Venous Thromboembolism is an umbrella term covering two closely related clinical entities: deep vein thrombosis (DVT) and pulmonary embolism (PE). Together, they represent the third most common cardiovascular disease. The condition is characterized by the formation of a blood clot within the venous system, most frequently in the deep veins of the lower extremities, from where it may dislodge and travel through the venous circulation into the pulmonary arteries. Venous thromboembolism can affect patients across all age groups and is associated with a wide range of risk factors, including immobilization, surgical procedures, malignancy, and inherited thrombophilic disorders.

Core Diagnostic Methods

Clinical assessment and validated scoring systems constitute the first step in the diagnostic algorithm. Tools such as the Wells score are used to estimate the pre-test probability of disease and determine whether further imaging is warranted. Clinical signs of DVT include limb swelling, erythema, and pain, whereas pulmonary embolism typically presents with sudden-onset dyspnea, chest pain, or hemoptysis.

D-dimer testing is a laboratory assay that detects fibrin degradation products in the blood. It has high sensitivity, meaning that a negative result in a patient with low clinical probability effectively excludes venous thromboembolism without the need for imaging. However, a positive result is non-specific and must be followed by diagnostic imaging.

Compression ultrasonography is the first-line imaging modality for suspected deep vein thrombosis. It evaluates the venous system of the upper or lower extremities, and lack of venous compressibility is a key indicator of thrombus presence. The method is widely available, non-invasive, and free of radiation exposure, making it suitable for repeated use and follow-up.

CT pulmonary angiography (CTPA) is the gold standard for diagnosing pulmonary embolism. It enables direct visualization of thrombi within the pulmonary arterial system, assessment of clot burden, and evaluation of right ventricular strain. It can also identify alternative causes of symptoms, such as pneumonia or pleural effusion.

Echocardiography is used to assess right ventricular function and the hemodynamic severity of pulmonary embolism. In hemodynamically unstable patients where CT imaging is not feasible, findings such as right ventricular dilation or intracardiac thrombus can support the diagnosis and facilitate rapid treatment initiation.

Key Procedures

Anticoagulation therapy is the cornerstone of venous thromboembolism treatment. Its goal is to prevent thrombus extension, embolization, and recurrence. Acute treatment typically involves low-molecular-weight heparins, unfractionated heparin, or direct oral anticoagulants, followed by long-term oral anticoagulation. Treatment duration depends on the nature of the event, underlying risk factors, and individual bleeding risk.

Systemic thrombolysis involves intravenous administration of thrombolytic agents that dissolve clots by activating plasminogen. It is reserved for hemodynamically unstable patients with massive pulmonary embolism that is immediately life-threatening and unresponsive to conservative therapy. Due to a higher risk of bleeding complications, indications must be carefully considered.

Catheter-directed thrombolysis and mechanical thrombectomy are interventional procedures in which thrombolytic agents are delivered directly into the clot via a catheter placed in the pulmonary arteries or deep veins. Localized delivery allows for effective clot dissolution with lower systemic drug exposure, reducing bleeding risk. Mechanical thrombectomy physically removes the thrombus using aspiration or fragmentation systems.

Inferior vena cava filter placement involves inserting a device into the inferior vena cava to capture embolizing thrombi from the lower extremities before they reach the pulmonary circulation. It is indicated in patients with confirmed DVT who have contraindications to anticoagulation or in whom anticoagulation has failed. Modern filters are typically retrievable and are removed once anticoagulation can be safely initiated.

Compression therapy using elastic stockings or bandages reduces venous hypertension in the affected limb, alleviates swelling, and helps prevent post-thrombotic syndrome. Post-thrombotic syndrome is a chronic complication of DVT characterized by persistent swelling, pain, and skin changes. Compression therapy is an essential component of long-term management following venous thromboembolism.

For Venous Trhromboembolism, we provide

• Extraction/aspiration system for mechanical thrombectomy in the treatment of pulmonary embolism
• Mechanical thrombectomy system for the treatment of deep vein thrombosis