, Volume 45, Issue 6, pp 377–380 | Cite as

Is there a correlation between operative results and change in ventricular volume after shunt placement? A study of 60 cases of idiopathic normal-pressure hydrocephalus

  • U. MeierEmail author
  • S. Paris
  • A. Gräwe
  • D. Stockheim
  • A. Hajdukova
  • S. Mutze
Diagnostic Neuroradiology


In patients with communicating or normal-pressure hydrocephalus, ventricular volume decreases following implantation of differential pressure valves. We implanted hydrostatic (Miethke dual-switch) valves in 60 patients with normal-pressure hydrocephalus (NPH) between September 1997 and December 2001. The patients underwent CT 1 year after operation, and we measured the Evans index. Although 83% of the patients showed no change in ventricular volume as assessed by this index, 72% nevertheless showed good to excellent and 16% satisfactory clinical improvement, while 12% showed no improvement. Moderate or marked reduction in ventricular size was observed in 17%, of whom 40% of these patients showed good to excellent and 20% satisfactory clinical improvement; 40% showed unsatisfactory improvement. The favourable outcome following implantation of a hydrostatic shunt thus did not correlate with decreased ventricular volume 1 year after operation, better outcomes being observed in patients with little or no alteration in ventricular size than in those with a marked decrease. Postoperative change in ventricular volume in NPH thus does not have the same significance as in patients with high-pressure hydrocephalus.


Normal-pressure hydrocephalus Ventricular size Shunt surgery Hydrostatic valves 


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • U. Meier
    • 1
    Email author
  • S. Paris
    • 2
  • A. Gräwe
    • 1
  • D. Stockheim
    • 2
  • A. Hajdukova
    • 1
  • S. Mutze
    • 2
  1. 1.Department of NeurosurgeryUnfallkrankenhaus BerlinBerlinGermany
  2. 2.Department of RadiologyUnfallkrankenhaus BerlinBerlinGermany

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