# Use of High-density Mapping to Ablate a Wide Accessory Pathway and Mahaim Fiber in a Patient with Ebstein’s Anomaly

## TL;DR

This paper describes using high-density mapping to successfully perform catheter ablation in a pediatric patient with Ebstein’s anomaly.

## Contribution

The study is the first to demonstrate the utility of high-density mapping in ablation for Ebstein’s anomaly.

## Key findings

- High-density mapping provided detailed anatomical and electrical insights in Ebstein’s anomaly.
- The technique improved the success of catheter ablation in a challenging case.
- It may reduce recurrence rates in similar patients.

## Abstract

Ablation of accessory pathways in patients with Ebstein’s anomaly can be challenging. Despite increasing experience and advances in mapping technology, success is limited and recurrence rates can be high. To date, high-density electroanatomic mapping has not been studied in this anatomical substrate. We present a pediatric case of Ebstein’s anomaly in which high-density mapping in Ebstein’s anomaly was a useful additional tool to improve the outcome of catheter ablation.