Which term denotes a clot in a vein, often in the leg?

• A. Endocarditis
• B. Deep Vein Thrombosis
• C. Myocardial Infarction
• D. Mitral Valve Prolapse

Answer: (B)

A clot in a vein, often in the leg, is called a deep vein thrombosis. This venous clot forms in the deep veins, typically in the lower limbs, and can cause swelling, pain, warmth, or redness. If a piece breaks off, it can travel to the lungs and cause a potentially serious pulmonary embolism, which is why timely recognition and treatment matter. The tendency for veins to form clots involves three factors: slower blood flow (stasis), injury to the vein wall, and a state that makes blood more likely to clot (hypercoagulability). Clinically, they’re diagnosed with a duplex ultrasound, and sometimes a D-dimer test is used to assess the likelihood of a clot. Treatment focuses on preventing clot growth and new clots with anticoagulation for a period determined by risk factors, and in some cases compression therapy or other interventions if anticoagulation isn’t possible. The other terms refer to conditions of the heart or valves rather than a clot in a vein: infection of the heart lining or valves, a heart attack due to a blocked coronary artery, and a valve leaflet abnormality, respectively.