Isotope cisternography and conductance to outflow of CSF in normal pressure hydrocephalus.

In 50 patients with normal pressure hydrocephalus (NPH) the findings on lumbar isotope cisternography (ICG) were compared to the conductance to outflow of CSF (Cout) as measured by lumbo-ventricular perfusion. The purpose was to identify those ICG-characteristics that imply a low Cout and thus may indicate CSF shunting therapy.