the delivered energy (2.5V). The immediate solution is to increase the pacing output to a value that provides an adequate safety margin above the measured threshold. An output of 4.5V provides a 1.0V safety margin. Changing sensitivity, rate, or mode does not address the failure to capture.

Question 100: Which alpha-1 adrenergic agonist is used to treat neurally mediated syncope and orthostatic hypotension by increasing peripheral vascular resistance?

Fludrocortisone
Midodrine (Correct answer)
Pyridostigmine
Metoprolol

Correct answer: Midodrine

Midodrine is a selective alpha-1 agonist that raises peripheral vascular resistance and venous return, reducing syncope recurrence and has a Class IIa recommendation for vasovagal syncope.

Question 101: Which direct oral anticoagulant (DOAC) acts as a direct thrombin inhibitor rather than a factor Xa inhibitor?

Rivaroxaban
Dabigatran (Correct answer)
Apixaban
Edoxaban

Correct answer: Dabigatran

Dabigatran directly inhibits thrombin (factor IIa), whereas rivaroxaban, apixaban, and edoxaban are all factor Xa inhibitors.

Question 102: Which of the following ECG findings is the defining characteristic of a Mobitz Type II second-degree atrioventricular block?

A PR interval that is consistently greater than 200 ms.
A constant PR interval in all conducted beats before an unexpected, non-conducted P-wave. (Correct answer)
Complete dissociation between P-waves and QRS complexes.
Progressive prolongation of the PR interval until a QRS complex is dropped.

Correct answer: A constant PR interval in all conducted beats before an unexpected, non-conducted P-wave.

Mobitz Type II second-degree AV block is characterized by a constant and unchanging PR interval in the conducted beats preceding a suddenly dropped QRS complex (a non-conducted P-wave). Unlike Mobitz Type I (Wenckebach), there is no progressive lengthening of the PR interval. This type of block is typically located in the His-Purkinje system and carries a higher risk of progressing to complete heart block.

Question 103: A patient with a dual-chamber pacemaker programmed in DDD mode reports palpitations. The device interrogation reveals a tachycardia with a ventricular rate locked at the upper tracking rate. The intracardiac electrogram shows that each ventricular paced event is followed by a retrograde P-wave, which is then sensed by the atrial lead, triggering the next ventricular paced event. What is this rhythm called?

Pacemaker-mediated tachycardia (PMT) (Correct answer)
Sensor-indicated tachycardia
Mode Switch event
Ventricular safety pacing (VSP)

Correct answer: Pacemaker-mediated tachycardia (PMT)

Pacemaker-mediated tachycardia (PMT) is a re-entrant tachycardia in which the pacemaker acts as the antegrade limb (atrial sensing to ventricular pacing) and the patient's own AV node acts as the retrograde limb (ventricle to atrium conduction). This creates an endless loop where a ventricular paced event causes a retrograde P-wave, which is then tracked by the pacemaker, leading to another ventricular paced event, perpetuating the tachycardia at the upper tracking rate.

Question 104: The EGSYS (Evaluation of Guidelines in Syncope Study) score is primarily used to:

Assess functional severity of heart failure
Guide selection of antiarrhythmic drug therapy
Predict the probability of a cardiac (arrhythmic) cause of syncope (Correct answer)
Determine candidacy for cardiac resynchronization therapy

Correct answer: Predict the probability of a cardiac (arrhythmic) cause of syncope

The EGSYS score uses clinical variables (palpitations, ECG abnormalities, structural heart disease, absence of vagal triggers) to predict the likelihood of cardiac syncope and guide risk stratification.

Question 105: An implantable loop recorder (ILR) is most appropriately indicated for:

Patients with syncope and known sustained VT on prior Holter
Patients with daily syncope episodes on telemetry monitoring
Patients with typical vasovagal syncope and clear triggers
Patients with recurrent unexplained syncope after a complete initial evaluation (Correct answer)

Correct answer: Patients with recurrent unexplained syncope after a complete initial evaluation

ILR is indicated for unexplained recurrent syncope where standard non-invasive tests have been inconclusive, allowing long-term ECG monitoring during spontaneous episodes.

Question 106: Which antiarrhythmic drug requires regular monitoring of thyroid and pulmonary function due to its molecular structure?

Sotalol
Dronedarone
Flecainide
Amiodarone (Correct answer)

Correct answer: Amiodarone

Amiodarone contains two iodine atoms and can cause thyroid dysfunction and pulmonary toxicity requiring periodic thyroid function tests and chest imaging.

Question 107: What is the typical heart rate range associated with sinus tachycardia?

