Transeptal puncture using the Daig SL1 System (AP view); A, Active fixation dual shock coil DF and pacing lead; B, Daig SL1 puncture kit; C, LV bipolar lead still in RA; D, CS lead (temporary); E, RVA temporary Electrode (for orientation); F, old RVA lead. RAO, right anterior oblique, DF, defibrillation, LV, left ventricle, CS, coronary sinus, RVA, right ventricular apex.