Sudden onset swelling and pain in limbs should always be attended to by a doctor. A number of things can cause swelling, including insect bites, bruises, muscle injury and, most concerning, a deep vein thrombosis (DVT). DVT is the medical term for when a blood clot forms in the venous blood vessels of the limbs. This condition can be potentially fatal and always requires medical attention.
Causes
Blood clots can form anywhere in the body, but are more commonly found in the blood vessels of the lower limbs and pelvis. The legs have two venous "systems", i.e. deep veins and superficial veins. When blood clots form in the deep veins, they can potentially dislodged fully or partially and end up in the lung where the can cause pulmonary embolism and death.
Read: DVT a danger during travel
A number of factors can cause a DVT. These include immobility for prolonged periods of time, surgeries (like hip replacements, which will also immobilise the patient), pregnancy, varicose veins, cancers and paralysis. Other factors increasing the risk for developing DVT's include: smoking, long haul flights and the use of birth control methods like oral contraceptive pills.
Symptoms and signs
Sudden onset pain, swelling, tenderness or discomfort in a limb are usually among the first symptoms. Swelling of the limb is usually unilateral (one side only). Redness and a marked temperature difference between the two limbs are important signs. The pain is usually intense and the patient can often not carry weight on the affected leg.
Read: Pain Centre
In the case of possible pulmonary embolism, sudden shortness of breath, chest pain and severe lightheadedness should be looked out for.
Diagnosis
When clinical suspicion arises that a DVT might be the cause of the symptoms and signs, a doctor will do blood tests like D-Dimer to check for possible clotting problems in your blood. Ultrasound of the veins of your legs and MRI's will also be performed.
Treatment
DVTs are treated with blood thinners (like warfarin, xeralto or pradaxa). These will prevent the clot from growing or new clots from developing.
Occasionally surgery is needed where the clot might be removed, or a filter is placed in the vena cava to prevent small pieces of clot that might break-off travelling to the lungs.
Mrs L had a couple of risk factors for development of DVT's: she is smoker, she works as an air hostess causing her to sit for long periods of time, and she also uses a birth control pill. Based on the supplied information, it is unlikely the clot has as yet caused any other problems.
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