Levetiracetam circulating concentrations and response in status epilepticus
Matthieu Perrenoud1, Pascal André2, Thierry Buclin2
1Neurology Service, Department of Clinical Neurosciences, Centre Hospitalier Universitaire Vaudois (CHUV) and University of Lausanne, Switzerland.
Epilepsy & Behavior : E&B
|September 22, 2018
Summary
Levetiracetam (LEV) exposure did not differ between status epilepticus (SE) responders and non-responders. A loading dose of 30 mg/kg appears appropriate for achieving therapeutic LEV levels quickly.
Area of Science:
- Pharmacology
- Neurology
- Clinical Pharmacy
Background:
- Intravenous levetiracetam (LEV) is a common treatment for status epilepticus (SE).
- Achieving therapeutic plasma concentrations (12-46 mg/l) rapidly is crucial for effective LEV treatment in SE.
- Understanding the correlation between LEV exposure and treatment response is essential for optimizing SE management.
Purpose of the Study:
- To evaluate the therapeutic response to levetiracetam in status epilepticus.
- To correlate patient response with levetiracetam exposure, assessed by plasma concentration monitoring and pharmacokinetic parameters.
- To determine if higher levetiracetam exposure is associated with better outcomes in SE treatment.
Main Methods:
- Retrospective analysis of a status epilepticus registry including patients treated since 2015.
- Inclusion criteria: at least one LEV plasma level measured within 36 hours post-loading dose.
- Bayesian maximum likelihood approach using a population pharmacokinetic model to estimate LEV exposure parameters; comparison between responders and non-responders.
Main Results:
- 29 patients with 45 plasma levels were analyzed, showing variability in LEV loading doses (17-38 mg/kg) and monitoring practices.
- No significant differences were observed in median plasma concentrations, estimated LEV exposure, peak, or residual levels between responders and non-responders.
- Therapeutic response was defined as SE cessation within 24 hours without additional antiepileptic drugs.
Conclusions:
- Levetiracetam exposure levels do not appear to significantly differ between patients who respond and those who do not respond to treatment for status epilepticus.
- Higher exposure to levetiracetam was not associated with improved treatment outcomes in this cohort.
- A loading dose of 30 mg/kg is suggested as appropriate for rapidly achieving target levetiracetam exposure levels; standardized sampling is necessary due to LEV's short half-life.
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