Paget Schroetter Syndrome (Paget Von Schrotter Disease)


Article Author:
Taimur Saleem


Article Editor:
Donald Baril


Editors In Chief:
Amie Kim
Todd May
Matthew Varacallo


Managing Editors:
Orawan Chaigasame
Carrie Smith
Abdul Waheed
Frank Smeeks
Kristina Soman-Faulkner
Benjamin Eovaldi
Radia Jamil
Sobhan Daneshfar
Saad Nazir
William Gossman
Pritesh Sheth
Hassam Zulfiqar
Steve Bhimji
John Shell
Matthew Varacallo
Ahmad Malik
Mark Pellegrini
James Hughes
Beata Beatty
Hajira Basit
Phillip Hynes


Updated:
3/3/2019 9:33:34 AM

Introduction

Paget Schroetter syndrome (PSS) is effort-induced thrombosis of the axillary and subclavian veins associated with compression of the subclavian vein at the thoracic outlet. It is the venous variant of thoracic outlet syndrome (TOS), the syndrome of symptoms associated with compression of the subclavian vein, subclavian artery or brachial plexus as they pass through the thoracic outlet. The description of this entity dates back to 1875 when Sir James Paget reported a case of spontaneous thrombosis of the subclavian vein in a patient. In 1884, von Schroetter hypothesized that the condition was a consequence of injury to the vein from repetitive musculoskeletal motion. [1][2][3][4][5]

Etiology

The subclavian vein travels in the proximity of the clavicle, first rib, anterior scalene and subclavius muscles. PSS is related to the compression and subsequent thrombosis of the subclavian vein due to these structures.

Epidemiology

PSS is more commonly seen in younger patients (in their 20s and 30s) with a male to female ratio of 2:1. Often these patients will not have any other significant medical comorbidities. The incidence ranges from 1 to 2 per 100,000 individuals per year in various studies. It is more commonly encountered on the right side. Venous TOS is less common than neurogenic TOS but more common than arterial TOS. Often affected individuals with PSS will be athletes, specifically, those engaged in the repetitive over-the-head motion of their arms, including baseball or softball pitchers, swimmers, rowers, or weightlifters.

Pathophysiology

Repetitive strain from vigorous physical activity and compression of the subclavian vein from adjacent anatomic structures leads to venous injury and subsequent thrombosis. This impedes the venous return from the affected extremity leading to edema. Over time, the body forms collaterals to bypass the venous obstruction. In the chronic phase, the vein becomes fibrotic. Surrounding inflammatory changes from the thrombosis lead to scar tissue formation.[6][7][8][9]

History and Physical

Patients may present with upper extremity swelling and pain. The presentation of these symptoms can be acute, subacute or chronic. For the onset of symptoms in PSS, a history of an antecedent strenuous exercise can usually be elicited from the patients. On examination, the upper extremity will demonstrate edema with an enlarged girth of the extremity compared to the contralateral side. The upper extremity may be tense and cyanotic. Additionally, venous collaterals may be seen on the chest and around the shoulder (Urschel’s sign).

Evaluation

A convenient non-invasive first test is ultrasonography of the upper extremities. This will demonstrate thrombus in the deep venous system. Acute thrombus will be non-compressible on ultrasound. Additionally, it will be echogenic with a distended appearance of the vein and absent spectral/color flow. A vein with chronic thrombus will have an irregular and more collapsed appearance with the development of collaterals on ultrasound. Ultrasonography will not allow for complete demonstration of the central veins. CT venography and MR venography can demonstrate thrombus in the venous system as well. Contrast venography is a more invasive test that can demonstrate patency of the central venous system. Laboratory workup includes thrombophilia panel (protein C and S levels, antithrombin levels, prothrombin gene mutation analysis, factor V Leiden mutation testing, among others) and D-dimer levels. D-dimer levels will be elevated in a patient with deep venous thrombosis; however, this elevation can also be seen in other infectious, inflammatory, and physiologic conditions. If the patients have any symptoms concerning for a pulmonary embolism, a CTA thorax with pulmonary embolism protocol should be obtained. Alternatively, a ventilation-perfusion study can diagnose pulmonary embolism as well, but CTA thorax remains the study of choice.

