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CSF glucose levels in febrile infants
T Lerman-Sagie1, M Shohat, M Nitzan
1Department of Paediatrics A, Beilinson Medical Center, Petah Tiqva, Israel.
Insights
The cerebrospinal fluid (CSF)-to-blood glucose ratio in febrile infants significantly decreases in the first 8 weeks of life. This age-related change is crucial for accurately diagnosing meningitis in newborns.
Area of Science:
- Pediatrics
- Neurology
- Clinical Chemistry
Background:
- Accurate assessment of cerebrospinal fluid (CSF) glucose levels is vital for diagnosing central nervous system infections in infants.
- The relationship between blood glucose and CSF glucose in neonates and young infants is not fully understood.
- Fever and febrile convulsions are common in early infancy, necessitating reliable diagnostic markers.
Purpose of the Study:
- To investigate the changes in simultaneous blood and CSF glucose levels in febrile children during the first 8 weeks of life.
- To determine the normal CSF-to-blood glucose ratio in infants during the neonatal period and early infancy.
- To highlight the clinical significance of age-related glucose ratio variations in diagnosing infant meningitis.
Main Methods:
- Simultaneous blood and CSF glucose levels were measured in 143 febrile children without cerebromeningeal illness.
- Participants were evaluated for fever in the first 2 months of life or due to febrile convulsions.
- Statistical analysis was performed to compare glucose ratios and levels across different age groups.
Main Results:
- A significant decrease (P < 0.001) in the mean CSF-to-blood glucose ratio was observed from 0.67 in the first 2 weeks to approximately 0.57 by 8 weeks of age.
- Mean CSF and blood glucose levels did not show significant changes during the first 8 weeks.
- After 2 months of age, the mean CSF-to-blood glucose ratio significantly increased (P < 0.01) to 0.72, a typical normal value.
Conclusions:
- Significant age-related changes occur in the CSF-to-blood glucose ratio during the first weeks of life.
- These dynamic changes in glucose ratios are critical considerations when evaluating infants for potential meningitis.
- Establishing age-specific reference ranges for CSF glucose is essential for accurate diagnosis in neonates and young infants.
Abstract:
Simultaneous blood and CSF glucose levels were investigated in 143 febrile children without cerebromeningeal illness, who were evaluated due to fever in the first 2 months of life or febrile convulsions. There was a significant decrease (P less than 0.001) in the mean CSF-blood glucose ratio from 0.67 +/- 0.13 in the first 2 weeks of life to 0.56 +/- 0.11, 0.57 +/- 0.8 and 0.58 +/- 0.11 at the ages 2-4, 5-6 and 6-8 weeks, respectively. The mean CSF and blood glucose levels did not change significantly in this period. After the 2nd month of life there was a significant rise P less than 0.01 in the mean CSF-blood glucose ratio to 0.72 +/- 0.11, the customary normal value in children. This was associated with a significant rise in CSF glucose levels as compared to the first 8 weeks as a whole. Our study suggests age-related changes in CSF blood-glucose ratios during the first weeks of life which are important when evaluating infants for the possibility of meningitis.