1. Interventional system for cardiovascular interventions, comprising a catheter ( 20 ) with an electrode ( 21 ); an electrographic device ( 40 ) that is coupled to the electrode ( 21 ) of the catheter ( 20 ) for measuring electrophysiological potentials; an imaging device ( 10 ) for generating images of the interventional region; a data processing unit ( 50 ) that is coupled to the imaging device ( 10 ) and the electrographic device ( 40 ) and that is adapted to perform the following steps: a) storing a sequence of images (I 1 ,. .. I k ,. .. ) of the catheter ( 20 ) in the interventional region together with associated electrographic recordings (E 1 ,. .. E k ,. .. ); b) receiving an actual image (I) of the catheter ( 20 ) in the interventional region; c) selecting a reference image (I k ) from the stored sequence of images (I 1 ,. .. I k ,. .. ) that belongs to a desired electrographic pattern (E k ); d) locating the position (T) of the catheter ( 20 ) on the reference image (I k ) and determining the corresponding target position (T′) on the actual image (I).