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Urinary hypoxanthine, xanthine and uric acid excretion in newborn infants with perinatal complications
Insights
Elevated urinary hypoxanthine levels in newborns may indicate perinatal complications and hypoxia. This finding helps retrospectively quantify oxygen deprivation in infants.
Area of Science:
- Biochemistry
- Neonatology
- Perinatal Medicine
Background:
- Perinatal complications can affect newborn metabolism.
- Urinary oxypurine excretion patterns may serve as biomarkers.
Purpose of the Study:
- To investigate urinary hypoxanthine, xanthine, and uric acid levels in newborns.
- To correlate these levels with perinatal complications and hypoxia.
Main Methods:
- Densitometric thin-layer chromatography was used to measure urinary oxypurines.
- Urine samples were collected from 105 newborn infants over 24 hours.
- Infants were categorized based on the presence and severity of perinatal complications.
Main Results:
- Elevated urinary hypoxanthine excretion was observed in 58% of infants with perinatal complications, compared to 7% without.
- Urinary xanthine levels were not significantly increased.
- Uric acid levels were slightly higher in infants with perinatal complications.
Conclusions:
- Increased urinary hypoxanthine excretion is a potential indicator of perinatal complications and hypoxic events in newborns.
- Specific thresholds (hypoxanthine >15% of total oxypurines or >0.075 mumol/mumol creatinine) may signify critical oxygen deprivation.
- Urinary hypoxanthine can be a valuable retrospective marker for quantifying hypoxia in neonates.
Abstract:
The concentration of hypoxanthine, xanthine and uric acid in the first 24-h urine of 105 newborn infants was measured densitometrically by thin-layer chromatography. 45 of them had moderate or severe perinatal complications. Among these newborns, 26 infants with perinatal complications (58%) and 4 infants without perinatal complications (7%) had an elevated urinary excretion rate of hypoxanthine. Urinary xanthine was not increased, uric acid was slightly higher in the group of infants with perinatal complication. It seems that a crucial mark is involved, if the rate of hypoxanthine exceed 15% of the total urinary oxypurine excretion, or, if related to urinary creatinine, more than 0.075 mumol hypoxanthine/mumol creatinine. Apparently, with hypoxic newborns increased values of urinary hypoxanthine excretion can be used to quantify the lack of oxygen retrospectively.