Orthodromic Atrioventricular Reentry Bradycardia and Tachycardia Caused by an Accessory Pathway in Horses.

ABSTRACT:

Background

Accessory pathways (APs) are muscular bundles directly connecting the atria and ventricles, bypassing the atrioventricular (AV) node-His-Purkinje system. Anterograde conduction along the AP results in ventricular preexcitation. A retrograde conducting AP allows ventriculo-atrial (VA) conduction, creating a reentry circuit that mediates orthodromic atrioventricular reentry tachycardia (OAVRT). This condition is well described in humans and small animals, but has not been reported previously in horses.

Objectives

Describe clinical and electrocardiographic findings of horses with retrograde AP conduction and reporte mapping and radiofrequency ablation results in one horse.

Animals

Six horses with retrograde AP conduction.

Methods

Records from six horses

SUBMITTER: Buschmann E 

PROVIDER: S-EPMC12268229 | biostudies-literature | 2025 Jul-Aug

REPOSITORIES: biostudies-literature