Accessory pathways are commonly found in certain locations around the Mitral and Tricuspid Valves.

The three most common location is in a Left Lateral location (60%) around the mitral valve, then in a Posterior-Septal location between the valves (25%) and finally around the free wall of the Tricuspid Valve.

The accessory pathways located the vicinity of the AV node (anterior/ mid septal locations) are hardest to treat with catheter ablation as they can be quite close to the
normal AV Node.

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