Funny Current Downregulation and Sinus Node Dysfunction Associated With Atrial Tachyarrhythmia

Abstract

AT downregulates SAN HCN2/4 and minK subunit expression, along with the corresponding currents I(f) and I(Ks). Tachycardia-induced remodeling of SAN ion channel expression, particularly for the "pacemaker" subunit I(f), may contribute to the clinically significant association between SAN dysfunction and supraventricular tachyarrhythmias.