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Question 1/101/10
Anatomy and Physiology - Basic Anatomy
Anatomy and Physiology - Basic Anatomy
Anatomy and Physiology - Basic Anatomy
During catheter insertion for electrophysiological study, the catheter must traverse the foramen ovale to access the left atrium. Which anatomical structure forms the valve of this foramen?
Select the answer:Select the answer
1 correct answer
A.
Eustachian valve
B.
Thebesian valve
C.
Septum primum
D.
Septum secundum
E.
Valve of inferior vena cava
Explanation: The foramen ovale is a normal opening in the atrial septum that allows right-to-left shunting of blood during fetal life. The septum primum acts as a one-way valve, allowing blood to pass from the right atrium to the left atrium when right atrial pressure exceeds left atrial pressure. The septum secundum is a thicker muscular structure that forms most of the atrial septum. The Eustachian valve (valve of the inferior vena cava) is located at the junction of the inferior vena cava and right atrium. The Thebesian valve is found at the coronary sinus orifice. Understanding this anatomy is crucial for transseptal puncture techniques used in many EP procedures.
Right Answer: C
Quiz
Question 2/102/10
Anatomy and Physiology - Conduction System
Anatomy and Physiology - Conduction System
Anatomy and Physiology - Conduction System
During a routine EP study, the specialist positions a catheter at the SA node region to obtain sinus node recordings. Which statement accurately describes the anatomical location of the sinoatrial node?
Select the answer:Select the answer
1 correct answer
A.
The SA node is located in the center of the right atrium at the level of the fossa ovalis
B.
The SA node is located at the junction of the crista terminalis and superior vena cava
C.
The SA node is located within the coronary sinus ostium region
D.
The SA node is located in the left atrium near the left pulmonary veins
E.
The SA node is located in the anterior right atrium near the tricuspid annulus
Explanation: The sinoatrial node is located at the junction of the crista terminalis and the superior vena cava, typically at the lateral aspect of the junction between these two structures. The SA node is normally the dominant pacemaker of the heart due to its fastest intrinsic rate of spontaneous diastolic depolarization. There is considerable variation in SA node size, shape, and precise location between individuals. The SA node is supplied by the sinoatrial nodal artery, which typically originates from the right coronary artery in right-dominant systems or occasionally from the left circumflex in left-dominant systems. During SA node dysfunction and sinus node reentrant tachycardia, the SA nodal region can be mapped using multisite recording and used as a target for ablation therapy. Recognition of the anatomical relationship between the crista terminalis, superior vena cava, and surrounding structures aids in navigation during high right atrial mapping procedures.
Right Answer: B
Quiz
Question 3/103/10
Anatomy and Physiology - Action Potentials
Anatomy and Physiology - Action Potentials
Anatomy and Physiology - Action Potentials
During an electrophysiology teaching session, the instructor describes the cardiac action potential and its phases. A trainee asks which phase represents rapid ventricular depolarization. Which phase of the cardiac action potential is responsible for rapid depolarization in ventricular myocardium?
Select the answer:Select the answer
1 correct answer
A.
Phase 1, which represents potassium efflux
B.
Phase 0, which represents rapid sodium influx through fast sodium channels
C.
Phase 2, which represents the plateau phase
D.
Phase 3, which represents repolarization
E.
Phase 4, which represents diastolic depolarization
Explanation: Phase 0 of the ventricular action potential represents rapid depolarization resulting from the opening of fast sodium channels and rapid inward sodium current (INa). This phase generates the steep upstroke of the action potential and is responsible for the rapid depolarization that allows fast conduction in ventricular myocardium. The rate of phase 0 depolarization (dV/dt) is a determinant of conduction velocity, with faster phase 0 upstrokes enabling faster conduction. Diseases or drugs that impair phase 0 depolarization, such as sodium channel blockers or hyperkalemia, slow conduction velocity and can promote reentrant arrhythmias. The amplitude and duration of phase 0 are critical for understanding electrocardiographic QRS complex characteristics and explaining conduction disturbances.
Right Answer: B
Quiz
Question 4/104/10
Devices - Bradycardia Pacing
Devices - Bradycardia Pacing
Devices - Bradycardia Pacing
A patient with sick sinus syndrome requires pacemaker implantation. Which pacing mode is most appropriate for this patient, allowing normal AV synchrony and rate response?
