RESUMEN
A high flow arteriovenous shunts in newborns may require urgent endovascular treatment right immediately after delivery if high output cardiac failure is resistant to medical treatment. The umbilical approach is often the first choice of the access route for endovascular treatment in the newborn. It is, however, not infrequent that the patient has an extensive lesion, which necessitates a second session of treatment because of the limitation of the usable amount of the contrast material in one session. In such a case, re-puncturing the femoral artery is difficult and carries the risk of leg ischemia. On the other hand, leaving the umbilical sheath for the second procedure carries risks of infection, thrombosis, and vessel injury. Herein we introduce our umbilical vessel catheter (UVC) retro-exchange technique (U-RET) in which we replace the umbilical sheath to a 3.5Fr UVC at the end of the first endovascular procedure to preserve the umbilical artery access and prepare for the repeated use. We believe that this method minimizes the risks of infection and vessel injury.