# Triple Loop Atrial Flutter Occurring After a Lung Transplant

## TL;DR

A rare triple loop atrial flutter was identified after a lung transplant, involving electrical connections between the recipient's heart and donor tissue.

## Contribution

The study identifies a novel mechanism of atrial flutter involving donor and recipient tissue connections post-lung transplant.

## Key findings

- Triple loop atrial flutter was mapped using high-density activation.
- Electrical connections between the recipient left atrium and donor pulmonary vein cuff contributed to the flutter.
- A surgical scar at the mitral isthmus acted as a substrate for the arrhythmia.

## Abstract

High‐density activation mapping with a multipolar catheter revealed a triple loop atrial flutter occurring after a lung transplant in which two electrical connections between the recipient left atrium and the donor left pulmonary vein cuff and a surgical scar at the mitral isthmus acted as a substrate.