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Electrophysiological study and catheter ablation of a Mahaim fibre located at the mitral annulus–aorta junction

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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.

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Correspondence to R. Cappato.

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Francia, P., Pittalis, M.C., Ali, H. et al. Electrophysiological study and catheter ablation of a Mahaim fibre located at the mitral annulus–aorta junction. J Interv Card Electrophysiol 23, 153–157 (2008).

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  • Mahaim
  • Accessory pathway
  • Decremental conduction
  • Catheter ablation
  • Mitral annulus–aorta junction