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When it occurs in a major vein, it can, in some cases, cause deep vein thrombosis. The condition is also relatively common in the retina , and can cause partial or total loss of vision. An occlusion can often be diagnosed using Doppler sonography (a form of ultrasound ).
Deep vein thrombosis (DVT) is the formation of a blood clot within a deep vein. It most commonly affects leg veins, such as the femoral vein. [citation needed] Three factors are important in the formation of a blood clot within a deep vein—these are: [citation needed] the rate of blood flow, the thickness of the blood and; qualities of the ...
[21] [22] Thrombi can occlude veins (venous thrombosis) or arteries (arterial thrombosis). The etiology of thrombosis is described by Virchow's Triad, which includes hemostasis, vascular wall damage, and hypercoagulability. [21] Arterial thromboses significantly narrow or completely block arterial blood flow and oxygen delivery to tissues.
A venous embolus (mostly from deep vein thrombosis in the lower limbs) will travel through the systemic circulation, reach the right side of the heart, and travel through the pulmonary artery, resulting in a pulmonary embolism. Arterial thrombosis resulting from hypertension or atherosclerosis can become mobile and the resulting emboli can ...
Venous thromboembolism and superficial vein thrombosis account for about 90% of venous thrombosis. Other rarer forms include retinal vein thrombosis, mesenteric vein thrombosis (affecting veins draining blood from the gastrointestinal organs), cerebral venous sinus thrombosis, renal vein thrombosis, and ovarian vein thrombosis. [3]
In the worst case, a deep vein thrombosis can extend, or a part of a clot can break off as an embolus and lodge in a pulmonary artery in the lungs, known as a pulmonary embolism.The decision to treat deep vein thrombosis depends on its size, a person's symptoms, and their risk factors.
Oxygen is removed in the capillaries to be used by the brain. [10] After the oxygen is removed, blood reaches venules and later veins which will take it back to the heart and lungs. [10] A cerebral AVM causes blood to be shunted directly from arteries to veins because the capillary bed is lacking, causing a disrupted circulation. [10] [11]
Their presence implies thrombosis at a site of rapid blood flow that happened before death. They are more common in thrombi formed in the heart or aorta. [5] In veins or smaller arteries, where flow is not as constant, they occur less frequently. [5] They are also only seen on thrombi formed when blood is flowing.