Successful radiofrequency ablation of a slow atrioventricular nodal pathway on the left posterior atrial septum

RF catheter ablation is highly effective in eliminating atrioventricular no dal reentrant tachycardia by targeting the slow pathway in the posteroinfer ior part of Koch's triangle in the right atrium. We report here a patient i n whom "slow-fast" atrioventricular nodal reentrant tachycardia was elimina ted only by ablation of the slow path way in the left atrial posteroseptal region at the level of the mitral annulus after unsuccessful attempts at th e traditional site on the right side.