150-200 beats per minute
100-150 beats per minute (Correct answer)
60-100 beats per minute
40-60 beats per minute

Correct answer: 100-150 beats per minute

Sinus tachycardia is defined as a sinus rhythm with a heart rate greater than 100 beats per minute. While it can go higher, the typical range associated with common physiological responses to stress, exercise, or fever often falls within 100-150 bpm. This range helps distinguish it from more rapid supraventricular tachycardias or other pathological rhythms.

Question 108: The cardioinhibitory type of vasovagal syncope is primarily characterized by:

Tachycardia followed by sudden loss of consciousness
Hypotension with little or no bradycardia
Both equal bradycardia and hypotension
Significant bradycardia or asystole with minimal hypotension (Correct answer)

Correct answer: Significant bradycardia or asystole with minimal hypotension

Cardioinhibitory vasovagal syncope is defined by predominant bradycardia or asystole with relatively preserved blood pressure until near loss of consciousness.

Question 109: Which of the following arrhythmias is most commonly associated with an accessory pathway, such as in Wolff-Parkinson-White (WPW) syndrome?

Supraventricular tachycardia (SVT) (Correct answer)
Atrial flutter
Sinus bradycardia
Ventricular tachycardia

Correct answer: Supraventricular tachycardia (SVT)

Wolff-Parkinson-White (WPW) syndrome is characterized by an accessory pathway, an abnormal electrical connection between the atria and ventricles that bypasses the AV node. This pathway can create a re-entry circuit, leading to rapid heart rhythms originating above the ventricles, most commonly supraventricular tachycardia (SVT). The presence of this extra pathway facilitates the rapid conduction of impulses, causing the heart to beat much faster than normal.

Question 110: A patient's ECG shows a significantly prolonged P-wave duration, suggesting an interatrial conduction delay. Dysfunction of which anatomical structure is the most likely cause?

Bachmann's Bundle (Correct answer)
The Bundle of His
The Purkinje Fibers
The Atrioventricular Node

Correct answer: Bachmann's Bundle

Bachmann's bundle is the primary pathway for rapid electrical conduction from the right atrium to the left atrium. Damage or fibrosis to this bundle can delay the activation of the left atrium, resulting in a prolonged P-wave on the surface ECG, which is a hallmark of interatrial block.

Question 111: Verapamil's mechanism for treating AV nodal-dependent tachycardias is primarily?

L-type calcium channel blockade in the AV node (Correct answer)
IKr potassium channel blockade
Fast sodium channel blockade
Beta-adrenergic receptor blockade

Correct answer: L-type calcium channel blockade in the AV node

Verapamil blocks L-type calcium channels in the AV node, slowing conduction and prolonging the AV nodal refractory period to terminate or prevent reentrant tachycardias.

Question 112: What primary energy source is used in radiofrequency catheter ablation?

Radiofrequency alternating electrical current (Correct answer)
High-intensity ultrasound
Laser energy
Cryoenergy

Correct answer: Radiofrequency alternating electrical current

Radiofrequency ablation uses alternating electrical current at approximately 500 kHz that generates resistive heating to create coagulative necrosis.

Question 113: Which of the following is the most appropriate initial treatment for a hemodynamically unstable patient with ventricular tachycardia?

Synchronized cardioversion (Correct answer)
Atropine
Oral beta-blockers
Digoxin

Correct answer: Synchronized cardioversion

For a hemodynamically unstable patient with ventricular tachycardia (VT), synchronized cardioversion is the most appropriate initial treatment. This procedure delivers a controlled electrical shock synchronized with the patient's QRS complex, aiming to reset the heart's electrical activity and restore a stable rhythm. This rapid intervention is crucial to prevent further hemodynamic compromise and potential cardiac arrest.

Question 114: Vascular closure devices (VCDs) after EP procedures are primarily used to?

Achieve hemostasis with reduced manual compression time (Correct answer)
Prevent access site infection
Monitor post-procedure blood pressure
Prevent deep venous thrombosis

Correct answer: Achieve hemostasis with reduced manual compression time

Vascular closure devices seal the arterial or venous puncture site using collagen plugs, sutures, or clips, significantly reducing manual compression time and patient discomfort.

Question 115: Which part of the heart’s conduction system is responsible for delaying the electrical impulse to allow the ventricles to fill with blood before they contract?

Bundle of His
Purkinje fibers
SA node
AV node (Correct answer)

Correct answer: AV node

The atrioventricular (AV) node plays a critical role in the heart's conduction system by delaying the electrical impulse as it travels from the atria to the ventricles. This brief delay is essential because it allows the atria to fully contract and pump blood into the ventricles before the ventricles begin their own contraction. This ensures optimal ventricular filling and efficient cardiac output.

Question 116: Which of the following is the primary function of a pacemaker?

