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

Which ion current is primarily responsible for phase 0 depolarization of a ventricular myocyte action potential?

Slow inward calcium current (ICaL) Fast inward sodium current (INa) Rapidly activating delayed rectifier potassium current (IKr) Funny pacemaker current (If)

Correct Answer:

Fast inward sodium current (INa)

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