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Biomedical subjects

S E Semenov

Publications and source records attributed to S E Semenov.

7 recordsLinked to original sources
PubMed2000

[The use of magnetic resonance venography in diagnosis of cerebral venous blood flow disorders].

The paper presents an examination of 85 patients aged 16-72 years with cerebral venous dyscirculation resulted from the obstruction of cerebral venous sinuses, major veins of the neck and upper regions of the mediastenum. 70 healthy volunteers were also observed. Magnetic-resonance venography of brachyocephal veins and venous sinuses and ultrasound duplex scanning of internal jugular veins together with colored mapping of the blood flow were performed. Both the causes and the magnetic-resonance semiotics of the obstructive damages of brachyocephal veins and of the cerebral venous sinuses were described. The criteria for hemodynamic significance of the obstruction of brachyocephal veins were defined in case of extravasal compression of brachyocephal veins.

Adolescent↗
PubMedDate not supplied

[The study of cerebral venous blood flow disturbance peculiarity in the norm and under the extravasal compression of brachiocephalic veins with the use of magnetic resonance venography and ultrasound duplex scanning].

The MR-venography of the veins and brain venous sinuses, brachiocephalic veins an internal jugular veins duplex scanning have been performed in order to study the distinctions of cerebral venous hemodynamics of healthy people and the patients with venous encephalopathy caused by the extravasal compression of the brachiocephalic veins at the neck level and the superior sections of mediastinum. It has been revealed that the blood flow reducing in transverse brain sinuses occurs not only in the case of outflow disorder in the distal sections of the venous system, but also in norm. This reducing depends on anatomic constitution of confluens sinuum and the venous angle type of brachiocephalic veins. The three venous angle types of brachiocephalic veins have been distinguished: y-type, mu-type and Y-type. It has been registered that in case of the mu-type angle the blood flow can be reduced in norm due to peripheral resistance increase at the physiological bends of nearly a right angle type. The distinctions of hemodynamics in case of venous obstruction in contrast to arterial obstruction have been described. It has been registered that in case of outflow trouble in one of the internal jugular veins the speed and the volume of the blood flow in it are progressively reduced depending on the duration and the manifestation of compression. All this results in narrowing of the vein diameter from the affected side, and in compensatory distention of the diameter and increase of blood flow volume in the contralateral internal jugular vein, vertebral and external jugular veins, in succession.

Adult↗