To perform electrophysiology studies
To defibrillate the heart during cardiac arrest
To monitor blood pressure continuously
To regulate slow heart rates by delivering electrical impulses to the heart (Correct answer)

Correct answer: To regulate slow heart rates by delivering electrical impulses to the heart

Pacemakers are medical devices specifically designed to treat bradycardia, a condition where the heart beats too slowly. They function by delivering precisely timed electrical impulses to the heart muscle, stimulating it to contract at an appropriate rate. This ensures adequate blood flow throughout the body, preventing symptoms associated with a slow heart rate.

Question 117: Which of the following is the most common type of sustained arrhythmia in clinical practice?

Ventricular tachycardia
Bradycardia
Atrial fibrillation (Correct answer)
Atrial flutter

Correct answer: Atrial fibrillation

Atrial fibrillation (AFib) is the most common sustained cardiac arrhythmia encountered in clinical practice, affecting millions worldwide. It is characterized by disorganized electrical activity in the atria, leading to an irregular and often rapid ventricular response. Its prevalence increases significantly with age and it is a major risk factor for stroke.

Question 118: Which beta-blocker has an ultra-short half-life of approximately 9 minutes, making it ideal for acute rate control?

Carvedilol
Esmolol (Correct answer)
Atenolol
Metoprolol

Correct answer: Esmolol

Esmolol has an ultra-short half-life of approximately 9 minutes due to rapid hydrolysis by red blood cell esterases.

Question 119: The risk of atrioesophageal fistula, a rare but potentially fatal complication, is most associated with?

Posterior left atrial ablation for atrial fibrillation (Correct answer)
AVNRT slow pathway ablation
Right-sided ablation procedures
Cavo-tricuspid isthmus ablation

Correct answer: Posterior left atrial ablation for atrial fibrillation

The esophagus lies directly behind the posterior left atrium, making it vulnerable to thermal injury during posterior wall ablation for atrial fibrillation.

Question 120: Which electrophysiological test is used to identify and map the origin of arrhythmias in the heart?

Holter monitoring
Stress test
Electrophysiology study (EPS) (Correct answer)
Echocardiogram

Correct answer: Electrophysiology study (EPS)

An electrophysiology study (EPS) is an invasive diagnostic procedure specifically designed to evaluate the heart's electrical activity and identify the source of arrhythmias. During an EPS, catheters with electrodes are threaded into the heart to record electrical signals and induce arrhythmias. This allows electrophysiologists to precisely map the abnormal pathways or areas of tissue causing the arrhythmia, guiding treatment decisions like ablation.

Question 121: Anisotropy in cardiac tissue refers to the property where conduction velocity is dependent on the direction of wavefront propagation relative to the myocardial fiber orientation. In healthy ventricular tissue, conduction velocity is typically:

Fastest in the direction transverse (perpendicular) to the fiber orientation.
Slowest at the epicardial surface compared to the endocardium.
Equal in all directions, demonstrating isotropic conduction.
Fastest in the direction longitudinal (parallel) to the fiber orientation. (Correct answer)

Correct answer: Fastest in the direction longitudinal (parallel) to the fiber orientation.

Anisotropy is the directional dependence of conduction velocity. Conduction is fastest along the longitudinal axis of cardiac muscle fibers due to the elongated shape of the myocytes and the preferential alignment of gap junctions at the intercalated discs. This facilitates rapid and coordinated ventricular activation.

Question 122: Cardiac tamponade during an EP procedure is recognized by which constellation of findings?

Isolated sinus tachycardia
Hypertension and bradycardia
ST-segment elevation in anterior leads
Hypotension, elevated venous pressure, and equalized diastolic pressures (Correct answer)

Correct answer: Hypotension, elevated venous pressure, and equalized diastolic pressures

Tamponade produces Beck's triad of hypotension, elevated jugular venous pressure, and muffled heart sounds, with equalization of diastolic pressures across cardiac chambers.

Question 123: Which of the following devices is used to treat both bradycardia and tachycardia?

Pacemaker
Implantable Cardioverter Defibrillator (ICD) (Correct answer)
External defibrillator
Cardiac monitor

Correct answer: Implantable Cardioverter Defibrillator (ICD)

An Implantable Cardioverter Defibrillator (ICD) is a sophisticated device capable of treating both abnormally slow (bradycardia) and dangerously fast (tachycardia) heart rhythms. It functions as a pacemaker for bradycardia and can deliver high-energy shocks (defibrillation) to correct life-threatening tachyarrhythmias like ventricular tachycardia or fibrillation. This dual capability makes it a crucial device for patients at risk of sudden cardiac arrest.

Question 124: What is the primary mechanism by which adenosine terminates paroxysmal SVT?

