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Related Experiment Videos

Brain phenobarbital uptake during prolonged status epilepticus.

R P Simon1, J R Copeland, N L Benowitz

  • 1Department of Neurology, University of California, San Francisco 94143-0870.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|December 1, 1987
PubMed
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During status epilepticus, early phenobarbital administration enhances brain drug levels due to a disrupted blood-brain barrier. Later administration shows reduced brain phenobarbital uptake compared to controls.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Critical Care Medicine

Background:

  • Status epilepticus (SE) is a neurological emergency with significant morbidity.
  • Understanding drug delivery to the brain during SE is crucial for effective treatment.
  • Phenobarbital is a commonly used anticonvulsant for SE.

Purpose of the Study:

  • To investigate the impact of prolonged status epilepticus on phenobarbital brain uptake in sheep.
  • To determine the influence of different phases of status epilepticus on phenobarbital brain penetration.
  • To elucidate the role of the blood-brain barrier in phenobarbital delivery during SE.

Main Methods:

  • Utilized a sheep model of prolonged status epilepticus (3 hours).
  • Administered phenobarbital during early and established phases of SE.

Related Experiment Videos

  • Measured phenobarbital brain concentrations and correlated with hemodynamic parameters and brain pH.
  • Compared drug uptake between seizure and control groups.

    • Main Results:

    • Early SE phase (hypertensive) showed significantly higher brain phenobarbital concentrations compared to controls.
    • This elevated brain phenobarbital level persisted for up to 3 hours post-infusion.
    • Administration during the established SE phase (normalized hemodynamics) resulted in attenuated brain uptake, similar to controls.
    • Brain acidosis was observed during SE, persisting even after hemodynamic normalization.

    Conclusions:

    • The blood-brain barrier is compromised during the early, hypertensive phase of status epilepticus, facilitating increased phenobarbital brain uptake.
    • Phenobarbital administration timing is critical for optimizing brain drug concentrations during status epilepticus.
    • These findings highlight the dynamic changes in blood-brain barrier permeability during prolonged seizures.