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Effects of albumin on ionized calcium in vitro
A Mimouni1, F Mimouni, C Mimouni
1University of Cincinnati, Children's Hospital Medical Center, Department of Pediatrics, Ohio.
Insights
Adding human serum albumin to neonatal serum significantly decreases ionized calcium (iCa) levels. This effect is more pronounced with higher albumin concentrations or lower baseline calcium, suggesting potential risks during rapid infusion in neonates.
Area of Science:
- Biochemistry
- Neonatal Medicine
- Clinical Chemistry
Background:
- Human serum albumin (HSA) is a critical therapeutic agent in neonatal care, often used for hypoproteinemia and as a volume expander.
- Maintaining stable serum calcium levels is vital for neonates, as imbalances can lead to serious complications.
Purpose of the Study:
- To investigate the in vitro effect of adding human serum albumin to neonatal serum on serum ionized calcium (iCa) concentration.
- To determine the relationship between albumin concentration, baseline calcium levels, and the change in iCa.
Main Methods:
- Human placental and cord serum samples (n=12) were analyzed.
- Concentrated human serum albumin was added incrementally to achieve concentrations ranging from 0 to 20.0 g/L.
- Serum iCa levels were measured at each concentration increment.
Main Results:
- A significant decrease in serum iCa concentration was observed with the addition of human serum albumin.
- Multiple regression analysis indicated that the decrease in iCa was more pronounced at higher baseline albumin concentrations and lower baseline calcium levels.
- The study demonstrated a dose-dependent inverse relationship between HSA concentration and iCa.
Conclusions:
- In vitro findings suggest that rapid infusion of human serum albumin in neonates may lead to a significant acute reduction in serum ionized calcium.
- Clinical monitoring of iCa is crucial during HSA administration in neonatal patients, especially those with pre-existing low calcium or high albumin levels.
- Further in vivo studies are warranted to confirm these findings and establish safe infusion protocols.
Abstract:
Human serum albumin is used to treat hypoproteinemia in neonates or used as a volume expander. We tested the hypothesis that the addition of human serum albumin to neonatal serum decreases the serum ionized calcium (iCa) concentration. Concentrated human serum albumin was added to 12 placental and cord serum samples to reach seven incremental concentrations from 0 to 20.0 g/L. Serum iCa concentration decreased significantly with the addition of serum albumin. From multiple regression analysis, the effect of albumin addition on serum iCa concentration had more marked effects at high baseline albumin or low baseline Ca concentrations. From this in vitro study, we speculate that fast infusion of albumin in human neonates has the potential for acutely lowering serum iCa concentration.