Subclavian Vein Thrombosis

Updated: December 9, 2025

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Background

In the subclavian vein, a main vein that drains blood from the upper limb toward the heart, a blood clot (thrombus) form.

The artery is located both superiorly and posteriorly to the subclavian vein, which runs over the first rib and behind the clavicle.

Subclavian vein thrombosis was initially reported by Sir James Paget in 1875. He named the spontaneous thrombosis of the veins draining the upper extremities “gouty phlebitis.”

Paget observed that the injured extremity swelled and hurt, but he mistakenly thought that the phenomenon was caused by vasospasm.

This syndrome, according to von Schrötter’s 1884 theory, was caused by occlusive thrombosis of the axillary and subclavian veins.

Hughes created the term Paget-von Schrötter syndrome in 1949 to honor the efforts of these pioneers. Indwelling catheters can cause thrombosis of the subclavian vein, which is a similar disease.

Due to the widespread use of central venous catheters (CVCs) in patients with cancer, renal failure, and other chronic medical illnesses, the incidence of this disorder has significantly increased over the past 20 years.

Epidemiology

Axillary or subclavian vein thrombosis made about 1-2% of all deep vein thrombosis (DVT) cases prior to 1967.

Due to the increased use of central venous access for a variety of clinical problems the incidence has increased.

The dominant arm is where thrombosis occurs in 80% of patients with subclavian vein stenosis and effort-induced thrombosis.

Between 4% and 10% of all cases of deep vein thrombosis (DVT) are caused by UEDVT. The subclavian vein is one of the most impacted areas in UEDVT patients.

According to estimates, there are 1 to 2 cases of primary (effort-related) SVT per 100,000 persons each year mostly in young active people.

Anatomy

Pathophysiology

The internal jugular vein and femoral vein appear to have comparable thrombotic problems in hemodialysis patients.

Due to the extremely high risk of thrombosis, the subclavian vein should be avoided for both short-term and long-term hemodialysis.

This condition was dubbed “effort-induced thrombosis” in the 1960s to recognize that it occurs after exceptionally demanding usage of the afflicted side’s arm or shoulder.

It has been proposed that external compression of the axillary-subclavian vein plays a role in the blood stasis that causes thrombosis.

The subclavian vein’s venous flow is changed, and turbulence is increased when catheters and transvenous pacemakers are inserted.

It has documented that parenteral feeding and intravenous (IV) drugs can induce thrombophlebitis.

Etiology

Primary SVT

Secondary SVT

Repetitive Upper Limb Activity

Central Venous Catheters

Pacemaker or Implantable Cardioverter-Defibrillator (ICD) Leads

Malignancy

Hypercoagulable States

Genetics

Prognostic Factors

The case fatality rate for untreated ASVT-related PE can reach 10%, which is like the rate for lower extremity PE.

Venous occlusion has long-term effects that include significant morbidity associated with chronic discomfort and swelling.

Physical activity that involves prolonged use of the afflicted arm might aggravate these sensations.

There is growing proof that endovascular procedures are the preferred treatment option for patients with upper-extremity thrombosis because of advancements in this technology.

This method facilitates a far quicker recovery and, over time, results in lower morbidity and fewer problem

Clinical History

A history of trauma or, more commonly, excessive arm use (>50% of cases) may be mentioned by patients. Frequently occurring triggering actions include backward and downward rotation of the shoulder or repetitive hyperabduction and external rotation of the arm.

Most patients arrive to the emergency department (ED) within 24 hours due to the relatively significant symptoms of subclavian stenosis.

Similar symptoms linked with the indwelling catheter in the ipsilateral arm or shoulder are reported by patients with catheter-related axillary-subclavian vein thrombosis (ASVT).

Physical Examination

Palpation

Functional Tests

Systemic Examination

Age group

Associated comorbidity

Associated activity

Acuity of presentation

Acute symptoms are:

Swelling, pain or discomfort, Cyanosis or reddish discoloration of the arm, hand, or shoulder

Chronic symptoms are:

Sense of heaviness, tightness, or fatigue in the affected limb

Differential Diagnoses

Antiphospholipid Syndrome

Lymphedema

Pancoast Syndrome

Cellulitis

Superior Vena Cava Syndrome

Laboratory Studies

Imaging Studies

Procedures

Histologic Findings

Staging

Treatment Paradigm

Thrombolytic treatment is advised for patients whose effort-induced vein thrombosis has lasted less than two weeks.

Warfarin is a conservative treatment for chronic axillary-subclavian vein thrombosis (ASVT), and surgical bypass is an option if symptoms are severe.

