Appropriate size for umbilical artery catheters in preterm infants?

[Per Odelberg-Johnson]

Apropriate size for umbilical artery catheter in preterm baby less than 1000g? I normally use fr 3 or 3,5 for babys less than 750g and Fr5 for the rest unless cirkulationproblems occur in the legs. We have had lots of NEC among babies 750-1000g in this year and wonder if there is a correlation to this. What is your experience?

[Ruth]

I tend to use 3.5 for all my arterial lines. NEC can ben linked to arterial lines but I havnt seen any link or association with size