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Investigation of accelerated metabolic function in small for gestational age infants
Insights
Small for gestational age (SGA) infants show higher D-glucaric acid and creatinine excretion, suggesting accelerated maturation. This metabolic difference may explain their mild hyperbilirubinemia.
Area of Science:
- Neonatal physiology
- Pediatric endocrinology
Background:
- Infants small for gestational age (SGA) typically exhibit mild transient hyperbilirubinemia.
- This condition may indicate accelerated maturation of certain infant functions.
Purpose of the Study:
- To investigate metabolic differences in SGA infants compared to appropriate for gestational age (AGA) and premature infants.
- To assess urinary excretion of D-glucaric acid and creatinine as potential indicators of maturation.
Main Methods:
- Collected 24-hour urine samples from 12 SGA, 12 AGA, and 12 premature infants on day 3 of life.
- Measured urinary D-glucaric acid and creatinine excretion.
- Determined hematocrit and bilirubin levels at 72 hours of age.
Main Results:
- SGA infants had the highest hematocrit and lowest bilirubin levels.
- Despite lower urine volume, SGA infants showed significantly higher D-glucaric acid and creatinine excretion.
- Premature infants had the largest urine volume but the lowest excretion rates.
Conclusions:
- Increased D-glucaric acid and creatinine excretion in SGA infants suggests distinct metabolic pathways.
- These findings may contribute to understanding the mild hyperbilirubinemia observed in SGA infants.
- Further research is needed to confirm these metabolic differences and their clinical implications.
Abstract:
Small for gestational age (SGA) infants are known to develop relatively mild transient hyperbilirubinaemia, especially in comparison with premature infants. This may be interpreted as an index of accelerated maturation of particular vital functions. In the present study 12 SGA infants, 12 appropriate for gestational age (AGA) infants, and 12 premature infants had 24 h urine collections under standardized conditions on the third day of life. Urinary excretion of D-glucaric acid and creatinine, which can be increased by drugs (e.g. phenobarbital), were estimated. Haematocrit and bilirubin were determined at the age of 72h. In the 3 groups, the SGA infants had the highest mean haematocrit (SGA = 0.58, AGA = 0.5, Prem = 0.561/1) and the lowest mean bilirubin (SGA = 6.3, AGA = 8.6, Prem = 11.1 mg/dl). Despite a comparatively small urine volume (SGA = 19.6, AGA = 28.3, Prem = 37.3 ml/kg), excretion of D-glucaric acid (SGA = 0.18, AGA = 0.11, Prem = 0.06 mumol/kg) and creatinine (SGA = 101.6, AGA = 79.6, Prem = 80.2 mumol/kg) was significantly higher in the SGA infants. While the results do not provide conclusive evidence, the increased excretion of glucaric acid and creatinine associated with mild transient hyperbilirubinaemia can be considered an indicator of metabolic differences in SGA infants.