title: Penetration of zidovudine into the cerebrospinal fluid of patients infected with HIV.
abstract: OBJECTIVE
  To investigate penetration of zidovudine (ZDV) into the cerebrospinal fluid (CSF) of HIV-infected patients for whom a lumbar puncture was indicated.
  
  
  METHODS
  A prospective study.
  
  
  METHODS
  General 525-bed hospital with special funding for treatment and research of HIV-infected patients.
  
  
  METHODS
  Thirty-nine patients with a medical indication for lumbar puncture who used ZDV chronically were included in this study (50 samples in total).
  
  
  METHODS
  Determination of ZDV and proteins in CSF and plasma samples.
  
  
  RESULTS
  CSF concentrations of ZDV showed little fluctuation 1-8 h after the last ingestion of ZDV. In contrast, plasma levels displayed large variability in this period and decreased exponentially over time. As a result, the CSF/plasma ratio increased linearly over time. No significant relation between the ZDV dose, neither the medical indication for lumbar puncture nor the protein ratio (as a measure for the integrity of the blood-brain barrier), and CSF levels of ZDV was found. The CSF/plasma ratio of ZDV did not give essential information on drug distribution into CSF.
  
  
  CONCLUSIONS
  Penetration of ZDV into the CSF appears to be independent of the dose (range, 200-1250 mg daily), which may be an explanation for the efficacy of low doses of ZDV in the prevention and treatment of HIV-related neurological diseases. ZDV levels were at steady-state during the first 6 h after ingestion. The CSF/plasma ratio of ZDV concentrations is not an appropriate marker for drug penetration into CSF.
authors.affiliation: Department of Pharmacy, Slotervaart Hospital, Amsterdam, The Netherlands.
authors.forename: D M
authors.initials: DM
authors.lastname: Burger
authors.forename: C L
authors.initials: CL
authors.lastname: Kraaijeveld
authors.forename: P L
authors.initials: PL
authors.lastname: Meenhorst
authors.forename: J W
authors.initials: JW
authors.lastname: Mulder
authors.forename: C H
authors.initials: CH
authors.lastname: Koks
authors.forename: A
authors.initials: A
authors.lastname: Bult
authors.forename: J H
authors.initials: JH
authors.lastname: Beijnen
mesh_terms: D000328:Adult; D001812:Blood-Brain Barrier; D005260:Female; D015658:HIV Infections / Q000134:cerebrospinal fluid* / Q000188:drug therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011506:Proteins / Q000032:analysis; D013129:Spinal Puncture; D015215:Zidovudine / Q000008:administration & dosage / Q000097:blood / Q000134:cerebrospinal fluid*
chemical_list: D011506:Proteins; D015215:Zidovudine