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Child's Nervous System

, Volume 16, Issue 12, pp 856–861 | Cite as

Application of clinically recorded ICP patterns – an extension of conventional shunt testing

  • M. U. Schuhmann
  • M. Engel
  • L. Runge
  • M. Samii
  • T. Brinker
Original Paper

Abstract 

Various methods of laboratory testing are currently being used to explore the hydrodynamic properties of shunts. We constructed a novel shunt-testing rig with a human-like compliance to be able to subject shunts to in-vivo recorded ICP patterns. The human-like situation was realized with a pear-shaped glass container with a non-linear, third-order pressure/volume characteristic similar to the CSF system. The new device also allows conventional shunt testing. Shunt performance in conventional pressure/flow tests (linear compliance) was compared to tests with human-like compliance. No clinically relevant differences were seen. Clinically recorded ICP waves (Lundberg type A and B) were reproduced before and after shunt implementation. Shunt insertion reduced pressure in the A-wave pattern to slightly negative values. Reproducing B-waves, the shunt dampened wave amplitude and pressure decreased below the opening pressure of the valve. In conclusion, the presented device allows a standardized reproduction of ICP patterns. The effects of shunt implantation can be studied.

Keywords Hydrocephalus Intracranial compliance Shunt evaluation Pressure/flow parameters Simulation of intracranial pressure patterns 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • M. U. Schuhmann
    • 1
  • M. Engel
    • 2
  • L. Runge
    • 2
  • M. Samii
    • 1
  • T. Brinker
    • 2
  1. 1.Department of Neurosurgery, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany e-mail: mschuh@gmx.de Tel.: +49-511-5322341 Fax: +49-89-244315056DE
  2. 2.Department of Neurosurgery, Nordstadt Hospital, Hannover, GermanyDE

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