Abstract:
OBJECTIVE:In the process of sampling blood through an umbilical arterial catheter (UAC), infant blood comes into stagnant contact with infusion solution in the "waste syringe" before being reinfused. We have previously demonstrated in vitro that this process is associated with less hemolysis of red blood cells (RBCs) with use of an isotonic solution compared with a hypotonic 0.25 normal saline (NS) solution. The objective of this study was to compare the in vivo effect on hemolysis of 2 UAC infusion/flush regimens (an isotonic regimen vs a hypotonic regimen) and to assess the early nutritional benefit of an amino acid solution as the isotonic UAC infusion solution. METHODS:Infants who had a birth weight of < or =1.5 kg and were expected to have a UAC for > or =3 days were enrolled within 24 hours of life into this prospective, double-blind, randomized, clinical trial of 2 UAC infusion solution/flush regimens. Power analysis demonstrated that 40 infants were needed to determine differences in hemolysis quantified by plasma-free hemoglobin (PFH) level. Nutrition from glucose was evaluated by measurement of daily dextrose calories. C-peptide was measured to evaluate endogenous insulin production. Adverse events and protein tolerance were tracked. RESULTS:Twenty-two infants (mean gestational age: 27 weeks; 945 g birth weight) were enrolled in each group, for an average of 4.2 days (range: 2.5-8 days). There were no group differences in demographics. PFH levels were lower for infants who received isotonic amino acid (IAA) in comparison with 0.25 NS (33 +/- 14 mg/dL vs 62 +/- 27 mg/dL, respectively). C-peptide was higher in those who received IAA, as were nonprotein calories received on days 4 to 6 of the study (51 +/- 11 kcal/kg/day vs 44 +/- 12 kcal/kg/day, IAA vs 0.25 NS, respectively). CONCLUSIONS:Lower PFH levels in IAA versus 0.25 NS group were consistent with our hypothesis of decreased hemolysis with an isotonic infusion/flush regimen. IAA use may also allow greater early glucose nutrition, as indicated by the higher level of endogenous insulin production and improved glucose tolerance. IAA seems to be a superior UAC solution to 0.25 NS in that it is associated with less hemolysis and improved nutrition.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Jackson JK,Biondo DJ,Jones JM,Moor PJ,Simon SD,Hall RT,Kilbride HWdoi
10.1542/peds.114.2.377subject
Has Abstractpub_date
2004-08-01 00:00:00pages
377-83issue
2eissn
0031-4005issn
1098-4275pii
114/2/377journal_volume
114pub_type
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