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

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The transient outward potassium current (Ito) is primarily responsible for which phase of the ventricular action potential?

Phase 0 depolarization Phase 1 early repolarization (the notch) Phase 2 plateau Phase 4 diastolic depolarization

Correct Answer:

Phase 1 early repolarization (the notch)

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