subclavian steal syndrome
Reversal of vertebral artery flow due to proximal subclavian artery stenosis, potentially causing cerebral hypoperfusion.
Full Definition
Subclavian steal syndrome occurs when significant stenosis or occlusion of the proximal subclavian artery causes reversal of flow in the ipsilateral vertebral artery. This retrograde flow 'steals' blood from the posterior cerebral circulation to supply the affected upper extremity, potentially causing vertebrobasilar insufficiency. Symptoms may include arm claudication, dizziness, syncope, or other posterior circulation neurological symptoms that worsen with arm exercise. The condition can be asymptomatic (subclavian steal phenomenon) or symptomatic (subclavian steal syndrome), with treatment reserved for symptomatic cases.
Usage
Usage note: Distinguish between 'phenomenon' (asymptomatic) and 'syndrome' (symptomatic) in clinical documentation.
In Context
- "Duplex ultrasonography demonstrated retrograde vertebral flow consistent with subclavian steal syndrome." — Imaging report
- "The patient's dizziness with arm exercise was attributed to subclavian steal syndrome." — Clinical assessment