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Venous thrombosis is the blockage of a vein caused by a thrombus (blood clot). A common form of venous thrombosis is deep vein thrombosis (DVT), when a blood clot forms in the deep veins. If a thrombus breaks off ( embolizes ) and flows to the lungs to lodge there, it becomes a pulmonary embolism (PE), a blood clot in the lungs.
Stroke is a serious condition of blood vessel disorder caused by the stop of blood supply to the brain. Brain cells with ceased oxygen supply from blood will die in millions per second. [ 14 ] Not only is it one of the major causes of death around the world, it is also the cause of permanent disability.
It most commonly affects leg veins, such as the femoral vein. Three factors are important in the formation of a blood clot within a deep vein—these are: the rate of blood flow, the thickness of the blood and; qualities of the vessel wall. Classical signs of DVT include swelling, pain and redness of the affected area. [3]
A transient ischemic attack (TIA) is also called a “mini stroke”. The symptoms can be similar but usually only last a few minutes and resolve within 24 hours . stefanamer/istockphoto
Layers of vein wall shown in comparison to arterial wall. There are three sizes of vein, large, medium, and small. Smaller veins are called venules. The smallest veins are the post-capillary venules. Veins have a similar three-layered structure to arteries. The layers known as tunicae have a concentric arrangement that forms the wall of the vessel.
Thrombolysis is the injection of an enzyme into the veins to dissolve blood clots, and while this treatment has been proven effective against the life-threatening emergency clots of stroke and heart attacks, randomized controlled trials [139] [140] [141] have not established a net benefit in those with acute proximal DVT.
As a result of this blockage, blood flow in the vessel stops—a condition called thromboembolism. [ 1 ] Thromboembolism is a condition in which a blood clot ( thrombus ) breaks off from its original site and travels through the bloodstream (as an embolus ) to obstruct a blood vessel, causing tissue ischemia and organ damage.
Dr. Denniston notes that signs of poor blood circulation can include leg pain after walking, cold hands and feet, white fingertips, varicose veins, slow wound healing, numbness, tingling, blue ...