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Hypercoagulability – Causes, Symptoms & Treatment

Hypercoagulability refers to an increased tendency of the blood to clot, raising the risk of thrombosis and embolism. It can be inherited or acquired.

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Things worth knowing about "Hypercoagulability"

Hypercoagulability refers to an increased tendency of the blood to clot, raising the risk of thrombosis and embolism. It can be inherited or acquired.

What is Hypercoagulability?

Hypercoagulability (also known as a hypercoagulable state or thrombophilia) describes a condition in which the blood clots more readily or more extensively than normal. This increases the risk of unwanted blood clots (thrombi) forming inside blood vessels. These clots can obstruct blood flow and lead to life-threatening conditions such as deep vein thrombosis (DVT) or pulmonary embolism.

Causes

Hypercoagulability can be either inherited (primary) or acquired (secondary).

Inherited (Primary) Causes

Factor V Leiden mutation: One of the most common genetic causes; the clotting protein Factor V does not respond properly to anticoagulant signals.
Prothrombin gene mutation (G20210A): Leads to elevated levels of the clotting factor prothrombin in the blood.
Protein C or Protein S deficiency: These natural anticoagulants are reduced or dysfunctional.
Antithrombin III deficiency: Reduced levels of an important inhibitor of blood coagulation.

Acquired (Secondary) Causes

Antiphospholipid syndrome (an autoimmune condition producing pro-clotting antibodies)
Pregnancy and the postpartum period
Use of estrogen-containing contraceptives or hormone replacement therapy
Immobility or prolonged bed rest (e.g., after surgery or long-haul flights)
Cancer (malignancy)
Heart failure, nephrotic syndrome, inflammatory bowel disease
Smoking and severe obesity

Symptoms

Hypercoagulability itself often causes no direct symptoms. Signs typically appear only when a blood clot has already formed:

Deep vein thrombosis (DVT): Swelling, pain, redness, and warmth, usually in one leg
Pulmonary embolism: Sudden shortness of breath, chest pain, rapid heartbeat, coughing up blood
Stroke or TIA: Sudden weakness or paralysis, speech difficulties, vision problems
Heart attack: Chest pain radiating to the arm or jaw, sweating, nausea
Recurrent miscarriages (especially in antiphospholipid syndrome)

Diagnosis

Diagnosis is based on a combination of medical history, physical examination, and laboratory testing:

Blood count and coagulation tests (e.g., INR/PT, aPTT, D-dimers)
Genetic testing for Factor V Leiden, prothrombin mutation, and others
Measurement of Protein C, Protein S, and Antithrombin III levels
Antiphospholipid antibodies (e.g., lupus anticoagulant, anticardiolipin antibodies)
Imaging studies such as Doppler ultrasound or CT angiography when thrombosis is suspected

Treatment

Treatment depends on the underlying cause, the severity of the clotting disorder, and the individual risk profile of the patient:

Medication

Anticoagulants (blood thinners): Heparin (short-term, e.g., in hospital settings), vitamin K antagonists (e.g., warfarin), or direct oral anticoagulants (DOACs, e.g., rivaroxaban, apixaban)
Antiplatelet agents (e.g., aspirin) in selected clinical situations

General Measures

Compression stockings for venous thrombosis
Early mobilization after surgery
Weight reduction and smoking cessation
Adjustment of contraceptive method in patients with known thrombophilia

References

Middeldorp S. et al. - Thrombophilia: an update. Thrombosis and Haemostasis, 2021; 121(12):1547-1554. PubMed PMID: 34320655.
Lim W. - Antiphospholipid antibody syndrome. Hematology Am Soc Hematol Educ Program, 2009:233-239. PubMed PMID: 20008199.
Kasper D. L. et al. (Eds.) - Harrison's Principles of Internal Medicine, 21st Edition. McGraw-Hill, 2022.

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