Abstract :
The transseptal puncture is commonly performed during
cardiac interventions, although we have observed an increase
in the number of procedures using this access to the left heart
chambers (1). The clinical anatomy of the interatrial septum is
difficult, and its lack of familiarity can cause serious complications. The true interatrial septum represents only approximately
20% of the entire interatrial septum area. Only the floor of the
fossa ovalis and its immediate muscular inferior-anterior rim can
be resected without leaving the cavities of the heart (2, 3). The
relatively small area of approximately 140 mm2
can be punctured
without complication; however, this would necessitate the use
of catheter guidance techniques. The transseptal puncture is
mainly performed under fluoroscopic guidance, resulting in exposure to ionizing radiation
