Von Willebrand's factor (vWF) is synthesized and stored primarily by the vascular endothelium.
The vascular endothelium forms the inner lining of blood vessels. Cells within this layer, specifically endothelial cells, are responsible for producing and releasing vWF.
vWF plays a crucial role in the initial stages of blood clotting (hemostasis) by helping platelets stick together (adhesion) and to the damaged vessel wall.
While organs like the liver and certain immune cells (like macrophages) have significant roles in blood physiology, they are not the primary sites for von Willebrand's factor synthesis. Eosinophils are involved in immune responses, not vWF production.
A young primigravida with 11 weeks pregnancy presents with sudden onset pain and swelling of left lower limb. Homan's sign is positive. Duplex ultrasonogram shows non- compressibility of veins in the affected region, with absent flow. The drug of choice for treatment is: