Periprocedural guidance for ASD closure. (A) 3D-TOE zoomed volume for the IAS from the Rt. Atrial side and Lt atrial aspect showing the catheter (arrow) coming from the IVC and crossing the ASD. (B) 3D-TOE zoomed volume for the IAS from the Rt. Atrial side and Lt atrial aspect showing the Amplatzer device (*) covering the ASD without obstructing the IVC or the CS. CS, coronary sinus; IVC, inferior vena cava.