Conservative care is the first line of treatment for subclavian vein thrombosis. This includes rest, limb elevation, and the use of warm compresses or heat.

Physical therapy is the initial treatment for a small number of individuals with no anatomic abnormalities and few symptoms.

Weight loss and adhesion release at the blockage site are two benefits of structured physical therapy.

Treatment approaches for Paget-von Schrötter syndrome and catheter-induced subclavian vein thrombosis differ based on their distinct natural history.

Thrombolytic therapy is favoured over thrombectomy due to the absence of surgical risks and the potential for an intimal tear caused by the embolectomy catheter.

The elimination of urokinase from the US market compelled interventional radiologists to use tissue plasminogen activator (tPA) in less clinically defined regimens.

Patients with catheter-associated subclavian thrombosis frequently have substantial comorbidity, care must be taken when choosing which individuals should receive thrombolytic therapy.

by Stage

by Modality

Chemotherapy

Radiation Therapy

Surgical Interventions

Hormone Therapy

Immunotherapy

Hyperthermia

Photodynamic Therapy

Stem Cell Transplant

Targeted Therapy

Palliative Care

use-of-non-pharmacological-approach-for-subclavian-vein-thrombosi

Adjust workstations or exercise regimens to reduce repeated or extended overhead activities.

The thoracic outlet region should not be compressed, thus adjust desk and seating height.

Frequent pauses are necessary to prevent extended strain on the upper limb muscles.

Minimize endothelial damage by using ultrasound guidance when inserting a pacemaker or central venous catheter.

For patients with persistent venous insufficiency or residual swelling, graduated compression sleeves can help relieve venous congestion.

Proper awareness about SVT should be provided and its related causes with management strategies.

Appointments with specialists and preventing recurrence of disorder is an ongoing life-long effort.

Use of Anticoagulating agent

Warfarin:

It lowers the synthesis of active clotting factors and depletes functional vitamin K stores.

Heparin:

It accelerates the rate at which antithrombin neutralizes specific active coagulation factors.

use-of-intervention-with-a-procedure-in-treating-subclavian-vein-thrombosis

Anatomic abnormalities include congenital fibromuscular bands, shortening of the costoclavicular space due to shoulder depression, or abnormal subclavius or scalenus anterior.

Endoluminal stent placement to avoid stent breakage due to compression against the first rib.

use-of-phases-in-managing-subclavian-vein-thrombosis

In acute phase management, the goal is to prevent thrombus extension and reduce symptoms.

In subacute phase management, the goal is to prevent recurrence and promote clot resolution.

In supportive care and management phase, patients should receive required attention such as lifestyle modification and surgical interventional procedures.

The regular follow-up visits with the specialist are scheduled to check the improvement of patients along with treatment response.

Medication

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Subclavian Vein Thrombosis

Updated : December 9, 2025

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In the subclavian vein, a main vein that drains blood from the upper limb toward the heart, a blood clot (thrombus) form.

The artery is located both superiorly and posteriorly to the subclavian vein, which runs over the first rib and behind the clavicle.

Subclavian vein thrombosis was initially reported by Sir James Paget in 1875. He named the spontaneous thrombosis of the veins draining the upper extremities “gouty phlebitis.”

Paget observed that the injured extremity swelled and hurt, but he mistakenly thought that the phenomenon was caused by vasospasm.

This syndrome, according to von Schrötter’s 1884 theory, was caused by occlusive thrombosis of the axillary and subclavian veins.

Hughes created the term Paget-von Schrötter syndrome in 1949 to honor the efforts of these pioneers. Indwelling catheters can cause thrombosis of the subclavian vein, which is a similar disease.

Due to the widespread use of central venous catheters (CVCs) in patients with cancer, renal failure, and other chronic medical illnesses, the incidence of this disorder has significantly increased over the past 20 years.

Axillary or subclavian vein thrombosis made about 1-2% of all deep vein thrombosis (DVT) cases prior to 1967.

Due to the increased use of central venous access for a variety of clinical problems the incidence has increased.

The dominant arm is where thrombosis occurs in 80% of patients with subclavian vein stenosis and effort-induced thrombosis.

Between 4% and 10% of all cases of deep vein thrombosis (DVT) are caused by UEDVT. The subclavian vein is one of the most impacted areas in UEDVT patients.

According to estimates, there are 1 to 2 cases of primary (effort-related) SVT per 100,000 persons each year mostly in young active people.

The internal jugular vein and femoral vein appear to have comparable thrombotic problems in hemodialysis patients.

Due to the extremely high risk of thrombosis, the subclavian vein should be avoided for both short-term and long-term hemodialysis.

