Unintentional Mitral Lateral Isthmus Block During Pulmonary Vein Isolation With a Pentaspline Pulsed-Field Ablation Catheter

This case demonstrates an unintentional bidirectional mitral isthmus block created during pulmonary vein isolation using a pentaspline pulsed-field ablation catheter. The finding underscores the importance of careful sheath-catheter alignment at the left inferior pulmonary vein to prevent unintended lesion extension toward the mitral annulus.