Sustained Effect 1 Month After CSF Tap Test in Normal Pressure Hydrocephalus

Background The response to CSF tap test (TT) has been considered an indicator of normal pressure hydrocephalus (NPH) and a predictor shunt effectiveness. Although the effects TT are thought be transient, duration those not studied in detail. Method We performed retrospective analysis 32 consecutive patients with NPH who underwent quantitative gait before, immediately after, 1 month after TT. Responses were defined as 15% or greater improvements step length walking speed. Result Immediately TT, 24 showed on Among sustained was maintained 16 patients. Furthermore, among 8 without immediate response, 5 delayed Conclusion parameters for approximately half NPH. Decreased tensile strength ventricular wall might explain effects.