A young woman precipitously delivers a 34wk gestation neonate in your ED. The mother is physically doing well and you turn your attention to the neonate, whose HR is 105 but falling. You prepare for a possible neonatal intubation and alert the NICU. Peds is on the way and you begin your resuscitation of the now bradycardic neonate. Your attending, handling the airway, instructs you to place the umbilical vein catheter.
How does one achieve requested access??