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Blood Coagulation – Function, Disorders & Treatment

Blood coagulation is a vital process that seals wounds and prevents excessive blood loss. Disorders can lead to thrombosis or uncontrolled bleeding.

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Things worth knowing about "Blood Coagulation"

Blood coagulation is a vital process that seals wounds and prevents excessive blood loss. Disorders can lead to thrombosis or uncontrolled bleeding.

What is Blood Coagulation?

Blood coagulation (also called hemostasis or blood clotting) is a complex biological process through which the body stops bleeding and seals wounds. When a blood vessel is injured, a cascade of biochemical reactions is triggered, resulting in the formation of a stable blood clot. This clot seals the site of injury and allows wound healing to take place.

How Does Blood Coagulation Work?

The coagulation process occurs in several successive steps, collectively known as the coagulation cascade:

1. Primary Hemostasis

Following a vascular injury, the affected blood vessel first narrows (vasoconstriction) to reduce blood flow. At the same time, platelets (thrombocytes) adhere to the damaged vessel wall and form an initial, unstable plug.

2. Secondary Hemostasis (Coagulation Cascade)

In secondary hemostasis, the platelet plug is reinforced by a mesh of fibrin. This process is regulated by clotting factors (proteins in the blood, numbered I to XIII). The cascade can be triggered by two pathways:

Extrinsic pathway: Activated by tissue factors released during injury.
Intrinsic pathway: Activated by contact of blood with damaged vessel walls.

Both pathways converge into a common final pathway that leads to the formation of thrombin. Thrombin converts the soluble protein fibrinogen into insoluble fibrin, which stabilizes the clot.

3. Fibrinolysis

After wound healing, the clot is dissolved through a process called fibrinolysis. The enzyme plasmin breaks down the fibrin network, restoring normal blood flow.

Disorders of Blood Coagulation

Coagulation disorders can occur in two directions:

Increased Clotting Tendency (Thrombophilia)

An excessive tendency to clot can lead to the formation of unwanted blood clots (thromboses). These can block blood vessels and cause life-threatening conditions such as pulmonary embolism or stroke. Causes may be genetic (e.g., Factor V Leiden mutation) or triggered by external factors such as physical inactivity, obesity, or certain medications.

Reduced Clotting Ability (Bleeding Tendency)

Insufficient clotting ability leads to prolonged or uncontrolled bleeding. Well-known conditions include:

Hemophilia A and B: Hereditary conditions in which specific clotting factors are absent or deficient.
Von Willebrand disease: The most common inherited bleeding disorder.
Thrombocytopenia: An abnormally low platelet count.

Diagnosis of Coagulation Disorders

Several laboratory tests are available to assess blood clotting:

Prothrombin time (PT) / INR: Measures the activity of the extrinsic coagulation pathway; used to monitor patients on anticoagulant therapy.
aPTT (Activated Partial Thromboplastin Time): Evaluates the intrinsic coagulation pathway.
Platelet count: Indicates the number of platelets in the blood.
D-dimer: Signals increased fibrin breakdown; used when thrombosis or pulmonary embolism is suspected.

Medications and Blood Coagulation

Various medications specifically influence blood coagulation:

Anticoagulants (blood thinners): Such as heparin, warfarin, or direct oral anticoagulants (DOACs) inhibit the coagulation cascade and are used to prevent and treat thrombosis.
Antiplatelet agents: Such as acetylsalicylic acid (aspirin) or clopidogrel prevent platelet aggregation and are used, for example, after a heart attack.
Thrombolytics: Dissolve existing blood clots (e.g., in acute stroke or myocardial infarction).

When to See a Doctor?

The following symptoms may indicate a coagulation disorder and should be evaluated by a physician:

Frequent or unusually heavy bleeding (e.g., after minor injuries or nosebleeds)
Unexplained bruising
Swelling, pain, or redness in a leg (possible thrombosis)
Sudden shortness of breath or chest pain (possible pulmonary embolism)

References

Pschyrembel Clinical Dictionary, 268th edition, De Gruyter, Berlin (2020).
World Health Organization (WHO): Haemostasis and Thrombosis. Available at: https://www.who.int
Levi M, Ten Cate H. Disseminated intravascular coagulation. New England Journal of Medicine, 341(8):586-592 (1999). https://doi.org/10.1056/NEJM199908193410807

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