[Vascular changes in the cerebral cortex in experimental ligation of the superior vena cava].

Venous congestion in the cerebral hemispheres produced by means of the anterior vena cava ligation is accompanied with an uneven character of vascular changes in the hemisphere cortex. Under the same experimental conditions, manifestations of the venous congestion in different animals can have a light, middle and severe degree, each of them being characterized with its own morphological and quantitative peculiarities. The disturbance of the venous outflow from the hemisphere cortex results in certain changes not only in the venous and capillary, but also in the arterial part of the blood bed. The manifestation of the vascular changes can be different: from a comparatively light venous plethora up to multiple venous and arterial hemorrhages. The ligation of the anterior vena cava in all cases produces an acute venous congestion in the cerebral hemisphere cortex, its manifestations begin gradually to compensate and normalize after the first two days. The process is gradually completing by the end of the first month, although consequences of the vascular changes remain in the cortex during a long period of time. A variant of the venous congestion course is revealed when during 1.5-2.5 months a decompensation stage as a manifestation of some secondary disorder in the venous stream in the anterior vena cava system is developing. Certain unevenness in distribution of the vascular changes throughout the hemisphere areas is revealed; it is connected with peculiarities of the anatomical structure of different parts of the cortical blood bed.