Subclavian steal phenomenon or Subclavian steal steno-occlusive disease
The proximal part of left subclavian is blocked (shaded artery). This prevents antegrade ("forward") flow to the left arm and left vertebral. As a result, flow in the left vertebral is retrograde ("backwards") towards the left arm. Flow to the brain and circle of Willis is via antegrade right and left carotid and right vertebral arteries.
Specialty
Neurology
Subclavian steal syndrome (SSS), also called subclavian steal steno-occlusive disease, is a constellation of signs and symptoms that arise from retrograde (reversed) blood flow in the vertebral artery or the internal thoracic artery, due to a proximal stenosis (narrowing) and/or occlusion of the subclavian artery. This flow reversal is called the subclavian steal or subclavian steal phenomenon, regardless of signs/symptoms being present.[1] The arm may be supplied by blood flowing in a retrograde direction down the vertebral artery at the expense of the vertebrobasilar circulation. It is more severe than typical vertebrobasilar insufficiency.
^Labropoulos, N; Nandivada, P; Bekelis, K (July 2010). "Prevalence and impact of the subclavian steal syndrome". Annals of Surgery. 252 (1): 166–70. doi:10.1097/SLA.0b013e3181e3375a. PMID 20531004. S2CID 2165442.
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