Cardiac catheterization is carried out by constructing a left atrial model of a heart of a living subject, selecting a global catheter that is dimensioned to conform to the left atrial model, representing the catheter in the left atrial model； extending the length axis of the catheter in the left atrial model to form an intersection with the foramen ovale, and reporting the intersection as a recommended site of transseptal puncture for insertion of the catheter therethrough.