Activates A1 receptors causing transient AV block (Correct answer)
Activates beta-adrenergic receptors
Blocks IKr potassium channels
Blocks L-type calcium channels

Correct answer: Activates A1 receptors causing transient AV block

Adenosine activates A1 receptors on AV nodal cells, increasing potassium conductance and causing transient AV block that interrupts reentrant SVT.

Question 125: In the VASIS (Vasovagal Syncope International Study) classification, Type 2B vasovagal syncope is characterized by:

Mixed equal bradycardia and hypotension
Pure vasodepressor response
Cardioinhibitory response with asystole ≥3 seconds (Correct answer)
Cardioinhibitory response without asystole

Correct answer: Cardioinhibitory response with asystole ≥3 seconds

VASIS Type 2B is defined as a cardioinhibitory response with asystole of ≥3 seconds, which may favor pacemaker implantation in selected patients.

Question 126: In patients with heart failure, what is the primary purpose of Cardiac Resynchronization Therapy (CRT)?

To increase heart rate
To provide oxygen therapy
To synchronize the contractions of the left and right ventricles, improving cardiac output (Correct answer)
To monitor arrhythmias without intervention

Correct answer: To synchronize the contractions of the left and right ventricles, improving cardiac output

Cardiac Resynchronization Therapy (CRT) is specifically designed for patients with heart failure who exhibit dyssynchrony, meaning their left and right ventricles do not contract in a coordinated manner. By delivering precisely timed electrical impulses to both ventricles, CRT helps synchronize their contractions. This improved coordination enhances the heart's pumping efficiency, leading to increased cardiac output and better symptom management.

Question 127: A patient with a dual-chamber pacemaker presents with a rapid, regular paced rhythm at the device's programmed upper tracking rate. The intracardiac EGM confirms a repeating sequence of a ventricular paced event followed by a retrograde atrial sensed event, which then triggers the next ventricular paced event. Which dedicated device feature is designed to automatically terminate this rhythm?

PMT Intervention Algorithm (Correct answer)
Ventricular Sense Response
Mode Switching
Rate Smoothing

Correct answer: PMT Intervention Algorithm

This scenario describes a classic Pacemaker-Mediated Tachycardia (PMT), also known as an endless-loop tachycardia. Modern pacemakers have specific algorithms, often called 'PMT Intervention' or similar names, that automatically detect this pattern and terminate it. A common method is for the device to extend the post-ventricular atrial refractory period (PVARP) for one cycle, which makes the atrial channel blind to the retrograde P-wave, breaking the loop. Mode switching is for atrial tachyarrhythmias, and the other options do not specifically address the PMT mechanism.

Question 128: Stereotactic body radiotherapy (SBRT) for VT ablation is most appropriately considered when?

Conventional catheter ablation has failed or is not feasible (Correct answer)
Patient refuses catheter ablation as first-line
Patient has preserved ejection fraction only
As first-line therapy for all VT patients

Correct answer: Conventional catheter ablation has failed or is not feasible

Cardiac SBRT (noninvasive radioablation) is an emerging salvage option for patients who have failed or are not candidates for conventional catheter ablation.

Question 129: POTS is most commonly seen in which demographic group?

Middle-aged men between ages 40 and 60
Elderly men over age 65
Pre-pubertal children under age 10
Young women between ages 15 and 50 (Correct answer)

Correct answer: Young women between ages 15 and 50

POTS predominantly affects young women in the second through fourth decades of life, with a female-to-male ratio of approximately 5:1.

Question 130: Orthostatic hypotension is defined as a sustained reduction in systolic blood pressure of at least how many mmHg within 3 minutes of standing?

30 mmHg
10 mmHg
40 mmHg
20 mmHg (Correct answer)

Correct answer: 20 mmHg

Orthostatic hypotension requires a drop of ≥20 mmHg in systolic BP or ≥10 mmHg in diastolic BP within 3 minutes of standing.

Question 131: Neurogenic orthostatic hypotension is commonly associated with which of the following conditions?

Essential hypertension
Parkinson's disease (Correct answer)
Mitral valve prolapse
Hyperthyroidism

Correct answer: Parkinson's disease

Parkinson's disease and related synucleinopathies (e.g., multiple system atrophy) cause central and peripheral autonomic neurodegeneration, leading to neurogenic orthostatic hypotension.

IBHRE Cardiac Device Specialist Exam

The IBHRE Cardiac Device Specialist Exam assesses competency in cardiac anatomy, electrophysiology principles, arrhythmia interpretation, implantable device functionality, device troubleshooting and programming, clinical management, pharmacology, ablation techniques, and patient safety.

150

Questions

180 min

Time Limit

70%

To Pass

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Sources & references

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ibhre.org — Exam dates, registration deadline, registration, exam format, time limit, score validity, eligibility, passing score, renewal, retake policy · verified Oct 2026
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