NBA Rookie Sensation Wembanyama's Deep Vein Thrombosis: A Complete Guide to DVT

Venous thromboembolism (VTE) refers to a blood clot (thrombus) forming inside a vein. It includes deep vein thrombosis (DVT), which occurs in the deep veins of the limbs (especially the legs and pelvis), and pulmonary embolism (PE), where a DVT clot breaks free and travels to the lungs, blocking blood flow. VTE can restrict venous return and cause swelling and pain, most often in the lower limbs, though it can also occur in the upper limbs, particularly as so-called effort thrombosis.

Symptoms include leg pain or tenderness, or a sensation of persistent cramping that cannot be relieved by icing, stretching, or painkillers. Inactivity may worsen the pain while movement may ease it. There may be red or blue skin discoloration (often noticeable when bathing in warm water), warmth to the touch over the leg, and unexplained swelling of the upper arm or neck (upper-extremity deep vein thrombosis).

Epidemiology

• About 900,000 people develop VTE each year in the United States, with an incidence of 1 to 2 per 1,000.
• About 60,000 to 100,000 people die from VTE each year.
• Risk increases with age, and is higher in men than in women.
• Data on the incidence of VTE in athletes are currently limited.

Etiology and Pathogenesis

• Virchow’s triad:
  • Venous stasis (prolonged immobility, compression)
  • Vessel wall injury (sports trauma, surgery)
  • Hypercoagulable state (inherited clotting disorders)
• Genetic factors:
  • Factor V Leiden mutation
  • Protein C, protein S, or antithrombin III deficiency
  • Prothrombin mutation
  • Non-O blood type

Risk Factors

• Increasing age
• Malignancy
• Antiphospholipid syndrome
• Estrogen therapy (such as oral contraceptives)
• Pregnancy and the postpartum period
• Personal or family history of VTE
• Obesity
• Autoimmune and chronic inflammatory diseases
• Surgery, trauma, fractures
• Prolonged travel (over 4 hours)
• Sport-related factors:
  • Long-distance travel (such as competition travel)
  • Direct tissue trauma (such as sports injuries)
  • Some case reports suggest athletes may have a higher VTE risk

Preventive measures

• Avoid prolonged immobility
• Avoid excessive intake of caffeinated drinks and alcohol
• Stay hydrated and replenish electrolytes during and after training
• Wear compression stockings during long periods of sitting still
• When taking contraceptives, choose a low-dose estrogen type
• Prophylactic anticoagulation may be considered for hospitalized patients

Diagnostic Criteria

1. Deep vein thrombosis (DVT) diagnostic criteria — Wells Criteria

• Active cancer (currently treated, treated within 6 months, or on palliative care): +1
• Paralysis, paresis, or recent plaster immobilization of the leg: +1
• Recently bedridden for 3 days or more, or major surgery within 12 weeks requiring general or regional anesthesia: +1
• Localized tenderness along the distribution of the deep venous system: +1
• Entire leg swollen: +1
• Calf swelling (at least 3 cm larger than the asymptomatic side): +1
• Pitting edema confined to the symptomatic leg: +1
• Collateral superficial vein dilation (non-varicose): +1
• Previously documented deep vein thrombosis (DVT): +1
• An alternative diagnosis at least as likely as DVT: -2

Total score interpretation

• Total score of 1 or less: DVT unlikely (low risk)
• Total score of 2 or more: DVT likely (high risk)

2. Pulmonary embolism (PE) diagnostic criteria — Wells Criteria

• Clinical signs of deep vein thrombosis (DVT) (at least leg swelling and deep vein tenderness): +3
• No alternative diagnosis more likely than pulmonary embolism (PE): +3
• Heart rate over 100 beats per minute: +1.5
• Prolonged immobility (more than 3 days) or surgery within 4 weeks: +1.5
• Previous history of deep vein thrombosis (DVT) or pulmonary embolism (PE): +1.5
• Haemoptysis: +1
• Malignancy (currently treated, treated within 6 months, or on palliative care): +1

Total score interpretation

• Total score of 4 or less: PE unlikely (low risk)
• Total score over 4: PE likely (high risk)

Diagnosis

Diagnosis usually requires a combination of clinical assessment, laboratory tests, and imaging tools.

1. Deep vein thrombosis (DVT)

• Clinical assessment:
  • Use the Wells score
  • D-dimer testing:
    • A negative result can almost rule out DVT (but only in low-risk patients)
    • A positive result requires further imaging
• Imaging:
  • Venous ultrasound (Doppler ultrasound): the first-line test, with a sensitivity of 90 to 95 percent, particularly useful for femoral or popliteal vein thrombosis
  • Venography: used less often, but still the gold standard, and useful in difficult-to-diagnose cases
  • MR venography: useful for patients suspected of iliac vein thrombosis or upper-limb thrombosis

2. Pulmonary embolism (PE)

• Clinical assessment:
  • Use the Wells score for PE
  • D-dimer testing (for low-risk patients)
• Imaging:
  • CT pulmonary angiography (CTPA): the first-line test, which clearly shows clots within the pulmonary vessels.
  • Ventilation/perfusion (V/Q) scan: useful for patients with poor renal function or iodine contrast allergy.
  • Echocardiography: can be used for patients with suspected severe PE who cannot undergo CT, showing right ventricular dilation and elevated pulmonary artery pressure.

