Home / Diseases of the cardiovascular system / Venous blood circulation in the brain

Venous blood circulation in the brain

Physiology of the venous system of the brain at the moment still poorly understood. So that such venous blood circulation, and how to treat it, you know only by experienced phlebologists and neurologists. Although in fact, under such a complex term lies an ordinary violation of venous blood flow. In a healthy person at rest, the average speed of venous blood is approximately 220 mm/min, and the suffering from discirculatory reduced to 47 mm/min. Knowledge of anatomy of blood system of the brain will help to determine the symptoms caused by blood circulation, but also to carry out preventive measures.

The mechanism of venous discirculation

Cerebral veins can be divided into 2 subtypes: superficial and deep. Veins that are located in soft shell (surface), intended for the outflow of blood from the cortex, and those that are located in the Central areas of the hemispheres (deep veins) are used for outflow of blood from the white matter. The above vessels carry blood to the upper and lower longitudinal sinus. From these reservoirs the blood is pumped into the internal jugular vein, and then on the system of vertebral veins flowing from the brain.

This is a quite simplified description of a complex route of blood flow allows to understand why for such a long time doctors can't determine the true causes of disorders of cerebral circulation.

Bleeding in the brain

Chronic problems with cerebral venous circulation can cause bleeding in the cranial cavity. This occurs when the artery walls weaken and burst. Even a slight hemorrhage puts pressure on the brain, which can lead to loss of consciousness.

Hypoxia

Hypoxia occurs when a blocked or partially blocked venous outflow prevents the oxygen flowing to the brain. Persons with hypoxia often feel weakness and dizziness. If the vessel is not promptly unblock, it can cause coma and death.

Dyscirculatory encephalopathy (including atherosclerotic origin)

Hypertensive dyscirculatory encephalopathy is a painful syndrome that is triggered by disruption of venous blood flow. When a minor discirculative encephalopathy develops very slowly and occurs virtually asymptomatic. Syndrome disappears quickly upon removal of the initial causes of degenii. But with prolonged lack of oxygen or due to complete blocking of the venous outflow may end up brain-dead (after only 6 minutes after the complete cessation of blood flow).

Diagnostic methods

If the patient complains of several of the above symptoms, then all the efforts of the physicianwill aim to identify and cure the cause of discirculative. This is done by physical examination and examines medical history. To confirm the violation of the venous outflow is assigned multiple studies with visualization of veins in the brain and vertebral-basilar pool.

Full blood

Is assigned for the detection of antinuclear antibodies and determination of the erythrocyte sedimentation rate. If the results of the analysis confirm the presence of antibodies and low ESR parameter, it is assigned an additional study on the determination of the components of complement and antibody levels to anti deoxyribonucleic acid. The results of the above analyses allow to find out the cause of degenii was systemic lupus erythematosus or Wegener's granulomatosis.

Electroencephalogram (EEG)

Electroencephalogram impaired outflow of venous blood may be normal. But this study is highly recommended after unilateral infarction of the thalamus. The slowdown of the main alpha-rhythm indirectly indicates the coordination anomalies and problems with the blood flow.