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Deep venous thrombosis
Deep venous thrombosis is a condition in which a blood clot forms in a vein that is deep inside the body.
Deep venous thrombosis (DVT) mainly affects the large veins in the lower leg and thigh. The clot can block blood flow. If the clot breaks off and moves through the bloodstream, it can get stuck in the brain, lungs, heart, or other area, leading to severe damage.
- Cigarette smoking
- Giving birth within the last 6 months
- Medications such as estrogen and birth control pills
- Recent surgery (especially hip, knee, or female reproductive organ surgery)
- Sitting for a long time, such as on a long plane or car trip
- Changes in skin color (redness) in one leg
- Increased warmth in one leg
- Leg pain in one leg
- Leg tenderness in one leg
- Swelling (edema) of one leg
If heparin is given continuously through a vein (IV), you must stay in the hospital. However, newer forms of heparin that can be given by injection once or twice a day can sometimes be used. You may not need to stay in the hospital as long, or at all, if you are prescribed this newer form of heparin.
The drug warfarin is usually prescribed along with heparin. Warfarin is taken by mouth and is usually used for long-term therapy. It takes several days to fully work. Heparin is continued until the warfarin has been fully effective for at least 24 hours. People usually take warfarin for a minimum of 3 months, but sometimes they must take it for the rest of their lives, depending on their risk for another clot.
You will need frequent lab tests to check the thickness of your blood when you first start taking warfarin. This lets your health care provider properly adjust your dose.
In rare cases, surgery may be needed if medicines do not work. Surgery may involve:
- Placement of a filter in the body's largest vein to prevent blood clots from traveling to the lungs
- Removal of a large blood clot from the vein or injection of clot-busting medicines
Many DVTs disappear without a problem, but they can return. Some people may have long-term pain and swelling in the leg known as post-phlebitic syndrome. Wearing tight (compression) stockings during and after the DVT may help prevent this problem.
A blood clot that breaks free in the leg and travel to the lungs (pulmonary embolus) can be life threatening. Rapid treatment of DVT helps prevent this problem.
Doctors may prescribe blood thinners to help prevent DVT in people at high risk, or those who are undergoing high-risk surgery.
Sometimes patients in the hospital wear special soft boots that automatically (and gently) squeeze the calves periodically. This is called intermittent pneumatic compression. It helps keep blood moving and prevents blood clotting.
Moving your legs often during long plane trips, car trips, and other situations in which you are sitting or lying down for long periods of time can also help prevent DVT.