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  1. For 29 patients, hydrodynamic criteria of NPH were fulfilled and a ventriculoperitoneal shunt was performed. The purpose of the present buy viagra online study was to investigate whether meningeal fibrosis causes increased resistance to cerebrospinal fluid outflow (R(out) and/or increased B-wave activity and whether pathological changes in the brain parenchyma after brain compliance, causing increased B-wave activity. All 12 patients experienced relief of pain after trial stimulation and had their systems permanently implanted.