title: Electrophysiological study and catheter ablation of a Mahaim fibre located at the mitral annulus-aorta junction.
abstract: Accessory pathways with slow and anterograde decremental conduction (Mahaim fibres) are responsible for a minority of atrioventricular reentrant tachycardias. While usually located along the tricuspid annulus, left-sided Mahaim fibres have been occasionally reported. We here report on a unique case of radiofrequency catheter ablation of a Mahaim pathway located at the supero-septal aspect of the mitral annulus, in a region known as mitral annulus-aorta junction, between the right and left fibrous trigons. Electrophysiological properties and embryological implications of this unusual accessory pathway are discussed.
authors.affiliation: Arrhythmia and Electrophysiology Centre, I.R.C.C.S. Policlinico San Donato, University of Milan, Via Rodolfo Morandi, 30, 20097, San Donato Milanese, Milan, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Francia
authors.forename: M C
authors.initials: MC
authors.lastname: Pittalis
authors.forename: H
authors.initials: H
authors.lastname: Ali
authors.forename: R
authors.initials: R
authors.lastname: Cappato
mesh_terms: D001013:Aorta, Thoracic / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D002304:Cardiac Pacing, Artificial; D017115:Catheter Ablation; D017023:Coronary Angiography; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D011227:Pre-Excitation, Mahaim-Type / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*