Deep vein thrombosis, or deep venous thrombosis, (DVT) is the formation of a blood clot (thrombus) within a deep vein, predominantly in the legs. Non-specific signs may include pain, swelling, redness, warmness, and engorged superficial veins. DVT often develops in the calf veins and "grows" in the direction of venous flow, towards the heart. When DVT does not grow; it can be cleared naturally and dissolved into the blood (fibrinolysis).
By the end of July 2011, 701 out of 8,630 evacuees suspected with calf DVT, judged by inspections or medical interviews, were examined in 32 shelters, and 190 evacuees were confirmed to have calf DVT. The prevalence of DVT was 2.20%, which was 200 times higher than the usual incidence in Japan. The DVT prevalence seemed to decrease with time.
The basic treatments for the disease are Anticoagulation, which prevents further coagulation, home treatment, stockings, walking, and repeat imaging and IVC filters, thrombolysis, and thrombectomy. The aims of the physicians are to prevent clot becoming larger, clot becoming lose and traveling to lungs, new clot formation and Post thrombotic syndrome.
Major Research on Disease
The current major research on the diseases are efficacy of low doses of heparin for the prevention of the DVT after a major surgery, accuracy of the clinical assessment for DVT, Decreased plasma levels of activated factor VII in patients with deep vein thrombosis etc.