This condition was dubbed “effort-induced thrombosis” in the 1960s to recognize that it occurs after exceptionally demanding usage of the afflicted side’s arm or shoulder.

It has been proposed that external compression of the axillary-subclavian vein plays a role in the blood stasis that causes thrombosis.

The subclavian vein’s venous flow is changed, and turbulence is increased when catheters and transvenous pacemakers are inserted.

It has documented that parenteral feeding and intravenous (IV) drugs can induce thrombophlebitis.

Primary SVT

Secondary SVT

Repetitive Upper Limb Activity

Central Venous Catheters

Pacemaker or Implantable Cardioverter-Defibrillator (ICD) Leads

Malignancy

Hypercoagulable States

The case fatality rate for untreated ASVT-related PE can reach 10%, which is like the rate for lower extremity PE.

Venous occlusion has long-term effects that include significant morbidity associated with chronic discomfort and swelling.

Physical activity that involves prolonged use of the afflicted arm might aggravate these sensations.

There is growing proof that endovascular procedures are the preferred treatment option for patients with upper-extremity thrombosis because of advancements in this technology.

This method facilitates a far quicker recovery and, over time, results in lower morbidity and fewer problem

A history of trauma or, more commonly, excessive arm use (>50% of cases) may be mentioned by patients. Frequently occurring triggering actions include backward and downward rotation of the shoulder or repetitive hyperabduction and external rotation of the arm.

Most patients arrive to the emergency department (ED) within 24 hours due to the relatively significant symptoms of subclavian stenosis.

Similar symptoms linked with the indwelling catheter in the ipsilateral arm or shoulder are reported by patients with catheter-related axillary-subclavian vein thrombosis (ASVT).

Palpation

Functional Tests

Systemic Examination

Acute symptoms are:

Swelling, pain or discomfort, Cyanosis or reddish discoloration of the arm, hand, or shoulder

Chronic symptoms are:

Sense of heaviness, tightness, or fatigue in the affected limb

Antiphospholipid Syndrome

Lymphedema

Pancoast Syndrome

Cellulitis

Superior Vena Cava Syndrome

Thrombolytic treatment is advised for patients whose effort-induced vein thrombosis has lasted less than two weeks.

Warfarin is a conservative treatment for chronic axillary-subclavian vein thrombosis (ASVT), and surgical bypass is an option if symptoms are severe.

Conservative care is the first line of treatment for subclavian vein thrombosis. This includes rest, limb elevation, and the use of warm compresses or heat.

Physical therapy is the initial treatment for a small number of individuals with no anatomic abnormalities and few symptoms.

Weight loss and adhesion release at the blockage site are two benefits of structured physical therapy.

Treatment approaches for Paget-von Schrötter syndrome and catheter-induced subclavian vein thrombosis differ based on their distinct natural history.

Thrombolytic therapy is favoured over thrombectomy due to the absence of surgical risks and the potential for an intimal tear caused by the embolectomy catheter.

The elimination of urokinase from the US market compelled interventional radiologists to use tissue plasminogen activator (tPA) in less clinically defined regimens.

Patients with catheter-associated subclavian thrombosis frequently have substantial comorbidity, care must be taken when choosing which individuals should receive thrombolytic therapy.

Surgery, Other

Adjust workstations or exercise regimens to reduce repeated or extended overhead activities.

The thoracic outlet region should not be compressed, thus adjust desk and seating height.

Frequent pauses are necessary to prevent extended strain on the upper limb muscles.

Minimize endothelial damage by using ultrasound guidance when inserting a pacemaker or central venous catheter.

For patients with persistent venous insufficiency or residual swelling, graduated compression sleeves can help relieve venous congestion.

Proper awareness about SVT should be provided and its related causes with management strategies.

Appointments with specialists and preventing recurrence of disorder is an ongoing life-long effort.

Surgery, Vascular

Warfarin:

It lowers the synthesis of active clotting factors and depletes functional vitamin K stores.

Heparin:

It accelerates the rate at which antithrombin neutralizes specific active coagulation factors.

Anatomic abnormalities include congenital fibromuscular bands, shortening of the costoclavicular space due to shoulder depression, or abnormal subclavius or scalenus anterior.

Endoluminal stent placement to avoid stent breakage due to compression against the first rib.

Surgery, Other

In acute phase management, the goal is to prevent thrombus extension and reduce symptoms.

In subacute phase management, the goal is to prevent recurrence and promote clot resolution.

In supportive care and management phase, patients should receive required attention such as lifestyle modification and surgical interventional procedures.

The regular follow-up visits with the specialist are scheduled to check the improvement of patients along with treatment response.

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