Related Experiment Videos
Reserve albumin and bilirubin toxicity index in infant serum
Insights
Reserve albumin concentration, crucial for binding unconjugated bilirubin, decreases in sick infants. This increases the risk of bilirubin toxicity, especially in premature and critically ill newborns.
Area of Science:
- Biochemistry
- Neonatology
- Clinical Chemistry
Background:
- Unconjugated bilirubin can be toxic to newborns, particularly premature infants.
- Reserve albumin concentration is a key factor in determining the risk of bilirubin-induced neurotoxicity.
Purpose of the Study:
- To measure reserve albumin concentration and calculate a bilirubin toxicity index (I) in neonatal sera.
- To investigate the relationship between these measures and factors like gestational age, clinical condition, and serum bilirubin levels.
Main Methods:
- Reserve albumin concentration was determined using dialysis with 14C-monoacetyl diamino diphenyl sulfone (MADDS).
- A bilirubin toxicity index (I) was calculated based on bilirubin and reserve albumin levels, albumin binding affinity, and bilirubin solubility.
Main Results:
- Reserve albumin concentration and the bilirubin toxicity index (I) varied significantly with gestational age, clinical status (sick vs. well), and serum bilirubin levels.
- Lower reserve albumin and higher index I values were observed in premature and critically ill infants.
- Clinical factors like hyperbilirubinemia, hypoxia, acidosis, and sepsis were associated with decreased reserve albumin and increased index I.
Conclusions:
- Reserve albumin concentration and bilirubin toxicity index are sensitive to gestational age and clinical condition in neonates.
- Sick and premature infants have reduced reserve albumin, increasing their susceptibility to bilirubin encephalopathy.
- These findings highlight the importance of assessing reserve albumin in managing hyperbilirubinemia in high-risk infants.
Abstract:
Reserve albumin concentration (the concentration of albumin available for binding of unconjugated bilirubin) was determined in 95 sera from 76 subjects by dialysis with 14C-monoacetyl diamino diphenyl sulfone (MADDS). An index, I of bilirubin toxicity in the plasma was calculated for each subject, based on the bilirubin and reserve albumin concentrations, the affinity of bilirubin for serum albumin, and the pH-dependent solubility of bilirubin in the plasma. The values of reserve albumin and of I varied significantly with gestational age, clinical condition (whether sick or well), and serum bilirubin level. The value of reserve albumin was decreased and I was increased in association with clinical factors (e.g., hyperbilirubinemia, hypoxia, acidosis, or sepsis) recognized as increasing the risk for bilirubin encephalopathy. The lowest values of reserve albumin and the highest values of I were found in the least mature and sickest infants.