Treatment / Management

PSS is a deep venous thrombosis, and, as such, the first step in the management is to initiate anticoagulation therapy, typically, via an intravenous heparin drip. Patients are given an initial bolus of intravenous (IV) heparin and then kept on a maintenance IV heparin drip. The dose of the bolus and maintenance heparin drip is weight based. The IV heparin drip is titrated according to APTT levels or factor X levels. The affected extremity should be elevated to mitigate edema. If the patients present within 2 weeks of the onset of symptoms, it is reasonable to consider a venogram and catheter-directed thrombolysis to reduce the clot burden. Under fluoroscopic guidance, a lysis catheter (such as Cragg-McNamara infusion catheter) is placed to drip a thrombolytic agent such as alteplase for 24 to 48 hours. Alternatively, a pharmacomechanical thrombectomy system such as Angiojet (Boston Scientific) or Ekosonic system (BTG) can be used. When using alteplase, the fibrinogen levels should be monitored closely to direct the dosing and duration of the catheter-directed lysis. When using pharmacomechanical thrombectomy, one should be mindful of the risk of acute kidney injury associated with hemolysis. If the presentation is more than 2 to 4 weeks from the onset of symptoms, heparinization alone may be initiated without thrombolytic therapy as the success of thrombolytic therapy is low beyond that window of time. [10][11][12]

Decompression of the thoracic outlet is the definitive management of PSS. This usually includes a first rib resection with some or all of the following procedures: anterior scalenectomy, resection of subclavius muscle, resection of costoclavicular ligament and lysis of scar tissue/adhesions surrounding the subclavian vein. Venoplasty and/or stenting without decompression will not produce favorable results. The surgical approach can either be transaxillary or supra, infra, or para-clavicular. The timing of decompression after thrombolytic therapy is widely debated. The role of long-term anticoagulation in these patients after adequate decompression remains unclear. We perform a venogram, often with intravascular ultrasound, 2 weeks postoperatively and decide about the duration of anticoagulation at that time. At this setting, venoplasty can be used for any residual stenosis since decompression has been achieved surgically. Use of stents is discouraged in this anatomic location due to the repetitive motion and risk of stent fracture and thrombosis.

Duration of anticoagulation in patients with underlying hypercoagulability disorders after decompression also remains unclear. In most patients, anticoagulation for 3 to 6 months following an episode of deep venous thrombosis such as PSS is reasonable. This can be achieved either via Coumadin or direct oral anticoagulants (DOAC). In the case of recurrent thrombosis after decompression surgery, thrombolysis and venography are usually attempted again with the maintenance of long-term anticoagulation therapy afterward. In some patients with PSS, chronic total occlusion of the subclavian vein may persist despite adequate decompression maneuvers. Depending on the severity of the symptoms, venous reconstruction should be considered. This can be achieved with a bypass or jugular vein turndown procedure (with or without medial claviculectomy).

Differential Diagnosis

Upper extremity is swelling may be present in patients with lymphatic disorders or systemic conditions such as end-stage renal disease and congestive heart failure. Upper extremity deep venous thrombosis can be seen with indwelling catheters as well.

Prognosis

A combination of thrombolysis and thoracic outlet decompression may be successful in up to 90% of the patients. Anticoagulation with decompression is less successful than thrombolysis and decompression but still yields better results than anticoagulation alone.

Enhancing Healthcare Team Outcomes

The diagnosis and management of PSS is with a multidisciplinary team that consists of a primary care provider, nurse practitioner, sports physician, vascular surgeon, and radiologist. Patients with venous obstruction do need treatment or the arm will remain swollen and painful. After anticoagulation, decompression of the thoracic outlet is often required. Most patients do have a good outcome with treatment but depending on the state of the subclavian vein, some degree of arm swelling may persist. Today, for some cases of PSS, endovascular therapy is available.[13]


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Paget Schroetter Syndrome (Paget Von Schrotter Disease) - Questions

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A 17-year-old baseball player presents with an acute swelling of the left arm after a game. He has not experienced similar symptoms in the past. What is the first diagnostic test in the workup of this patient?



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A 19-year-old athlete presents with swelling of the right arm that began after lifting heavy weights. The symptoms started 3 days ago and have progressively worsened. Ultrasound is performed showing occlusive thrombus in the subclavian vein. What is the best next step in the management?



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A 32-year-old athlete presented with thrombosis of the subclavian vein. He underwent catheter-directed thrombolysis followed by first rib resection and anterior scalene muscle resection. Symptom relief can be expected in what percentage of patients undergoing this treatment regime?



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A 28-year-old athlete presented with occlusive thrombosis of the left axillo-subclavian veins. Symptoms began 4 weeks ago. He is anticoagulated and then undergoes a first rib resection. His thrombophilia panel is negative. For what duration of time in the long term should he be anticoagulated?



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A 36-year-old patient presents with intermittent left arm swelling. On abduction, significant compression of the subclavian vein is noted on ultrasound. What clinical entity does this patient have?



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Paget Schroetter Syndrome (Paget Von Schrotter Disease) - References

References

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