L-dopa pharmacokinetics in plasma and cisternal and lumbar cerebrospinal fluid of monkeys.

Abstract:

:The pharmacokinetics of levodopa (L-dopa) in plasma and in cisternal and lumbar cerebrospinal fluid (CSF) were studied in Rhesus monkeys that were given 2- to 3-hour intravenous infusions of L-dopa. Steady-state L-dopa concentrations in cisternal CSF correlated well with plasma levels, and yielded a CSF:plasma ratio of 0.17. The disappearance of L-dopa from plasma and cisternal CSF compartments fits an open, two-compartment pharmacokinetic model. Although slower, the distribution and elimination half-lives for L-dopa from cisternal CSF (8.9 and 49.2 minutes, respectively) were of a similar magnitude to those from plasma (4.9 and 33.2 minutes, respectively). If cisternal CSF reflects brain extracellular fluid, then plasma pharmacokinetics of L-dopa are a reasonable approximation of those in the brain. In contrast to cisternal CSF, the disappearance of L-dopa from lumbar CSF fits an open, one-compartment model with an elimination half-life of 100 minutes. This indicates that the lumbar CSF compartment is unsuitable for investigation of the pharmacokinetics of L-dopa in the brain.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Hammerstad JP,Woodward WR,Gliessman P,Boucher B,Nutt JG

doi

10.1002/ana.410270507

subject

Has Abstract

pub_date

1990-05-01 00:00:00

pages

495-9

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

27

pub_type

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