Prophylactic antibiotics in neonates with umbilical artery catheter placement: a prospective study of 137 patients. Low positioning of umbilical-artery catheters increases associated complications in newborn infants.
To analyze the risk of cannula sepsis from indwelling umbilical arterial catheters and the indication for prophylactic antibiotics, 137 catheterized neonates with respiratory distress were prospectively placed into either antibiotic-treated (penicillin 50,000U/kg/day and kanamycin 15 mg./kg./day) or non-treated groups. Although bacteria were frequently isolated from blood and catheter tip cultures obtained upon removal of the catheter, especially among non-antibiotic treated infants, these isolates were predominantly non-pathogens and probably skin flora. Corresponding peripheral blood cultures were usually sterile. No cases of cannula-associated sepsis occurred among treated and non-treated newborns. The risk of bacteriologically proven sepsis resulting from an indwelling umbilical artery catheter appears insufficient to justify prophylactic antibiotics. We performed a randomized prospective study of the effect of placement position of umbilical-artery catheters on complication rates in high-risk newborn infants. A higher complication rate (31 of 40 vs. 13 of 33) (P less than 0.005) occurred in the group with the catheter tip at the third to fourth lumbar segment, as compared to those with the tip at the seventh to eighth thoracic segment, owing to more episodes of blanching and cyanosis of the extremities. There was no difference between groups in the rate of complications requiring catheter removal. Aortography revealed thrombosis in 21 of 23 patients studied, but there was no clinical evidence of impaired circulation. In retrospect, we found that, independently of catheter position, administration of antibiotics through the catheter was associated with an increased rate of complications (63 vs. 20 per cent). Umbilical-artery catheterization entails potential risks regardless of the position of the catheter; placement of the catheter with its tip at the seventh to eighth thoracic segment may be associated with fewer complications than at lower positions.
There is insufficient evidence from randomised trials to support or refute the use of prophylactic antibiotics when umbilical artery catheters are inserted in newborn infants, and no evidence to support or refute continuing antibiotics once initial cultures rule out infection in newborn infants with umbilical artery catheters.