Rubin et al described a technique for determining the length of catheter to insert into the umbilical artery of a neonate. The authors are from Queen's University in Kingston, Ontario, Canada.


Patient population: Caucasian from 27 to 40 weeks of gestation


Goal: insertion of the catheter tip to between T6 and T10



(1) length from the xiphoid process to the pubis in cm

(2) length from the pubis to the mid-umbilicus (at the abdominal wall) in cm

(3) length of the umbilical stump in cm


length of the catheter in cm =

= (distance from xiphoid to pubis) + (distance from xiphoid to mid-umbilicus) + (length of the umbilical stump)


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