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

In a sinoatrial node cell, which current is the 'funny current' (If) responsible for pacemaker automaticity?

Voltage-gated sodium current (INa) HCN channel-mediated mixed Na+/K+ inward current activated by hyperpolarization L-type calcium current (ICaL) Na+/K+ ATPase pump current

Correct Answer:

HCN channel-mediated mixed Na+/K+ inward current activated by hyperpolarization

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