[Changes in cerebrospinal fluid pressure in patients with hydrocephalus of various intensities]

In 12 patients with hydrocephalus caused by posterior fossa tumours continuous measurements of intraventricular CSFP were done before and after implantation of ventriculoatrial valve and after tumour removal. A fall of the mean CSFP from 31.57 mm Hg to 15.32 mm Hg was observed after valve implantation, and a further fall of the mean CSFP to 10.55 mm Hg after removal of the tumour. After valve implantation pathological A and B waves disappeared. Absence of improvement after different stages of treatment indicated poor functioning of the valve, but it was observed also in patients with inoperable tumours.