[The usefulness of intraoperative high-frequency doppler flowmetry in surgeries for intracranial aneurysms].

The flowmeter enables estimation of blood flow velocity changes in small calibre arteries. The authors examined blood flow velocity patterns in the vessels during aneurysm operations and blood flow velocity and its disturbances inside aneurysm. Evaluation technique, technical data of the flowmeter use are described and the characteristics of the blood flow velocity picture in cerebral arteries obtained by this method is presented. The presented method enables a very precise estimation of blood flow velocity and detection of changes in flow patterns. The method may become very helpful in identification of the vessels in other types of cerebral surgery.