[Methodologic problems in studies of pressure in the venous sinuses of the brain].

The adequacy of the indirect method for the liquorodynamic evaluation of intrasinusal pressure has been established. It was found that in patients with parasagittal meningiomas intrasinusal pressure does not depend on the size of the tumour and its relation to the superior sagittal sinus, or on intracranial hypertension (up to 28 mm Hg). In the phase of decompensation of intracranial hypertension the effective pressure of resorption increases. The quantitative characteristics of venous cerebral circulation and of liquorodynamics is of importance in evaluating the condition of compensatory mechanisms of the cerebrospinal system in various forms of neurosurgical pathology.