Cartographie électro-anatomique tridimensionnelle et ablation par radiofréquence comme nouveau traitement d'une arythmie provoquée par une voie accessoire chez un cheval

This case report describes the diagnosis and treatment of an atrioventricular accessory pathway (AP) in a horse by three-dimensional electro-anatomical mapping (3D EAM) and radiofrequency catheter ablation (RFCA). During routine check-up of the horse, intermittent ventricular pre-excitation was noticed on the electrocardiogram (ECG), characterized by a short PQ interval and abnormal QRS morphology. A right cranial location of the AP was suspected from the 12-lead ECG and vectorcardiography. After precise localization of the AP using 3D EAM, ablation was performed and AP conduction was eliminated. Immediately after recovery from anesthesia an occasional pre-excited complex was still observed, but a 24-hour ECG and an ECG during exercise 1 and 6 weeks after the procedure showed complete disappearance of pre-excitation. This case shows the feasibility of 3D EAM and RFCA to identify and treat an AP in horses