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Europace Advance Access published online on April 20, 2007
Europace, doi:10.1093/europace/eum049
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© The European Society of Cardiology 2007. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

CASE REPORT

Intermittent fasciculoventricular pathway: ECG and electrophysiologic findings, clinical implications

Agustín Bortone*, Florence Leclercq, Robert Grolleau-Raoux and Jean-Luc Pasquié

CHU Montpellier, Service de Cardiologie A, Clinique de Maladies du Cœur et des Vaisseaux, Hôpital Arnaud de Villeneuve, Centre Hospitalo-Universitaire, 371, avenue du Doyen Gaston Giraud, 34295 Montpellier Cedex 5, France

Although fasciculoventricular (FV) pathways never participate into tachycardia circuits, they give rise to ventricular pre-excitation of variable magnitude which can be source of ECG misinterpretation when associated to other supraventricular rhythm disorders. We report an intermittent FV pathway coincidentally unmasked during an electrophysiologic study performed for a symptomatic supraventricular tachycardia (atrial tachycardia). The clinical context, ECG and EP findings, and therapeutic options are described. Fasciculoventricular pathways need no medical or ablative treatment, thus their positive and differential diagnosis must be clearly assessed.

Key Words: Ventricular pre-excitation, Mahaim fibres, Intermittent fasciculoventricular pathway, Atrial tachycardia

* Corresponding author: Tel: +33 467 33 62 17; Fax: +33 467 33 62 18. E-mail address: agubene{at}hotmail.com

Manuscript submitted 6 November 2006. Accepted after revision 3 March 2007.


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