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Doppler ultrasound of the neck and brain vessels (artery, vein)

Doppler ultrasound of the neck vessels (artery, vein)

Doppler ultrasound of the neck vessels (artery, vein) — method for studying the linear flow velocity (BFV), based on the Doppler effect (analysis of changes in the frequency of returning ultrasonic signals in comparison with the originally sent, depending on the speed of scanning of the vascular flow and the angle between it and the ultrasound beam).

Other factors affecting the linear flow velocity (BFV) are indicators of hematocrit, fibrinogen, and other indicators that determine the blood viscosity. Method allows to evaluate the linear flow velocity (BFV) in cm / sec in the carotid and vertebral arteries in severe traumatic brain injury, especially combined with a neck injury. Doppler ultrasound also used in ESRD, combined with damage to the adjacent arteries in acute and in the residual periods.

Carotid duplex ultrasound in the diagnosis of neck and brain vessels (artery, vein).

Doppler ultrasound of the neck vessels (artery, vein) and the brain is used by our physicians in diagnosing the following diseases:

cerebral ischemia, stroke
vertebro-basilar insufficiency (VBI)
vegetative-vascular dystonia (VVD)
cerebral blood flow
dizziness
sonitus
intracranial pressure
headache (migraine, cephalalgia)
traumatic head and brain injury (TBI), concussion and brain contusion
injuries to the neck, cervico-cranial syndrome
encephalopathy
Parkinson's disease
pituitary adenoma

Studies carried out on a special apparatus, using probes with a frequency of 02.10 MHz. Evaluate data Doppler ultrasound can be done in absolute terms or in comparison with similar parameters artery opposite side.

Contraindications to the use of Doppler ultrasound there is little, except for extensive wounds of soft tissues in the area of research, which prevents the application of the sensor.

Doppler ultrasound in the diagnosis of neck and brain vessels (artery, vein).

Doppler ultrasound vessels of the brain - a method of investigating linear flow velocity (BFV) in the brain through an intact skull, based on the Doppler effect. Use a sensor with a pulsating frequency of 2 MHz. For the best of his contact with the skin of the head used gel.

Scan operates through a kind of "ultrasonic window", located at 2-3 cm above the zygomatic arch. Fine-scale temporal bone in the least degree absorbs ultrasonic signals. At the specified position sensor The linear flow velocity (BFV) in the front, middle and posterior cerebral arteries. Directing the probe to the skull base, evaluate the linear flow velocity (BFV) in the segment of artery being probed.

Differentiation of vascular blood flow helps the direction indicator (to the sensor or away from) on the screen, knowing the estimated depth of the scanned area arteries, age-performance LCR, as well as a direct image of the pulse waves above and / or below the horizontal axis.

Main artery of the brain examined through foramen magnum (the head is reduced to the sternum, the sensor is strictly in the midline). This requires a certain caution, since alignment of the head can affect the intracranial pressure (ICP).

For the normal linear flow velocity (BFV) in the middle cerebral artery that carries up to 80% of the volume of hemispheric blood flow, accepted rate of 30-80 cm / sec (take into account the higher blood flow in children and its decline in the elderly and the elderly).

In severe head injury method is permissible to use as an additional diagnostic of brain death, in which initially indicated a progressive increase in systolic blood flow velocity (BFV), while lowering diastolic pulsation with a subsequent decrease in the amplitude of systolic peaks, the appearance of an inverse (reverse) flow and the gradual fading of pulsation. From the moment of biological death to the victim usually takes 1-3 days.

Doppler ultrasound in the diagnosis of neck and brain vessels (artery, vein).

The reduced dynamics are usually reflects the development of intracranial hypertension. At autopsy, while there may be a generalized edema and brain swelling with temporo-tentorial or axial break-stem structures.

In diffuse cerebral lesions figures mean linear flow velocity (BFV) may be symmetrical and may be close to normal age values. Focal injury with marked mass effect on CT scan followed by the asymmetry of the average linear flow velocity (BFV) with a predominance of him more often on the side of the bulk damage due to unilateral ischemia of brain. Possible and complete ipsilateral absence of Doppler signal with its subsequent identification after surgical removal of the substrate.

An increase in the average linear flow velocity (BFV) in excess of 100 cm / sec please be aware that it is based may lie not in addition to the controlled rise in intracranial pressure (ICP) cerebral vasospasm, compensatory hyperperfusion of the brain, and the combination of these factors. Using the dynamics increases the importance of transcranial Doppler and enables use of the dehydration, cardiovascular and other therapy.

Currently, there are large reserves of diagnostic possibilities of the method. Contraindications to its use there, except for gross damage to the temporal region.

If you have any questions about the conduct of Doppler ultrasound neck and brain vessels (artery, vein), you can specify them with our neurosurgeon or a neurologist on the phone: (499) 487–00–38


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