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Thromboembolic – Definition and Causes

Thromboembolic refers to conditions or events in which a blood clot (thrombus) blocks a blood vessel or breaks free and causes an embolism in another part of the body.

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Things worth knowing about "Thromboembolic"

Thromboembolic refers to conditions or events in which a blood clot (thrombus) blocks a blood vessel or breaks free and causes an embolism in another part of the body.

What does thromboembolic mean?

The term thromboembolic is a medical adjective used to describe anything related to the formation or consequences of a thrombus (blood clot) and the resulting embolism. A thrombus is a solid blood clot that forms inside a blood vessel. If the clot or part of it detaches, it becomes an embolus, which can travel through the bloodstream and block a vessel elsewhere in the body, causing a thromboembolic event.

Causes of thromboembolic events

Thromboembolic events arise from a combination of risk factors. The so-called Virchow triad describes the three fundamental causes:

Changes to the vessel wall: e.g. due to atherosclerosis, inflammation, or injury
Changes in blood flow: e.g. due to immobility, cardiac arrhythmias (particularly atrial fibrillation), or prolonged sitting
Changes in blood coagulation: e.g. due to genetic clotting disorders, pregnancy, use of hormonal contraceptives, or cancer

Additional risk factors include obesity, smoking, advanced age, surgery, and pre-existing heart conditions.

Types of thromboembolic conditions

Deep vein thrombosis (DVT)

Deep vein thrombosis occurs when a blood clot forms in the deep veins, most commonly in the legs or pelvis. It may cause swelling, pain, and redness, but can also be asymptomatic.

Pulmonary embolism

Pulmonary embolism is one of the most dangerous thromboembolic complications. It occurs when an embolus, typically originating from a deep vein thrombosis, blocks a blood vessel in the lungs. Symptoms include sudden shortness of breath, chest pain, and in severe cases, loss of consciousness or death.

Ischaemic stroke

An ischaemic stroke can have a thromboembolic origin when a blood clot blocks a cerebral vessel, depriving brain tissue of oxygen.

Myocardial infarction

A heart attack can also result from thromboembolic occlusion of the coronary arteries, often occurring on a background of atherosclerosis.

Symptoms of thromboembolic events

Symptoms depend on the location of the clot. Common signs may include:

Swelling, pain, or warmth in a leg (deep vein thrombosis)
Sudden shortness of breath, chest pain, rapid heartbeat (pulmonary embolism)
Sudden paralysis, speech difficulties, visual disturbances (stroke)
Chest pressure, pain radiating to the arm or jaw (heart attack)

If a thromboembolic event is suspected, immediate medical attention should be sought, as it may be a medical emergency.

Diagnosis

Thromboembolic events are diagnosed using a variety of investigations:

D-dimer test: A blood test that indicates elevated clotting activity
Ultrasound (duplex sonography): To visualise clots in the veins
CT angiography: Imaging used to identify vascular occlusions, e.g. in pulmonary embolism
MRI or CT of the brain: When stroke is suspected
ECG and cardiac enzymes: When myocardial infarction is suspected

Treatment of thromboembolic conditions

Anticoagulation

The cornerstone of treatment is anticoagulation, which involves inhibiting the clotting process with blood-thinning medications known as anticoagulants. These include heparin, direct oral anticoagulants (DOACs) such as rivaroxaban or apixaban, and the traditional vitamin K antagonist warfarin.

Thrombolysis

In serious cases such as massive pulmonary embolism or acute ischaemic stroke, thrombolysis (pharmacological dissolution of the clot) may be performed.

Thrombectomy

In selected cases, particularly in stroke treatment, the clot can be physically removed via mechanical thrombectomy (interventional clot retrieval).

Prophylaxis

Thromboembolism prophylaxis aims to prevent events before they occur. Measures include compression stockings, early mobilisation after surgery, and the prophylactic use of anticoagulants in high-risk patients.

References

Konstantinides, S. V. et al. - 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism. European Heart Journal, 41(4), 543-603 (2020).
Kearon, C. et al. - Antithrombotic Therapy for VTE Disease: CHEST Guideline and Expert Panel Report. Chest, 149(2), 315-352 (2016).
World Health Organization (WHO) - Cardiovascular diseases: Prevention and management of thromboembolism. WHO Technical Report (2021).

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