Clinical trial NCT00389454: Acetaminophen Concentration in Cerebrospinal Fluid in Infants
Official title: Acetaminophen Concentration in Cerebrospinal Fluid in Infants
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Fever
Keywords: Acetaminophen
Fever
cerebro spinal fluid
Infants
Lead sponsor: Assaf-Harofeh Medical Center
Sponsor class: OTHER_GOV
First posted: 2006-10-18
Sex: ALL
Minimum age (years): 1
Maximum age (years): 2
Standard ages: CHILD
Accepts healthy volunteers: no
Time perspective: PROSPECTIVE

Brief summary: Acetaminophen is the most commonly used drug in children. Inhibition of COX-3 in the brain has been suggested as the primary central mechanism by which acetaminophen decrease pain and possibly fever. However there is very limited data about acetaminophen concentrations in the brain and no such data is available for newborns. The objective of the current study is to describe concentrations of acetaminophen in the fluid around the brain of infants after administration of acetaminophen.

Detailed description: The mechanism by which acetaminophen causes analgesia and antipyretic effect is not entirely clear. Recently a new COX isoenzyme was identified and termed COX 3. In humans this isoenzyme is most abundant in cerebral cortex and heart. Inhibition of COX-3 could represent a primary central mechanism by which acetaminophen decrease pain and possibly fever (10). An effect on of acetaminophen on presynaptic 5-HT(2) receptors in the hypocampus has been demonstrated (11) suggesting again that the primary effect of acetaminophen is in the CNS.

Many studies (12-16) described the pharmacokinetics of oral and rectal acetaminophen in infants and neonates. Yet, the data on acetaminophen concentrations in the CSF is very limited. Two studies in adults (17;18) used intravenous propacetamol and described concentrations of acetaminophen in the plasma and CSF. Acetaminophen was detected as early as 15 minutes after the administration and reached peak concentrations in the CSF at the 4th hour. A small study (19) of nine children who had indwelling ventricular drains found that cerebrospinal fluid concentrations lagged behind those of plasma with an equilibration half time of 0.72 h. This study did not describe CSF concentrations in neonates and used a dose of 40mg/kg, which is higher than the recommended dose in children. To the best of our knowledge there is no data on acetaminophen CSF concentrations in neonates.

The objective of the current study is to describe concentrations of acetaminophen in the CSF of infants after single administration of acetaminophen. A better understanding of the pharmacokinetics of acetaminophen and its penetration into the CSF will enable us to better predict the effects of this commonly used drug.

Eligibility criteria: Inclusion Criteria:

* Age: 1week - 2 years
* Rectal temperature \> 38.0OC
* A sepsis work up is indicated
* Acetaminophen was given prior to lumbar puncture (LP)

Exclusion Criteria:

* Hypersensitivity to acetaminophen
* Known metabolic disorder
* Known liver or kidney disease
* Hydrocephalus
* Informed consent could not be obtained from a legal guardian

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Zerifin
country: Israel
facility: Pediatric Emergency Unit Assaf Harofeh Medical center
Study officials:
affiliation: Assaf-Harofeh Medical Center
name: Eran Kozer, MD
role: PRINCIPAL_INVESTIGATOR
References: