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Thromboembolism – Causes, Symptoms and Treatment

Thromboembolism occurs when a blood clot (thrombus) forms in a vessel, breaks loose, and blocks another vessel. It can be life-threatening and requires prompt medical attention.

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Things worth knowing about "Thromboembolism"

Thromboembolism occurs when a blood clot (thrombus) forms in a vessel, breaks loose, and blocks another vessel. It can be life-threatening and requires prompt medical attention.

What is Thromboembolism?

Thromboembolism is a condition in which a blood clot (thrombus) forms within a blood vessel, detaches partially or entirely, and travels through the bloodstream as an embolus until it becomes lodged in and obstructs a distant vessel. Depending on which vessel is affected, this can lead to serious organ damage or death. The most common forms are deep vein thrombosis (DVT) and pulmonary embolism (PE).

Causes and Risk Factors

The development of thromboembolism is classically explained by Virchow's triad, which identifies three contributing factors:

Slowed blood flow: caused by prolonged bed rest, immobility, heart failure, or long-haul flights
Vessel wall damage: due to injury, surgery, or atherosclerosis
Increased blood clotting tendency: resulting from genetic conditions (thrombophilia), hormone therapy, pregnancy, or cancer

Additional risk factors include obesity, smoking, advanced age, and a prior history of thrombosis.

Symptoms

Deep Vein Thrombosis

Swelling, pain, and redness, typically in one leg
Warmth in the affected limb
A feeling of tightness or heaviness in the calf or thigh

Pulmonary Embolism

Sudden onset of shortness of breath
Chest pain that worsens with breathing (pleuritic pain)
Rapid heart rate (tachycardia)
Coughing, sometimes with blood-tinged sputum
In severe cases: loss of consciousness and circulatory collapse

Other Forms

Arterial thromboembolism can cause a stroke (when brain arteries are blocked) or a heart attack (when coronary arteries are affected).

Diagnosis

Diagnostic workup depends on clinical suspicion and the affected vascular territory:

D-dimer test: A blood test that detects breakdown products of blood clots; a negative result can largely rule out thromboembolism
Compression ultrasonography: Imaging used to detect clots in the deep veins of the legs
CT pulmonary angiography (CTPA): The gold standard for diagnosing pulmonary embolism
Echocardiography: Used to assess cardiac strain in pulmonary embolism
MRI or conventional angiography: For suspected cerebral or peripheral arterial embolism

Treatment

Anticoagulation (Blood Thinners)

The primary treatment for thromboembolism is anticoagulation -- the use of medications to inhibit blood clotting. The goal is to prevent the clot from growing and to reduce the risk of new clots. Commonly used agents include:

Direct oral anticoagulants (DOACs) such as rivaroxaban or apixaban
Low molecular weight heparins (LMWH) such as enoxaparin for acute therapy
Vitamin K antagonists such as warfarin for long-term treatment

Thrombolysis

In life-threatening situations -- particularly in massive pulmonary embolism -- thrombolysis (pharmacological dissolution of the clot using agents such as alteplase) may be performed to rapidly restore blood flow.

Mechanical Procedures

In selected cases, surgical or minimally invasive catheter-based procedures may be used to physically remove the clot (thrombectomy).

Prevention

Preventive measures include the use of compression stockings, early mobilization after surgery, and prophylactic anticoagulation for high-risk patients.

References

Konstantinides S. V. et al. - 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism. European Heart Journal, 2020.
Kearon C. et al. - Antithrombotic Therapy for VTE Disease: CHEST Guideline and Expert Panel Report. Chest, 2016.
World Health Organization (WHO) - Cardiovascular diseases (CVDs): Key Facts. Geneva, 2021.

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