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Serum bile acids in newborns: evidence for an hepatic dysfunction in low-birth-weight infants
Insights
Newborns showed varying serum bile acid levels post-meal. Low-birth-weight infants had significantly higher levels, suggesting a specific bile acid metabolism dysfunction, not cholestasis.
Area of Science:
- Neonatal Physiology
- Gastroenterology
- Biochemistry
Background:
- Bile acids are crucial for digestion and absorption.
- Understanding bile acid metabolism in newborns is vital for identifying potential health issues.
- Previous studies have not fully elucidated post-prandial bile acid patterns in different newborn groups.
Purpose of the Study:
- To investigate the post-prandial pattern of total serum bile acids in newborns.
- To compare bile acid metabolism between premature, low-birth-weight, and normal term infants.
- To differentiate between cholestasis and specific metabolic dysfunction in low-birth-weight infants.
Main Methods:
- Studied 47 newborns (12 premature, 17 low-birth-weight, 18 term normal) at one month of age.
- Collected peripheral blood samples via microcatheter at fasting and post-test meal (40 ml/kg formula).
- Assayed serum bile acids using a sensitive enzymatic micromethod (0.3 pmol sensitivity).
Main Results:
- Serum bile acid response in normal newborns mimicked adult patterns.
- Premature infants showed slightly elevated bile acid levels, significant at 0 and 180 minutes.
- Low-birth-weight infants exhibited significantly higher serum bile acid levels throughout the test compared to other groups.
Conclusions:
- Low-birth-weight infants demonstrate a specific dysfunction in bile acid metabolism.
- Elevated serum bile acids in these infants are not indicative of cholestasis.
- Findings highlight the need for further investigation into neonatal bile acid regulation.
Abstract:
The post-prandial pattern of total serum bile acids was studied in 47 newborns: 12 prematures (less than 36 weeks), 17 term low-birth-weight infants (less than the 3rd percentile), 18 term normals. The study was made at the end of the first month. Blood was collected in a peripheral vein using a microcatheter. Samples were taken at fasting time and 30, 60, 120, 180 min after a test meal intake (40 ml/kg of "humanized" milk based formula). Bile acids were assayed using an original enzymatic micromethod which needed only 50 microliter of serum and showed a sensitivity of 0.3 pmol in 200 microliter of reaction medium. The response of serum bile acids after the test meal was very similar in normal term newborns and in adults. Prematures exhibited bile acid levels slightly higher than normals, but this difference was significant only at 0 and 180 min. Low-birth-weight infants showed very high values of serum bile acids at all times during the test, compared to normal and premature infants. Serum levels of total bilirubin and alkaline phosphatase were similar in all 3 groups. These results are not consistent with cholestasis but rather indicate a specific dysfunction in bile acid metabolism in low-birth-weight infants.