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Increased hypoxanthine concentrations in cerebrospinal fluid of infants with hydrocephalus
Insights
Elevated hypoxanthine levels in cerebrospinal fluid indicate brain hypoxia in preterm infants with hydrocephalus. Treatment success correlated with decreased hypoxanthine, suggesting it reflects ventriculomegaly severity.
Area of Science:
- Biochemistry
- Neonatalogy
- Neurology
Background:
- Hypoxanthine, a purine metabolism end product, typically rises in body fluids during severe hypoxia.
- Hydrocephalus in preterm infants is a significant concern, potentially linked to brain tissue metabolism.
Purpose of the Study:
- To investigate the association between hydrocephalus in preterm infants and anaerobic brain metabolism.
- To measure cerebrospinal fluid hypoxanthine levels in hydrocephalic preterm infants.
Main Methods:
- Measured hypoxanthine concentrations in the cerebrospinal fluid of preterm infants with various types of hydrocephalus.
- Compared hypoxanthine levels in hydrocephalic infants to normal infants.
- Monitored hypoxanthine levels before and after treatment for ventriculomegaly.
Main Results:
- Cerebrospinal fluid hypoxanthine was undetectable in normal infants.
- Hydrocephalic infants exhibited elevated hypoxanthine levels (mean = 14.3 mumol/L).
- Successful treatment of ventriculomegaly led to a significant decrease in hypoxanthine levels (P < 0.05).
- Hypoxanthine concentrations were similar in acute posthemorrhagic, late, and congenital hydrocephalus, suggesting hypoxia is secondary to ventriculomegaly.
Conclusions:
- Hydrocephalus in preterm infants is associated with elevated cerebrospinal fluid hypoxanthine, indicating anaerobic brain metabolism.
- Hypoxanthine levels serve as a potential biomarker for brain hypoxia in this population.
- Treatment of ventriculomegaly effectively reduces markers of anaerobic brain metabolism.
Abstract:
Hypoxanthine, the end product of purine metabolism, is usually very elevated in body fluids during severe hypoxia. We measured hypoxanthine in the cerebrospinal fluid of hydrocephalic preterm infants (12 with posthemorrhagic, one with congenital hydrocephalus) to determine whether hydrocephalus is associated with anaerobic metabolism of brain tissue. Cerebrospinal fluid hypoxanthine was undetectable in normal infants. In hydrocephalic infants, the concentration of hypoxanthine ranged from 7.5 mumol/L to 28 mumol (means = 14.3 mumol/L). The hypoxanthine concentrations fell from a mean of 12.8 mumol/L to a mean of 2.0 mumol/L (P less than 0.05) with successful treatment of the ventriculomegaly by lumbar puncture or by ventriculoperitoneal shunt. Patients with acute posthemorrhagic hydrocephalus had similar concentrations of hypoxanthine (means = 14.5 mumol/L) as patients with late or with congenital hydrocephalus (means = 13.8 mumol/L), indicating that brain hypoxia is probably a consequence of the ventriculomegaly and not of the hemorrhagic insult.