Europace Advance Access originally published online on April 20, 2007
Europace 2007 9(8):702-705; doi:10.1093/europace/eum049
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CLINICAL ELECTROPHYSIOLOGY
Intermittent fasciculoventricular pathway: ECG and electrophysiologic findings, clinical implications
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.