Deep vein thrombosis is usually caused by a combination of different underlying conditions:
Blood flow in the veins is slowed down because of restricted movement for a long period of time (illness, after surgery, long-distance traveling).
The risk of getting DVT is increased with a condition that causes blood to clot (coagulate) more easily than normal. Some of these conditions include:
Infections or inflammation can promote thrombus formation by affecting the lining surface of the vein, e.g. through vessel wall damage and increased coagulability.
If the wall of a blood vessel is damaged, it may become narrowed or blocked, which can cause a blood clot to form. Blood vessels can be damaged by injuries such as broken bones or severe muscle damage.
DVTs are rare in pregnancy, although pregnant women are 3 to 4 times more likely to develop thrombosis than non-pregnant women of the same age. A clot can form at any stage of pregnancy and up to six weeks after giving birth.
In addition, several risk factors for the development of DVT exist.
About one of every two to three patients with previous DVT will develop a long-term complication known as post-thrombotic syndrome (PTS), despite optimal anticoagulant treatment. PTS is a progressive disease and it can show up as chronic pain, swelling, and discoloration of the leg and, in late stages, as open leg ulcers.
The likelihood of another clot forming is high once you have had aDVT event. The effects of PTS are long lasting and can lessen your quality of life substantially.
Another complication of DVT is a condition known as pulmonary embolism (PE) which occurs when a blood clot breaks loose and travels through the vessel to the lungs. A pulmonary embolism can be fatal if the blood clot significantly blocks blood flow through the lungs.
Nearly 50% of all DVT cases have no noticeablesymptoms. If symptoms are present, they can include leg pain and tenderness, swelling in the calf muscle, ankle, foot, or thigh - usually in one leg only. At times, the skin feels warm and is reddened.
Are you over 60? Are you travelling long distances, thereby sitting for prolonged time with restricted mobility? Are you overweight and/or lead a sedentary lifestyle? If you answered yes to any of these questions, you may be at risk for developing DVT.
Other risk factors include:
Diagnosis of DVT can be made quickly with a simple ultrasound scan that is painless and risk-free. A specific blood test may be performed to measure the level of “D-dimers” which is a sign of recent clotting. Early diagnosis and treatment greatly reduce your risk of serious complications.
There are other tests that your physician may recommend depending on your medical history.
Deep vein thrombosis (DVT) is classified as an acute venous disorder.