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Plasma baclofen levels in children receiving continuous intrathecal baclofen infusion
1Department of Neurosurgery, Children's Hospital of Pittsburgh, Pennsylvania 15213, USA. Leland_Albright@poplar.chp.edu
Insights
Plasma baclofen concentrations were undetectable in children receiving continuous intrathecal baclofen infusion for cerebral spasticity. This suggests minimal systemic absorption from this targeted drug delivery method.
Area of Science:
- Neurology
- Pharmacology
- Pediatrics
Background:
- Cerebral spasticity is a common motor disorder in children.
- Intrathecal baclofen infusion is a treatment option for severe spasticity.
- Understanding systemic drug absorption is crucial for managing treatment.
Purpose of the Study:
- To measure plasma baclofen concentrations in pediatric patients receiving continuous intrathecal baclofen infusion.
- To assess potential systemic exposure to baclofen via intrathecal delivery.
Main Methods:
- Assayed plasma samples from six pediatric patients (ages 8-18).
- Patients received continuous intrathecal baclofen infusion at doses of 77-400 micrograms/day.
- Used a limit of quantification of 10 ng/mL for plasma baclofen.
Main Results:
- Plasma baclofen levels were at or below the limit of quantification (10 ng/mL) in all analyzed patients.
- No detectable systemic baclofen was found in the study cohort.
Conclusions:
- Continuous intrathecal baclofen infusion in children results in minimal to undetectable plasma baclofen concentrations.
- This indicates a high degree of drug specificity to the intrathecal space with limited systemic absorption.
- Further research may explore long-term implications and optimal dosing strategies.
Abstract:
To determine the plasma baclofen concentrations of children undergoing continuous intrathecal baclofen infusion for treatment of cerebral spasticity, we assayed plasma samples from six children, 8 to 18 years of age, who were receiving intrathecal baclofen at constant rates of 77 to 400 micrograms/day. Plasma levels were at or below the limit of quantification (10 ng/mL) in all patients.