Type your tag names separated by a space and hit enter

Subclavian Steal Syndrome

Subclavian Steal Syndrome is a topic covered in the 5-Minute Clinical Consult.

To view the entire topic, please or purchase a subscription.

5-Minute Clinical Consult (5MCC) app and website powered by Unbound Medicine helps you diagnose and manage 900+ medical conditions. Exclusive bonus features include Diagnosaurus DDx, 200 pediatrics topics, and medical news feeds. Explore these free sample topics:

5-Minute Clinical Consult

-- The first section of this topic is shown below --



  • Subclavian steal syndrome (SSS): a condition that results from stenosis or occlusion of the subclavian artery proximal to the origin of the vertebral artery, causing retrograde flow in the ipsilateral vertebral artery. Blood is drawn from the contralateral, vertebral, basilar, or carotid artery regions into the low-pressure ipsilateral upper limb vessels, “stealing” the blood flow from the circle of Willis.
  • The term was reported for the first time by Fisher in 1961. It is a normal pattern of collateral response to proximal subclavian artery occlusion.


  • Predominant age:
    • Age >55 years—atherosclerotic etiology
    • Age <30 years—90% of patients with Takayasu arteritis
  • Predominant sex: female > male
  • More frequent in African Americans and Caucasians when compared with Hispanics and Chinese Americans

  • Present is estimated to be 0.6–6% of the population.
  • Hemodynamically significant left subclavian artery stenosis is present in ~2.5% of patients undergoing coronary revascularization.

Etiology and Pathophysiology

  • With a left subclavian occlusion or high-grade stenosis, maintenance of blood flow to the left arm occurs with reversal of flow from the basilar artery via the left vertebral artery.
  • Symptoms are associated with the degree and location of a second extracranial vessel occlusion.
  • Arteriosclerosis obliterans of the proximal subclavian artery in 95% of cases
  • Lesions are 4:1 more common on the left side; left-sided SSS is usually acquired.
  • Less common causes of obstruction:
    • Dissecting aneurysm of aortic arch
    • Trauma
    • Embolus
    • Radiotherapy induced
    • Takayasu arteritis: The left subclavian artery is most commonly affected, and patients present in their 30s.
    • Giant cell arteritis
    • Fibromuscular dysplasia
    • May happen after Blalock-Taussig procedure for tetralogy of Fallot
    • Subclavian artery compression from a cervical rib

Risk Factors

  • Smoking
  • Hypertension
  • Diabetes
  • Hyperlipidemia
  • Radiotherapy

Commonly Associated Conditions

  • Carotid artery disease
  • Coronary artery disease is present in 30–60% of patients.
  • Arteriosclerosis

Geriatric Considerations
Older patients are more likely to have arteriosclerosis.

-- To view the remaining sections of this topic, please or purchase a subscription --


Stephens, Mark B., et al., editors. "Subclavian Steal Syndrome." 5-Minute Clinical Consult, 27th ed., Wolters Kluwer, 2019. 5minute, www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/116574/all/Subclavian_Steal_Syndrome.
Subclavian Steal Syndrome. In: Stephens MB, Golding J, Baldor RA, et al, eds. 5-Minute Clinical Consult. 27th ed. Wolters Kluwer; 2019. https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/116574/all/Subclavian_Steal_Syndrome. Accessed August 19, 2019.
Subclavian Steal Syndrome. (2019). In Stephens, M. B., Golding, J., Baldor, R. A., & Domino, F. J. (Eds.), 5-Minute Clinical Consult. Available from https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/116574/all/Subclavian_Steal_Syndrome
Subclavian Steal Syndrome [Internet]. In: Stephens MB, Golding J, Baldor RA, Domino FJ, editors. 5-Minute Clinical Consult. Wolters Kluwer; 2019. [cited 2019 August 19]. Available from: https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/116574/all/Subclavian_Steal_Syndrome.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Subclavian Steal Syndrome ID - 116574 ED - Stephens,Mark B, ED - Golding,Jeremy, ED - Baldor,Robert A, ED - Domino,Frank J, BT - 5-Minute Clinical Consult, Updating UR - https://www.unboundmedicine.com/5minute/view/5-Minute-Clinical-Consult/116574/all/Subclavian_Steal_Syndrome PB - Wolters Kluwer ET - 27 DB - 5minute DP - Unbound Medicine ER -