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Related Experiment Videos

Cerebrospinal fluid retrieval in the conscious dog: a methods development study

R A Rockar1, K K Sandanaga, D E Burkett

  • 1Department of Clinical Studies, Philadelphia Veterinary Hospital, University of Pennsylvania, USA.

Journal of Investigative Surgery : the Official Journal of the Academy of Surgical Research
|January 1, 1995
PubMed
Summary

A novel chronic cerebrospinal fluid access system was developed for conscious dogs, enabling sustained CSF sampling and drug studies. Modifications improved long-term patency, overcoming initial technical challenges.

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Area of Science:

  • Neurosurgery
  • Pharmacokinetics
  • Animal Models

Background:

  • Chronic cerebrospinal fluid (CSF) access is crucial for neurological research and drug delivery.
  • Existing methods in conscious animal models often face limitations in duration and invasiveness.

Purpose of the Study:

  • To develop and evaluate a reliable chronic CSF access system in conscious dogs.
  • To assess the system's patency, safety, and utility for pharmacokinetic studies.

Main Methods:

  • Surgical implantation of a fenestrated, barium-impregnated silastic catheter into the subarachnoid space (C2 vertebra) coupled to a subcutaneous port.
  • Weekly CSF sampling for protein and cytology; calculation of albumin CSF/serum ratio to assess blood-brain barrier integrity.
  • Pharmacokinetic evaluation of intravenous acyclovir in CSF and plasma.

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Main Results:

  • Successful implantation in 5/8 dogs initially; CSF access maintained for 21±10 days.
  • Modified technique achieved long-term patency (>444 days) in 2 dogs.
  • Catheter failure attributed to malposition (early) or fibrous tissue reaction (chronic).
  • System supported repeated pharmacokinetic studies without complications.

Conclusions:

  • The modified chronic CSF access system is viable for long-term studies in conscious dogs.
  • The system facilitates pharmacokinetic evaluations and potentially other neurological research.
  • Addressing surgical placement and tissue reaction is key to ensuring system longevity.