About Disseminated Intravascular Coagulation

Overview

Disseminated Intravascular Coagulation (DIC) is a serious condition where blood clots form throughout the body's small blood vessels. These blood clots may reduce blood supply to organs such as the liver, kidney, or brain. In addition, this overactive clotting uses up the body's clotting factors and platelets, leading to a high risk of bleeding. DIC may lead to organ damage and can be life-threatening. Underlying conditions like sepsis (infection in the blood), severe trauma, advanced cancer, or liver disease can trigger DIC. The diagnosis of DIC is challenging because there isn't a single test to confirm it, so doctors rely on a combination of clinical signs and laboratory tests to identify it. There is no specific treatment for DIC. Treatment is primarily supportive, with the objective of identifying and treating the underlying cause of DIC.

Causes and Risk Factors

Disseminated intravascular coagulation can be caused by various medical conditions in which tissue damage and inflammation triggers excessive thrombin production. This leads to overactive clotting and may result in DIC. Medical conditions that may cause DIC include:

Sepsis (infections of the blood by bacteria or fungus)
Trauma
Severe tissue injury such as burns
Cancers, especially leukemias
Pregnancy complications
Vascular (blood vessel) disorders
Toxins
Inflammation conditions, such as pancreatitis
Liver disease
HIV infection

Treatment guidelines emphasize that addressing the root cause of DIC, such as treating sepsis or other contributing factors, is crucial in reversing this coagulation disorder.

Symptoms

Common symptoms of DIC include:

Fever
Bleeding and bruising at multiple parts of the body
Decreased blood pressure
Shortness of breath
Confusion or memory loss

As DIC progresses to higher severity, additional symptoms may occur such:

Hypotension (low blood pressure)
High fever
Difficulty breathing

Diagnosis

To diagnose DIC, healthcare providers may perform several blood tests, including:

Complete Blood Count (CBC): Measures the number of red and white blood cells and platelets in blood. Low blood cell counts (cytopenia) and low platelet count (thrombocytopenia) are commonly seen with DIC.
Fibrinogen level: Assesses the amount of fibrinogen in the blood. Decreased levels are indicative of DIC.
Prothrombin time (PT) and Partial Thromboplastin Time (PTT): Measure how long it takes for blood to clot. Prolonged PT and PTT are signs of DIC.
Fibrin degradation products (FDPs): Detects the presence of breakdown products from fibrin clots. Elevated levels suggest DIC.
D-dimer test: Measures the level of D-dimer in the blood, which indicates the presence of blood clots. High levels are associated with DIC.
Kidney and Liver function tests: High creatinine (a measure of kidney health) and elevated liver enzymes are associated with DIC.
C-reactive protein (CRP): Measures the presence and extent of inflammation in the body. CRP is elevated with DIC.

Additional examinations, tests, and procedures may be performed to determine the extent and severity of DIC:

Thromboelastography: Evaluates how well blood clots by measuring clot formation and breakdown. It provides a comprehensive view of coagulation status.
Scoring systems: Various scoring systems, such as those from the International Society on Thrombosis and Haemostasis (ISTH) or other medical organizations, are used to assess the severity of DIC based on specific criteria like platelet counts, fibrinogen levels, PT, and FDPs.

Treatment Options

The goals of treating DIC aim to restore the balance between clot formation and clot breakdown in the body. The overall treatment aim is to stabilize blood clotting processes, prevent excessive bleeding, and improve outcomes for individuals with DIC.

Identification and treatment of the underlying cause of DIC are crucial to managing DIC. Treatments may involve addressing the underlying cause of DIC, such as treating infections or controlling cancer growth, to help improve coagulation abnormalities associated with DIC.
Supportive treatment may include:
- Managing excessive blood clotting:
  - Blood thinner medications such as heparin may be used.
  - Recombinant soluble human thrombomodulin (rTM) helps counteract clotting and inflammation in the body. It may be helpful to treat DIC caused by some cancers or sepsis.
- Managing bleeding:
  - Plasma transfusions to replace blood clotting factors may be used.
  - All-trans-retinoic acid (ATRA) combined with anti-fibrinolytic agents like tranexamic acid may be used to manage DIC. ATRA helps blood cells develop, while anti-fibrinolytic agents prevent the breakdown of blood clots.

Progression or Complications

Disseminated Intravascular Coagulation can progress rapidly, leading to serious complications if not promptly treated. Here is an overview of the natural progression, common complications, and the impact of treatment:

Natural Progression:

DIC starts with an underlying condition triggering abnormal blood clotting throughout the body.
Initially, excessive clotting occurs, leading to blockages in blood vessels and reduced blood flow to organs.
As the condition progresses, the body's clotting factors and platelets are depleted, causing increased bleeding tendencies.
Without intervention, DIC can rapidly worsen, resulting in multiple organ failure and potentially death.

Complications:

Common complications of DIC include severe bleeding from various sites such as the skin, internal organs, or mucous membranes.
Organ damage due to reduced blood flow can lead to kidney failure, respiratory distress, and neurological issues including stroke.
In severe cases, DIC can result in shock, where vital organs do not receive enough blood and oxygen to function properly.

Impact of Treatment:

Early recognition and treatment are crucial to managing DIC effectively.
Treatment aims to address the underlying cause while stabilizing blood clotting and preventing excessive bleeding.
Medications may be used to regulate blood clotting factors and platelets.
Supportive care such as maintaining organ function and managing symptoms is essential.
The goal of treatment is to prevent further complications, slow down disease progression, and improve outcomes for individuals with DIC.