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

## TL;DR

A case shows that using a specific ablation catheter can unintentionally block the mitral isthmus during heart procedures.

## Contribution

Highlights a new clinical observation about unintended lesion extension during pulmonary vein isolation with a pentaspline pulsed-field ablation catheter.

## Key findings

- Unintentional bidirectional mitral isthmus block occurred during pulmonary vein isolation.
- Careful sheath–catheter alignment is crucial to avoid unintended lesions near the mitral annulus.

## Abstract

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.