Usefulness of an IKr blocker for ablation of non-pulmonary vein ectopies that are unmappable due to easily initiated atrial fibrillation

Nifekalant unmasked residual gap of superior vena cava isolation by suppressing immediate recurrence of intra‐superior vena cava fibrillation

“…However, it has also been shown to reduce the defibrillation threshold of AF and terminate AF 1,2 . Recently, Masuda et al reported that nifekalant could also facilitate the identification of extra‐PV foci by suppressing IRAF 3,4 . Using nifekalant, we aimed to suppress the immediate recurrence of intra‐SVC fibrillation to evaluate SVC gap conduction.…”

“… 1 , 2 Recently, Masuda et al reported that nifekalant could also facilitate the identification of extra‐PV foci by suppressing IRAF. 3 , 4 Using nifekalant, we aimed to suppress the immediate recurrence of intra‐SVC fibrillation to evaluate SVC gap conduction. Because the interatrial conduction time from the high right atrium to the distal coronary sinus was not prolonged after nifekalant infusion, the drug probably did not affect depolarization and the conduction velocity of the atrial muscle, confirming a previous report.…”