[Effect of the width of anastomosis between extra- and intracranial arteries on its patency in the light of the flow continuity law and Bernoulli's law].

On the ground of the results obtained in microneurosurgical treatment of 60 patients with cerebral ischaemia the author analysed the factors affecting the patency of the anastomosis not connected directly with the surgical techniques. The analysis showed the significance of anastomosis width. A relatively wide anastomosis even in cases with correctly performed operation is not contributing to maintenance of patency. This may be explained, in the opinion of the author, by the relationship between the velocity of fluid flow, vessel cross-section area and value of the static pressure calculated from the stream continuity equation and Bernoulli's law.