Select the answer:Select the answer
1 correct answer
A.
VVI
B.
AAI with rate response
C.
DDD with rate response
D.
AOO
E.
VVT
Explanation: DDD pacing with rate response (DDDR) is ideal for sick sinus syndrome as it maintains AV synchrony through dual-chamber pacing (atrial and ventricular) and provides rate modulation to increase pacing rate with activity. This mode optimizes hemodynamics by maintaining the atrial contribution to ventricular filling. VVI modes lack atrial synchrony and increase risk of pacemaker syndrome. AAI modes are inappropriate if AV conduction is impaired. The rate-responsive feature detects activity and increases pacing rate accordingly, improving exercise capacity. DDD mode without rate response may not increase heart rate adequately with exertion in some patients.
Right Answer: C
Quiz
Question 5/105/10
Devices - Tachycardia Therapy (ICD)
Devices - Tachycardia Therapy (ICD)
Devices - Tachycardia Therapy (ICD)
An ICD patient presents with multiple appropriate ICD shocks for sustained ventricular tachycardia. Before programming antitachycardia pacing (ATP) therapy, what must be confirmed about the tachycardia?
Select the answer:Select the answer
1 correct answer
A.
Monomorphic morphology without hemodynamic compromise
B.
Rate above the programmed detection zone
C.
Electrical stability (consistent RR intervals)
D.
All of the above
E.
Hemodynamic tolerance is unnecessary for ATP
Explanation: Before programming antitachycardia pacing for ventricular tachycardia, several criteria should be met: monomorphic VT (polymorphic VT may degenerate with pacing), stable RR intervals (irregular rhythms are less suitable for ATP), and ideally hemodynamic tolerance (though ATP can be used for hemodynamically significant VT if closely spaced intervals allow). ATP has high success rates for monomorphic VT, particularly for slower VT rates, and can terminate arrhythmias before acceleration or hemodynamic deterioration. Polymorphic VT and ventricular fibrillation should not receive ATP as primary therapy due to risk of acceleration or degeneration. Understanding ATP indications and limitations guides programming strategies to reduce shock burden.
Right Answer: D
Quiz
Question 6/106/10
Devices - Cardiac Resynchronisation Therapy
Devices - Cardiac Resynchronisation Therapy
Devices - Cardiac Resynchronisation Therapy
A patient with ischemic cardiomyopathy (EF 25%), LBBB (QRS 140 ms), and NYHA class III heart failure is referred for CRT evaluation. Which CRT indication criterion is NOT met?
Select the answer:Select the answer
1 correct answer
A.
LVEF <35%
B.
QRS duration ≥120 ms with LBBB
C.
NYHA functional class ≥II
D.
EF <40% with QRS <120 ms
E.
No contraindications to biventricular pacing
Explanation: CRT indications require EF ≤35% (not <40%) and QRS ≥120 milliseconds with LBBB morphology, or EF ≤35% with non-LBBB QRS ≥150 milliseconds. The patient in this case meets all criteria: EF 25% (<35%), QRS 140 ms (≥120 ms) with LBBB, and NYHA III symptoms. Option D states "EF <40% with QRS <120 ms" which would NOT meet criteria because the QRS duration is too short for non-LBBB morphology. CRT improves symptoms, reduces hospitalizations, and improves survival in appropriate candidates. Echocardiography should assess for relative contraindications such as significant MR, aortic stenosis, or restrictive physiology.
Right Answer: D
Quiz
Question 7/107/10
Devices - Implantable Loop Recorder
Devices - Implantable Loop Recorder
Devices - Implantable Loop Recorder
A 72-year-old patient with unexplained syncope and normal EF has had extensive cardiac evaluation without diagnostic findings. An implantable loop recorder (ILR) is considered. What is the primary diagnostic value of ILR in this population?
Select the answer:Select the answer
1 correct answer
A.
Detection of asymptomatic arrhythmias for risk stratification
B.
Correlation of symptoms with heart rhythm during syncope
C.
Continuous heart rhythm monitoring for 3 years
D.
All of the above
E.
