The resistance to cerebrospinal fluid absorption in humans. A method of evaluation by lumbo-ventricular perfusion, with particular reference to normal pressure hydrocephalus.

In order to measure the resistance to cerebrospinal fluid absorption in humans a lumbo-ventricular perfusion test, using several intraventricular pressure levels, has been developed. The test has been performed in 15 patients fulfilling criterias of normal pressure hydrocephalus. A considerable variation in the resistance to cerebrospinal fluid absorption revealed by the test indicates that clinical and pneumoencephalographic signs of normal pressure hydrocephalus are of little use in the selection of patients who may benefit from shunting procedures.