Question 1
Which ion current is primarily responsible for phase 0 depolarization of a ventricular myocyte action potential?
Correct Answer:
Fast inward sodium current (INa)
Question 2
The transient outward potassium current (Ito) is primarily responsible for which phase of the ventricular action potential?
Correct Answer:
Phase 1 early repolarization (the notch)
Question 3
Which currents jointly maintain the phase 2 plateau of the ventricular action potential?
Correct Answer:
ICaL inward and delayed rectifier potassium currents (IKs/IKr) outward
Question 4
In a sinoatrial node cell, which current is the 'funny current' (If) responsible for pacemaker automaticity?
Correct Answer:
HCN channel-mediated mixed Na+/K+ inward current activated by hyperpolarization
Question 5
According to the Vaughan Williams classification, which class consists of sodium channel blockers subclassified A, B, and C based on kinetics and effect on action potential duration?
Correct Answer:
Class I
Question 1
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About this Exam

Prepare with the ABIM Clinical EP Practice Questions - ABIM Clinical Cardiac Electrophysiology Subspecialty Certification Exam practice quiz. This question bank includes 100 questions covering ablation, current, patient, ventricular, and class. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ABIM Clinical EP Practice Questions - ABIM Clinical Cardiac Electrophysiology Subspecialty Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on ablation, current, patient, ventricular, and class. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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