Table 1. Reasons for Not Accomplishing Trans-Septal Catheterization

2003 1992–2002 No. of procedures 1,764 3,756 No. of aborted procedures 16 (0.90%) 32 (0.85%) Reasons  Lack of localization of fossa ovalis 7 18  Resistant atrial septum 4 1  Needle puncture of right atrium 4 9  Needle puncture of aortic root 1 4