Radiofrequency catheter ablation of a concealed accessory pathway of the heart in a Labrador Retriever

Abstract

The presence of an accessory atrioventricular conduction pathway may provide the anatomical basis for some tachyarrhythmias. Persistent tachyarrythmias may result in the development of systolic dysfunction or tachycardiomyopathy and eventual progression to heart failure. In this paper we report the successful ablation of an accessory pathway involved in the pathogenesis of persistent orthodromic atrioventricular reciprocating tachycardia (AVRT) and heart failure in a 3-year-old male Labrador retriever. Electrophysiological study and radiofrequency (RF) catheter ablation were performed under general anesthesia. Electrophysiological study revealed AVRT resulting from a retrograde conduction via a right posteroseptal accessory pathway. The successful RF ablation of the accessory pathway resulted in the resolution of the tachycardia and return of normal sinus rhythm. Medical management of heart failure was withdrawn and no episodes of recurrent tachyarrhythmia were documented during a 3-month follow-up.

Anaesthetic management for cardiac 3D electro‐anatomical mapping and radiofrequency catheter ablation in a horse with sustained atrial tachycardia

“…Traditionally, the intracardiac ablation catheters were guided into position under fluoroscopy. 7,[10][11][12] As procedures have become increasingly complex, and in an attempt to reduce radiation exposure, 3D EAM systems have been developed, which create visual 3D reconstructions of the cardiac chambers with their electrical activation pattern, without the need for fluoroscopy. 5,13 The mapping system tracks a catheter in the heart using impedance sensing or a magnetic sensor in combination with an external magnetic field generator to create a 3D image.…”

“…Traditionally, the intracardiac ablation catheters were guided into position under fluoroscopy 7,10–12 . As procedures have become increasingly complex, and in an attempt to reduce radiation exposure, 3D EAM systems have been developed that create visual 3D reconstructions of the cardiac chambers with their electrical activation pattern without the need for fluoroscopy 5,13 .…”

Screening for circulating miR-208a and -b in different cardiac arrhythmias of dogs

“…They are reported in a significant percentage of dogs with organic heart diseases such as mitral valve disease (MVD) and dilated cardiomyopathy (DCM) as well as in those with congenital heart defects. The development of tachycardiomiopathy in dogs with cardiac arrhythmias such as focal atrial tachycardia (FAT), atrioventricular reentrant tachycardia (AVRT), or atrial fibrillation has also been documented (9). Atrial fibrillation and ventricular premature complexes are among the most common arrhythmias in dogs (10).…”