Treatment of detected arrhythmias
Explanation: Implantable loop recorders provide diagnostic value through continuous heart rhythm monitoring (typically 3-4 years depending on device), allowing correlation of symptoms with detected arrhythmias. In unexplained syncope, ILR can identify if syncope is due to bradycardia (asystole, severe bradycardia), tachycardia (SVT, VT), or is non-arrhythmic. ILR also detects asymptomatic atrial fibrillation, which has implications for stroke risk assessment and anticoagulation decisions. The device automatically triggers recording of symptomatic episodes when the patient activates it, and stores prolonged continuous data with configurable detection windows for arrhythmias. ILR is diagnostic only; it does not treat arrhythmias but guides subsequent therapy based on findings.
Right Answer: D
Quiz
Question 8/108/10
Devices - Complications
Devices - Complications
Devices - Complications
A pacemaker patient presents 2 weeks after implantation with acute onset fever, night sweats, and a new cardiac murmur. Blood cultures are obtained and empiric antibiotics are started. What is the most likely diagnosis?
Select the answer:Select the answer
1 correct answer
A.
Pocket hematoma
B.
Lead dislodgement
C.
Device pocket infection (pocket abscess)
D.
Lead-related endocarditis
E.
Acute heart failure
Explanation: This clinical presentation (fever, night sweats, new murmur, positive blood cultures) in the acute post-implantation period is highly suspicious for lead-related endocarditis. The device/lead creates a foreign body that can be seeded hematogenously during bacteremia, or infection can occur from implantation site contamination spreading via the lead to the heart. Diagnosis is confirmed by blood cultures and echocardiography (TEE is most sensitive, showing vegetations on leads). Treatment requires prolonged IV antibiotics and typically lead extraction due to high mortality with infected hardware left in situ. Pocket infection typically presents with local signs (redness, warmth, drainage) and is usually diagnosed before systemic spread. Early recognition and aggressive treatment of device-related endocarditis are critical for survival.
Right Answer: D
Quiz
Question 9/109/10
Clinical Assessment - Heart Failure
Clinical Assessment - Heart Failure
Clinical Assessment - Heart Failure
A 58-year-old man with ischaemic cardiomyopathy (LVEF 32%) presents with progressive dyspnoea. He is currently on lisinopril, bisoprolol, and spironolactone. His NT-proBNP is 850 pg/mL. Which medication class should be added next according to current guidelines?
Select the answer:Select the answer
1 correct answer
A.
Loop diuretic
B.
SGLT2 inhibitor
C.
Hydralazine-nitrate combination
D.
Ivabradine
E.
Digoxin
Explanation: SGLT2 inhibitors (dapagliflozin, empagliflozin) have demonstrated mortality and hospitalisation benefits in heart failure with reduced ejection fraction across all EF ranges and are now recommended early in the treatment algorithm. This patient has received foundational therapy (ACEi, beta-blocker, MRA) and requires the next step. While loop diuretics address symptoms, they don't modify disease progression. Hydralazine-nitrate is reserved for specific populations or intolerance to ACEi/ARB. Ivabradine requires resting heart rate >70 bpm for indication. Digoxin has limited role in modern HF management.
Right Answer: B
Quiz
Question 10/1010/10
Clinical Assessment - Arrhythmias
Clinical Assessment - Arrhythmias
Clinical Assessment - Arrhythmias
A 68-year-old man with hypertension and type 2 diabetes presents with palpitations and is found to have atrial fibrillation with rapid ventricular response (HR 145 bpm). He is haemodynamically stable. What is the most appropriate initial management?
Select the answer:Select the answer
1 correct answer
A.
Direct current cardioversion
B.
Intravenous amiodarone
C.
Oral rate-controlling drug (beta-blocker or calcium antagonist)
D.
Aspirin monotherapy
E.
Immediate anticoagulation then elective cardioversion
Explanation: A haemodynamically stable patient with new-onset AF requires rate control initially with beta-blockers or non-dihydropyridine calcium antagonists (verapamil, diltiazem). DC cardioversion is reserved for haemodynamic instability. IV amiodarone is typically used for haemodynamically unstable patients or rate control failure. Aspirin alone is insufficient anticoagulation given stroke risk. Anticoagulation should be initiated based on CHA2DS2-VASc score, but this patient's immediate need is rate control for symptom relief and haemodynamic stability.
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Quiz name:BHRS EP Exam - May 2025
Total number of questions:549
Number of questions for the test:50
Pass score:80%
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