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Chronic venous insufficiency (CVI) is a medical condition characterized by blood pooling in the veins, leading to increased pressure and strain on the vein walls. [1] The most common cause of CVI is superficial venous reflux, which often results in the formation of varicose veins, a treatable condition. [2]
The analysis determined that there was a 6% risk of developing deep vein thrombosis when wearing knee-high stockings and 4% when wearing thigh-high stockings, but also found significant heterogeneity, and thus it concluded that there is not enough evidence that one length is superior to the other, and suggests that knee-high compression ...
The reversed blood pools in the low third of legs and feet. [17] Unlike in the arterial ultrasound study, when the sonographer studies venous insufficiency, the vein wall itself has no relevance and attention is focused on the direction of blood flow. The objective of the examination is to see how the veins drain.
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.
The diagnosis of branch retinal vein occlusion is made clinically by finding retinal hemorrhages in the distribution of an obstructed retinal vein. Fluorescein angiography is a helpful adjunct. Findings include delayed venous filling, hypofluorescence caused by hemorrhage and capillary nonperfusion, dilation and tortuosity of veins, leakage due ...
Recently, central serous chorioretinopathy has been understood to be part of the pachychoroid spectrum. [5] [6] In pachychoroid spectrum disorders, of which CSR represents stage II, the choroid, the highly vascularized layer below the retina, is thickened and congested with increased blood vessel diameter, especially in the deep choroid (the so-called Haller's layer).
Cotton wool spots are commonly caused by changes to the retina secondary to diabetes, hypertension, or blockages to blood vessels to the retina, such as central retinal vein occlusion. [ 5 ] [ 8 ] While at one point believed to have been the result of nerve damage in the retina, interruptions to axoplasmic flow to these nerves may result from ...
The central retinal vein (retinal vein) is a vein that drains the retina of the eye. It travels backwards through the centre of the optic nerve accompanied by the central retinal artery before exiting the optic nerve together with the central retinal artery to drain into either the superior ophthalmic vein or the cavernous sinus .