Gravitational valves: relevant differences with different technical solutions to counteract hydrostatic pressure

Acta Neurochir Suppl. 2006;96:343-7. doi: 10.1007/3-211-30714-1_71.


Two different technical principles of gravitational valves (G-valves) have been presented: counterbalancer and switcher G-valves. The objective of our prospective study was to look for clinically relevant differences between both. A total of 54 patients with normal-pressure hydrocephalus (NPH) were treated; 30 patients received an Aesculap-Miethke GA-Valve (GAV; counterbalancer), and in 24 patients an Aesculap-Miethke Dualswitch-Valve (DSV; switcher) was implanted. The opening pressure of the posture-independent valve was 5 cm H2O in both devices. The outcome was clearly better with the usage of the GAV than with the DSV. The frequency and severity of complications was pronounced in the DSV group. We recommend the Aesculap-Miethke-GAV valve with a low opening pressure in a posture-independent valve for patients with NPH.

Publication types

  • Controlled Clinical Trial

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Cerebrospinal Fluid Shunts / instrumentation*
  • Cerebrospinal Fluid Shunts / statistics & numerical data*
  • Drainage / instrumentation*
  • Drainage / statistics & numerical data*
  • Equipment Failure Analysis
  • Female
  • Germany / epidemiology
  • Gravitation
  • Humans
  • Hydrocephalus, Normal Pressure / epidemiology*
  • Hydrocephalus, Normal Pressure / surgery*
  • Hydrostatic Pressure
  • Male
  • Middle Aged
  • Treatment Outcome