# Successful cryoablation for typical atrial flutter in a toddler with sinus node dysfunction: the youngest case report

## TL;DR

A toddler with heart rhythm issues successfully underwent a less invasive procedure to treat atrial flutter, avoiding the need for a pacemaker.

## Contribution

This is the youngest reported case of successful cryoablation for typical atrial flutter in a child with sinus node dysfunction.

## Key findings

- Cryoablation successfully terminated atrial flutter in a 2.8-year-old with sinus node dysfunction.
- No recurrence was observed after more than 1.5 years of follow-up.
- The procedure avoided pacemaker implantation and offered a less invasive alternative.

## Abstract

We describe the youngest (2.8 years, 9 kg) successful cavotricuspid isthmus (CTI) cryoablation whose medical management was complicated with severe sinus node dysfunction and recurrent atrial flutter despite medical therapy (sotalol).

Two-catheter, zero fluoroscopy electrophysiology study was performed using EnSite PrecisionTM mapping system. Cavotricuspid isthmus proved to be ‘in’ circuit with entrainment. Point-by-point 2 min cryolesions resulted in termination of atrial flutter, and later bidirectional block (>120 ms) was confirmed. There was no recurrence post-ablation (>1.5-year follow-up).

Ablation offers a less invasive approach (vs. pacemaker implantation) to toddlers with tachyarrhythmia and coexisting conduction disease, limiting medical management option.