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Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
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Selenium concentration in cerebrospinal fluid samples from a paediatric population.

Mireia Tondo1, Juan Moreno, Mercedes Casado

  • 1Clinical Biochemistry Department, Hospital Sant Joan de Déu, Instituto de Salud Carlos III (MICIN), Barcelona, Spain.

Neurochemical Research
|May 12, 2010
PubMed
Summary

Cerebrospinal fluid selenium (Se) levels in children decrease with age but increase with protein and GPX activity. Plasma Se did not correlate with CSF Se.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Pediatric Medicine

Background:

  • Selenium (Se) is a vital trace element crucial for optimal brain function.
  • Understanding selenium's role in the central nervous system, particularly in pediatric populations, is essential for neurological health.
  • Cerebrospinal fluid (CSF) provides direct insight into the brain's biochemical environment.

Purpose of the Study:

  • To analyze cerebrospinal fluid (CSF) selenium (Se) concentrations in pediatric patients.
  • To investigate correlations between CSF Se levels and biochemical variables including age, CSF protein, and glutathione peroxidase (GPX) activity.
  • To compare CSF Se levels with plasma Se concentrations.

Main Methods:

  • Analysis of CSF selenium (Se) in 89 pediatric patients.
  • Statistical correlation analysis between CSF Se and age, CSF total protein, plasma Se, and GPX activity.
  • Comparison of median CSF Se values with plasma Se concentrations.

Main Results:

  • CSF Se concentrations exhibited a significant negative correlation with patient age (r = -0.476; p < 0.0001).
  • CSF Se showed significant positive correlations with CSF total protein concentrations (r = 0.446; p < 0.001) and GPX activity (r = 0.431; p = 0.001).
  • No significant association was found between plasma and CSF Se concentrations; median CSF Se was 32 times lower than plasma Se.

Conclusions:

  • CSF Se levels in pediatric patients are influenced by age and total CSF protein.
  • The correlation between CSF Se and GPX activity suggests Se quantification may reflect Se-dependent protein function.
  • CSF Se concentrations are independent of serum Se levels in this pediatric cohort.