*Corresponding author: Sinisa Franjić, Independent Researcher Citation: Siniša Franjić. (2026) “Disseminated Intravascular Coagulation is a Serious Blood Clotting Disorder”, Journal of Medical and Health Sciences, 1(1); 10.61148/JIMHS /001. Abstract Siniša Franjić. (2026) “Disseminated Intravascular Coagulation is a Serious Blood Clotting Disorder”, Journal of Medical and Health Sciences, 1(1); 10.61148/JIMHS /001.vessels. This condition simultaneously causes the depletion of platelets and clotting factors, leading to excessive bleeding. It arises as a result of various critical illnesses and is characterized by the occurrence of both blood clotting and bleeding at the same time. Keywords: DIC, Blood, Thrombosis, Pathology, Health Introduction DIC, or disseminated intravascular coagulation, represents a syndrome marked by the uncontrollable activation of coagulation within the blood vessels [1]. The key feature of DIC is the extensive activation of thrombin, which causes thrombosis leading to a significant reduction in clotting factors and platelets, subsequently resulting in severe bleeding. The coexistence of thrombosis and bleeding, coupled with the triggering of the inflammatory response, results in extensive damage to organs and increases mortality rates. Platelets Platelets are critical components in the process of blood coagulation and are tiny, nucleated cell fragments that derive from substantial precursor cells known as megakaryocytes found in the bone marrow [2]. Their average lifespan in the bloodstream is around ten days, after which they are cleared away by macrophages in the spleen. Platelets contain proteins that can contract and have two different types of granules that include various bioactive mediators necessary for proper platelet functionality. When a blood vessel gets injured, platelets quickly adhere to the damaged area, forming a temporary seal, a process significantly aided by von Willebrand Factor (vWF). This adhesion triggers platelet activation and the release of substances resulting in the secretion of several active elements. Serotonin, resembling histamine, causes blood vessels to constrict. Furthermore, certain platelet activators, such as ADP and thromboxane A2, which is a substance similar to a lipid-derived prostaglandin, are also released. These agents encourage platelet aggregation by partially binding to fibrinogen in the plasma, creating links between platelets and attracting more platelets from the bloodstream. Moreover, platelets undergo substantial shape changes that significantly increase their surface area. This group of clustered platelets is referred to as the primary hemostatic plug, which initially manages bleeding but can be dislodged or washed away. The establishment of this primary hemostatic plug defines what is known as primary hemostasis, the aspect of the hemostatic mechanism that does not rely on blood coagulation factors found in the serum. Aggregated platelets present phospholipids with a negative charge on their exterior. These phospholipids are essential for the processes involved in secondary hemostasis. This mechanism includes plasma coagulation factors, which are a sequence of inactive enzymes and cofactors that gather in the presence of the phospholipid surface and calcium ions, transforming into active enzymes. At the initial stages, thrombin is generated from its precursor, prothrombin. Thrombin is vital for secondary hemostasis, commonly referred to as humoral coagulation. A portion of the initially generated thrombin attaches to a particular receptor on the clustered platelets, leading to the contraction of the platelets and resulting in an irreversibly merged assembly of platelets and fibrinogen. This conglomeration creates a strong secondary hemostatic plug, with fibrin, derived from fibrinogen through thrombin's activity, being a major constituent of the developed thrombus. However, it is important to understand that the creation of the mature thrombus necessitates the collaboration of humoral coagulation factors. Thrombosis This highly critical disruption of the clotting mechanisms within the blood vessels arises when localized areas of thrombosis are concurrently activated across the entire vascular system [3]. Numerous triggers exist, but primarily, they function by increasing tissue factor expression on monocytes/macrophages and endothelial cells—cells that usually do not have this on their surface—thereby initiating the clotting process. In cases caused by infections, this occurs through the creation of a lipopolysaccharide/lipopolysaccharide-binding protein complex, which attaches to CD14 on macrophages/monocytes, resulting in activation and expression of tissue factor. The process of forming and removing several thrombi in the smaller blood vessels and capillary network rapidly depletes the plasma reserves of both coagulation and antithrombotic factors. Depending on wh
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