Treatment

• Acute-phase treatment
  • Immediate anticoagulation:
    • First choice: factor Xa inhibitors (such as rivaroxaban, apixaban) or a direct thrombin inhibitor (such as dabigatran)
    • Low-molecular-weight heparin (LMWH) can be used when factor Xa inhibitors are unavailable or for other considerations
    • Warfarin is a last resort because it requires frequent INR monitoring
  • Treatment duration:
    • Transient (reversible) provoking factor: 3 months
    • First VTE with no clear provoking factor: reassess whether to continue anticoagulation after 3 months
    • High bleeding risk: 3 months
    • Low to moderate bleeding risk: long-term anticoagulation may be considered
• Special populations:
  • Athletes: to avoid disrupting training, oral factor Xa inhibitors are often chosen because of their short half-life and lack of need for frequent monitoring
  • Pregnant women: choose low-molecular-weight heparin (LMWH), and avoid warfarin (which is teratogenic)
  • Patients with poor renal function: avoid dabigatran, which is mainly cleared by the kidneys

Thrombolysis and interventional treatment

• Used for high-risk PE or severe DVT (such as limb ischemia)
• Methods:
  • Systemic thrombolysis: using tPA (such as alteplase), for patients with low blood pressure or life-threatening conditions.
  • Catheter-directed thrombolysis (CDT): for severe DVT, delivering the thrombolytic drug directly to the clot.
  • Inferior vena cava (IVC) filter: for patients with contraindications to anticoagulation, such as those with recent major bleeding.

Athlete Rehabilitation and Return to Sport

• In the past, VTE treatment emphasized rest; now early activity is recommended when it is safe.
• A gradual return to sport is recommended:
  • Weeks 1-3: resume daily activities
  • Week 4: non-weight-bearing exercise (such as swimming)
  • Week 5: low-impact exercise (such as cycling)
  • Week 6: gradually resume impact activity (such as running)
  • After week 6: progressively increase training volume
• Contact sports are prohibited during anticoagulation to avoid the risk of serious bleeding.

Effects of anticoagulation on exercise

• Main risk: bleeding
  • Contact sports (such as boxing, rugby) should be avoided
  • Endurance sports (such as running, swimming) are relatively safe
• Adjusting the medication strategy:
  • A brief pause in medication may be considered during competition (based on a physician’s assessment)
  • Choose a drug with a shorter half-life (such as rivaroxaban)

Long-Term Follow-Up and Prognosis

• If DVT is left untreated, 50 percent progress to pulmonary embolism.
• DVT caused by a thrombophilic disorder carries a higher recurrence risk.
• Patients should avoid prolonged sitting, and during travel should move regularly and wear loose clothing.
• Prognosis and long-term management:
  • If DVT is left untreated, 50 percent progress to PE.
  • 30 to 50 percent of patients develop post-thrombotic syndrome (PTS):
    • Symptoms: chronic edema, varicose veins, skin discoloration
    • Prevention: compression stockings, appropriate activity
• Long-term recurrence risk in VTE patients:
  • Low-risk patients (such as VTE after short-term surgery): recurrence rate under 3 percent per year after stopping medication
  • High-risk patients (such as those with genetic mutations): recurrence rate of 8 to 10 percent per year, possibly requiring lifelong anticoagulation

Summary

Athletes are at risk of VTE, especially after prolonged travel or trauma. Anticoagulation with a factor Xa inhibitor (such as rivaroxaban) is commonly used in athletes to reduce disruption to training, and contact sports should be avoided during anticoagulation to reduce bleeding risk.

Appropriate exercise may help lower VTE recurrence, but it should be progressive. Long-term follow-up is especially important for high-risk patients (such as those with inherited clotting disorders). Athletes should work closely with a physician to develop an individualized treatment and exercise-recovery plan, ensuring a safe return to competition and training.

This article is general medical health education and does not replace a physician’s examination or assessment. The actual management and whether to seek care depend on your condition and a physician’s assessment.

References

• Sports Med. 2015 Oct;45(10):1365-72.
• Blood Rev. 2021 May:47:100780.
• Venous Thromboembolism and Marathon Athletes. https://doi.org/10.1161/CIRCULATIONAHA.113.004586

Further reading

• Sports Injury Overview
• PRP Prolotherapy
• Rehabilitation Exercise Prescription
• Pain Management