Deep vein thrombosis (DVT) is a blood clot in a vein deep in the body. Veins are blood vessels with valves that help prevent backward blood flow. Blood is pushed through the veins in legs and arms when muscles contract.
Deposits of red blood cells and clotting elements in the blood can build up in a vein. This build up leads to a blood clot. Clots usually occur in the legs, but can occur in other locations. As the clot grows, it blocks blood flow in the vein.
Deep Vein Thrombosis
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Several factors contribute to clot formation, including: Slow blood flow, often due to lying or sitting still for a long period of time
Pooling of blood in a vein, often due to:
ImmobilityMedical conditionsDamage to valves in a vein or pressure on the valves, such as during pregnancyInjury to a blood vesselClotting problems, which can occur due to aging or diseaseCatheters placed in a vein
Risk factors for DVT include: Personal or family history of deep vein thrombosisHospitalizationNot moving your body, especially during travelSurgery, especially involving bones or joints
Medical conditions, such as:
Varicose veinsCancerHeart failureHeart attackInflammatory bowel diseaseBlood disordersBlood poisoning
, also called sepsis
ObesityPregnancy, especially in women of increased age and those who are obese, smoke, or have certain pregnancy-related conditions such as preeclampsiaInherited or natural genetic changes that can alter your protein levels
Taking medications such as
birth control pills
Symptoms occur when: The clot interferes with blood flow in the veinLocal inflammation occursA clot breaks free and travels to the lungs
Some patients may not have any symptoms until the clot moves to the lungs. This condition is called
Symptoms of DVT may include: PainSwelling of a limbTenderness along the vein, especially near the thighWarmthRedness, paleness, or blueness of the skin of the affected limb
The doctor will ask about your symptoms and medical history. A physical exam will be done.
Your blood and blood flow may be tested. This can be done with:
Blood testsImpedance plethysmographyDuplex venous ultrasound
You may have images taken. This can be done with
Treatment aims to: Prevent pulmonary embolismStop the clot from growingDissolve the clot, if possible
This may include: Resting in bedElevating the affected limb above the heartWearing compression stockings as advised by your doctor
You may be prescribed blood thinning medication to prevent additional clots from forming. These may be given by injection or by mouth.
This treatment may be continued long-term.
In some cases, a filter may be placed in the inferior vena cava. The vena cava is a major vein. Blood from the lower body returns to the heart through this vein. The filter may trap a clot that breaks loose before it travels to the lungs.
General prevention measures include: Having tests that monitor your use of blood thinners.Do not sit for long periods. If you are in a car or airplane or at a computer, get up often and move around.Do not smoke.
If you are admitted to the hospital, talk to your doctor about how to prevent blood clots, such as: Get out of bed and walk as soon as possible during your recovery.
If you are restricted to bed:
Do range of motion exercises in bed.Change your position at least every two hours.Wear compression stockings to promote venous blood flow.Use a pneumatic compression device. This device uses air to compress your legs and help improve venous blood flow.If prescribed by your doctor, take medication to reduce blood clots. This medication can reduce your chance of death due to blood clots.
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http://www.ebscohost.com/dynamed. Updated May 2, 2013. Accessed May 7, 2013.
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Last reviewed March 2014 by Michael J. Fucci, DO
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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