(See also Overview of Blood Clotting Disorders Overview of Blood Clotting Disorders Blood clotting (coagulation) disorders are dysfunctions in the body's ability to control the formation of blood clots. These dysfunctions may result in Too little clotting, leading to abnormal... read more .)
Disseminated intravascular coagulation (DIC) begins with excessive clotting How Blood Clots Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more . The excessive clotting is usually stimulated by a substance that enters the blood as part of a disease (such as an infection or certain cancers) or as a complication of childbirth, retention of a dead fetus, or surgery. People who have a severe head injury or who have tissue damage caused by shock Shock Shock is a life-threatening condition in which blood flow to the organs is low, decreasing delivery of oxygen and thus causing organ damage and sometimes death. Blood pressure is usually low... read more , burns Burns Burns are injuries to tissue that result from heat, electricity, radiation, or chemicals. Burns cause varying degrees of pain, blisters, swelling, and skin loss. Small, shallow burns may need... read more , frostbite Frostbite Frostbite is a cold injury in which an area of the body is frozen. Extreme cold may freeze tissues, destroying them and sometimes the surrounding tissues. The area may be numb, white, swollen... read more , other injuries, or even a bite by a poisonous snake Snakebites Venomous snakes in the United States include pit vipers (rattlesnakes, copperheads, and cottonmouths) and coral snakes. Severe envenomation can cause damage to the bitten extremity, bleeding... read more are also at risk. As the clotting factors and platelets Blood Clots: Plugging the Breaks Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more (cell fragments that circulate in the bloodstream and help blood clot) are depleted, excessive bleeding occurs.
DIC may develop
Slowly developing disseminated intravascular coagulation typically results from cancer, aneurysms, or cavernous hemangiomas (collections of dilated blood vessels).
DIC that develops suddenly usually causes bleeding, which may be very severe. If the condition follows surgery or childbirth, bleeding may be uncontrollable. Bleeding may occur at the site of an intravenous injection or in the brain, digestive tract, skin, muscles, or cavities of the body.
If DIC develops more slowly, as in people with cancer, then clots in veins (deep venous thrombosis Deep Vein Thrombosis (DVT) Deep vein thrombosis is the formation of blood clots (thrombi) in the deep veins, usually in the legs. Blood clots may form in veins if the vein is injured, a disorder causes the blood to clot... read more ) are more common than bleeding. If clots form in veins (usually in the legs), the person may have swelling, redness, or pain in the area. However, sometimes no symptoms develop. A clot that forms in a vein may break free and travel (becoming an embolus) to the lungs. Clots in the lungs Pulmonary Embolism (PE) Pulmonary embolism is the blocking of an artery of the lung (pulmonary artery) by a collection of solid material brought through the bloodstream (embolus)—usually a blood clot (thrombus) or... read more may make people short of breath.
Blood tests may show that the number of platelets in a blood sample has dropped (platelets are used up when blood clots) and that the blood is taking a long time to clot. The diagnosis of DIC is confirmed if test results show abnormally increased quantities of plasma D-dimer (a substance that blood clots release when they break down; more D-dimer indicates that more clots are being produced than usual) and often a low or decreasing level of fibrinogen (a protein that is consumed when blood clots).
The underlying disorder must be identified and corrected, whether it is an obstetric problem, an infection, or a cancer. The clotting problems subside when the cause is corrected.
DIC that develops suddenly is life threatening and is treated as an emergency. Platelets and clotting factors are transfused to replace those depleted and to stop bleeding. Heparin may be used to slow the clotting in people who have more chronic, milder DIC in which clotting is more of a problem than bleeding.