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Scanning through the eye can help to visualise carotid siphon (bend of internal carotid artery within the cavernous sinus) and ophthalmic artery. [4] Doppler ultrasound allows for assessment of carotid arterial blood flow. Blood flow velocity is increased in areas of stenosis compared to normal. Therefore, doppler imaging substantially aids in ...
These changes can be due to bone pressure, artery pressure, enlarged lymph nodes, or an enlarged thyroid. These factors can squeeze the vein wall and block the blood flow. This blockage can range from a local narrowing to a complete blockage (occlusion). [7] Different parts of the IJV can be affected by different factors.
Chronic cerebrospinal venous insufficiency (CCSVI or CCVI) is a term invented by Italian researcher Paolo Zamboni in 2008 to describe compromised flow of blood in the veins draining the central nervous system. [1] [2] Zamboni hypothesized that it might play a role in the cause or development of multiple sclerosis (MS).
In "antegrade" flow, the blood flows according to the normal flow within the circulatory system (e.g. veins flow towards the heart while arteries flows away from the heart). In "retrograde" flow, the flow would reverse (e.g. veins flow away from heart or arteries flow towards the heart). However, "retrograde" flow can be both abnormal or normal.
Arterial occlusion is a condition involving partial or complete blockage of blood flow through an artery. Arteries are blood vessels that carry oxygenated blood to body tissues. [1] [2] An occlusion of arteries disrupts oxygen and blood supply to tissues, leading to ischemia. [1]
The blood supply to the carotid artery starts at the arch of the aorta (bottom). The carotid artery divides into the internal carotid artery and the external carotid artery. The internal carotid artery supplies the brain. Plaque often builds up at that division and causes a narrowing (stenosis).
Doppler arteriography, with probes at the fingertips and arms, tests the force and "smoothness" of the blood flow through the radial arteries, with and without having the patient perform various arm maneuvers (which causes compression of the subclavian artery at the thoracic outlet).
The external carotid artery is covered by the skin, superficial fascia, platysma muscle, deep fascia, and anterior margin of the sternocleidomastoid; it is crossed by the hypoglossal nerve, by the lingual, ranine, common facial, and superior thyroid veins; and by the digastricus and stylohyoideus muscles; higher up it passes deeply into the ...
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