Figure 1.

(A) Transseptal puncture; the transseptal sheath (Swartz SL0 sheath, St. Jude Medical, Saint Paul, MN, USA) is in the left atrium. The patient has previously undergone a TAVI (transcatheter aortic valve implantation) procedure, the frame of the prosthetic valve can be seen. (B) Dilation of the interatrial hole with the peripheral balloon (the distal part of the guidewire is in the left superior pulmonary vein). CS, coronary sinus decapolar catheter; ICE, intracardiac echocardiography catheter; RA, right atrial lead; RV shock, right ventricular shock lead; old RV pacemaker, previously implanted right ventricular pacemaker lead.