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Thrombosis & Pregnancy

Source: www.thrombosis-charity.org.uk
Topic: Thrombosis
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Sort Desciption: What is thrombosis? A blood clot in the vein is called a venous thrombosis, and an example of this is deep vein thrombosis (DVT) when a blood clot occurs in a deep vein, usually in the leg. ...

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What is thrombosis? A blood clot in the vein is called a venous thrombosis, and an example of this is deep vein thrombosis (DVT) when a blood clot occurs in a deep vein, usually in the leg. In a pregnant woman, a DVT is most often found in the leg or the pelvis. The body has natural systems to stop excessive clotting. Some people are born with a tendency for these systems not to work properly. This gives them an increased risk of blood clots. Doctors call this thrombophilia. Many deep venous thromboses in young women during pregnancy are the first sign of an underlying thrombophilia. Often there is a family history of thrombosis with relatives like mother, father, aunts and uncles having been affected and this can be passed down through the generations. If you have already had a clot, or there is a family history of clotting, you may be offered a blood test to determine if you have a thrombophilia. Why are there greater risks of blood clots during pregnancy? Thrombosis can affect anyone, but being pregnant makes your blood more likely to clot. Doctors believe that the changes in clotting of the blood are designed to reduce bleeding at the time of normal delivery. When youre carrying a baby there is a dramatic reduction in the speed of blood flow in your veins, which carry the blood from your legs back to the heart. Doctors think that this is due to the effect of pregnancy hormones on the veins and also because of the womb getting bigger as the pregnancy advances. The reduction in blood flow becomes obvious in pregnancy by 16 weeks and is at its most sluggish closer to full-term as your body gets ready for the actual delivery. The blood flow does not return to normal until six weeks after delivery. This sluggish flow in the veins is why many women get some swelling of the legs when they are pregnant. It is this reduction in blood flow, combined with the increased clotting tendency while pregnant that can result in a clot in the leg. ...

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