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Medically Reviewed By:

2026-05-01

  • Condition
  • Venous
  • Severity: Emergency
Sudden arm swelling, pain, or bluish discoloration — particularly after exercise or repetitive upper-body activity — may indicate a blood clot in the arm vein. This requires urgent vascular evaluation within 24 hours. Call our office immediately at (941) 312-6196 or go to the emergency room.

Paget-Schroetter Syndrome

Also Known As: The large vein draining the arm
Paget-Schroetter syndrome, also called effort thrombosis or venous thoracic outlet syndrome, is deep vein thrombosis of the axillary-subclavian vein (the large vein draining the arm) caused by repetitive compression of the vein at the thoracic outlet. It primarily affects young, athletically active individuals — particularly overhead athletes such as swimmers, baseball pitchers, and weightlifters — and represents a surgical emergency if not treated promptly.


What Causes Paget-Schroetter Syndrome?

The thoracic outlet is the space between the collarbone, first rib, and surrounding muscle where major nerves and blood vessels pass from the neck into the arm. In some individuals — particularly those with an extra cervical rib, tight scalene muscles, or enlarged subclavius tendons — this space is abnormally narrow. Repetitive overhead arm movements compress the subclavian vein at this point, eventually causing the vein wall to scar and thrombose.

Symptoms of Paget-Schroetter Syndrome

The presentation is typically a young, active person with sudden onset of arm swelling, heaviness, and a bluish-purple (cyanotic) discoloration of the arm following intense upper-extremity activity. Visible prominent veins may appear over the shoulder and chest. The condition is often initially mistaken for a muscle injury.

Treatment of Paget-Schroetter Syndrome

Time-sensitive treatment is critical. Within 14 days of onset, catheter-directed thrombolysis is used to dissolve the clot and restore venous flow. This is followed by surgical decompression of the thoracic outlet — first rib resection and release of constricting fibrous bands via Arterial & Venous TOS Decompression — to eliminate the structural compression causing the problem. After decompression, venous stenting or balloon venoplasty may be performed if residual vein narrowing persists. Long-term anticoagulation is continued for a defined period after treatment.

SYMPTOMS

  • Sudden swelling of the arm after exercise or repetitive upper-body activity
  • Arm pain and heaviness
  • Bluish discoloration of the arm or hand
  • Distended veins visible on the shoulder, chest wall, or upper arm
  • Arm fatigue with continued use

DIAGNOSIS METHODS

  • Duplex Venous Ultrasound (Arm) +

    First-line imaging to confirm subclavian/axillary vein thrombosis.

  • MRI Venography +

    Detailed anatomy for TOS planning without radiation.

  • CT Venography +

    Defines extent of clot and venous anatomy for treatment planning.

  • Venography +

    Gold-standard for treatment planning and simultaneous catheter-directed thrombolysis.

TREATMENTS

RELATED CONDITIONS

FREQUENTLY ASKED QUESTIONS

  • Is Paget-Schroetter syndrome common in athletes? +

    It is the most common cause of upper-extremity DVT in young adults and athletes, but it remains relatively rare overall, accounting for approximately 2% of all DVT cases. Overhead athletes — swimmers, pitchers, volleyball players, and weightlifters — are at highest risk.

  • Can I return to sports after treatment? +

    Most patients successfully return to their sport after complete treatment — thrombolysis, decompression surgery, and anticoagulation. Recovery time is typically 2–4 months, depending on the extent of the clot and the surgical procedure.

  • What happens if Paget-Schroetter is not treated quickly? +

    Without timely thrombolysis, the clot organizes and becomes difficult or impossible to dissolve, leaving permanent scarring of the vein. This leads to chronic arm swelling, pain, and exercise intolerance — significantly impacting quality of life and athletic participation.