# Arrhythmias across the tree of life: comparative insights for human electrophysiology

## TL;DR

This paper explores how arrhythmias in animals like dogs, horses, and birds can provide new insights into human heart rhythm disorders and their treatment.

## Contribution

The paper introduces comparative insights from non-human animal arrhythmias to uncover novel mechanisms and therapeutic strategies for human electrophysiology.

## Key findings

- Horses experience atrial fibrillation without thromboembolic complications, suggesting protective pathways.
- Avian species adapt to cardiac loading conditions that would be pathological in mammals.
- Dogs show inherited arrhythmias with distinct phenotypes, offering insights into disease mechanisms.

## Abstract

Arrhythmias in non-human animals offer insights into human electrophysiology, yet physicians may be unaware of their occurrence and significance. This paper presents selected examples of arrhythmias in dogs, horses, and birds— as an invitation to human cardiologists to explore how animal models can illuminate mechanisms, genetics, and therapeutic approaches relevant to human electrophysiology.

Leading veterinary cardiologists compiled overviews of common arrhythmias in dogs, cats, horses and birds. Genetic predisposition, natural history, therapeutic approaches, and epidemiology were compared across these species and humans, highlighting translational opportunities.

Common human arrhythmias including atrial fibrillation, bradycardia, ventricular tachycardia, and arrhythmogenic right ventricular cardiomyopathy occur naturally in dogs, cats, horses, and birds. Cross-species differences in disease expression provide unique insights into mechanisms of arrhythmia vulnerability and resistance. Dogs develop similar inherited arrhythmogenic diseases but with distinct phenotypes. Horses experience atrial fibrillation without thromboembolic complications, revealing potential protective pathways. They also demonstrate extreme exercise-induced arrhythmia susceptibility, isolating exercise as an arrhythmogenic trigger. Avian species exhibit remarkable adaptation to cardiac loading conditions that would be pathological in mammals. These comparative observations across species highlight novel mechanisms underlying both susceptibility and resistance to arrhythmias and conduction disorders, offering unexplored therapeutic targets for human patients.

Cross-species knowledge offers direct translational value for human electrophysiology—from genetic markers in Labrador Retrievers with supraventricular tachycardia to cardiac loading paradigms in broiler chickens. Breaking down disciplinary barriers through shared research initiatives and integrated training represents an essential, underutilized strategy for advancing arrhythmia diagnosis, treatment, and prevention in human patients.