Subclavian Steal Syndrome

Treat acute focal neurologic deficits, persistent posterior-circulation symptoms, or recurrent transient neurologic episodes as possible TIA or stroke until proven otherwise. Subclavian steal can produce transient vertigo, diplopia, ataxia, dysarthria, syncope, and drop attacks, particularly when provoked by ipsilateral arm exertion or head positioning, but these symptoms are not specific for steal. PubMed+1PubMedSymptomatic subclavian steal syndrome: Report of four Moroccan cases and literature reviewPubMedSubclavian steal syndrome: a case study of diagnosis, management, and successful surgical resolution

A patient has clinically meaningful subclavian steal syndrome when neurologic symptoms are attributable to posterior-circulation hypoperfusion and testing demonstrates marked proximal subclavian or innominate stenosis or occlusion, retrograde ipsilateral vertebral flow, and patent vertebral and basilar arteries. Isolated retrograde vertebral flow without this clinical-anatomic correlation is subclavian steal phenomenon and is often discovered incidentally. ScienceDirect+1ScienceDirectCoronary Subclavian Steal Syndrome - an overviewPubMedSubclavian Steal Syndrome - StatPearls - NCBI Bookshelf

In patients with prior coronary artery bypass grafting using an ipsilateral internal mammary artery, exertional angina, acute coronary syndrome, or otherwise unexplained myocardial ischemia should trigger evaluation for coronary-subclavian steal. The mechanism is reversal of flow through the internal mammary graft caused by subclavian stenosis proximal to the graft origin; reports associate this syndrome with proximal stenosis exceeding 70%. jacc+2jaccCORONARY ARTERY SUBCLAVIAN STEAL SYNDROME ...WileyA Case Report of Coronary‐Subclavian Steal Syndrome ...PubMedSubclavian Steal Syndrome - StatPearls - NCBI Bookshelf

At bedside, measure blood pressure in both arms and compare pulses, temperature, and evidence of distal ischemia. An interarm pressure difference can reveal otherwise asymptomatic subclavian stenosis, but it does not establish neurologic symptom causality or define lesion extent. PubMedPubMedSubclavian Steal Syndrome - StatPearls - NCBI Bookshelf

Order cervical duplex ultrasonography with Doppler assessment of both subclavian and vertebral arteries as the initial vascular test. Retrograde vertebral flow supports steal; a bidirectional vertebral waveform may occur with severe subclavian disease. Duplex can measure velocity and flow direction but may inadequately visualize the proximal subclavian artery or the full extracranial vertebral course because of bony shadowing. ScienceDirect+2ScienceDirectSubclavian Steal Syndrome - an overviewScienceDirectDuplex Ultrasonography of Vertebral and Subclavian Arteries - ScienceDirectScienceDirectEvaluation of Severe Subclavian Artery Stenosis by Color Doppler Flow Imaging - ScienceDirect

Use CTA or MRA after an abnormal or equivocal duplex when symptoms could justify revascularization. These modalities provide anatomic definition of the aortic arch, diseased subclavian segment, vertebral origin, and relationship to the internal mammary artery; this distinction is particularly important before treating left-sided disease in a patient with an internal mammary graft. ScienceDirect+2ScienceDirectSubclavian Steal Syndrome - an overviewScienceDirectCoronary Subclavian Steal Syndrome - an overviewPubMedThe role of magnetic resonance angiography in the diagnosis of subclavian steal - PubMed

Do not grade the clinical severity of subclavian obstruction solely from the degree of vertebral-flow reversal. Severe subclavian stenosis may lack typical steal waveforms when there is proximal vertebral stenosis or occlusion, vertebral hypoplasia, or contralateral subclavian disease. ScienceDirect+1ScienceDirectDuplex Ultrasonography of Vertebral and Subclavian Arteries - ScienceDirectScienceDirectEvaluation of Severe Subclavian Artery Stenosis by Color Doppler Flow Imaging - ScienceDirect

Until definitive assessment, advise patients with reproducible arm-exertional symptoms to avoid strenuous use of the affected extremity because arm demand can provoke vertebrobasilar symptoms or ischemic arm pain. This is a temporary symptom-prevention measure, not a substitute for urgent neurovascular assessment when focal deficits are present. PubMed+1PubMedSubclavian Steal Syndrome - StatPearls - NCBI BookshelfPubMedSubclavian steal syndrome: a case study of diagnosis, management, and successful surgical resolution

Institute secondary vascular prevention for subclavian atherosclerotic disease: smoking cessation, blood-pressure control, glycemic control, and lifestyle modification are specifically recommended preventive measures. Because subclavian stenosis is a marker of atherosclerosis and future myocardial ischemia or stroke risk, address cardiovascular risk even when no revascularization is planned. PubMed+1PubMedSubclavian Steal Syndrome - StatPearls - NCBI BookshelfPubMedSubclavian Artery Stenosis - StatPearls - NCBI Bookshelf

Do not use absence of neurologic symptoms to dismiss clinically important coronary or limb consequences. Reassess for angina in patients with internal mammary grafts, for dialysis-access dysfunction in patients with ipsilateral hemodialysis access, and for functional arm limitation; each changes the threshold for revascularization. PubMed+1PubMedSubclavian Steal Syndrome - StatPearls - NCBI BookshelfPubMedSubclavian Artery Stenosis - StatPearls - NCBI Bookshelf

Offer revascularization to patients with symptomatically important posterior-circulation ischemia, coronary-subclavian steal, dialysis-access dysfunction, or quality-of-life-limiting upper-extremity ischemia after anatomic confirmation. In the symptomatic population, percutaneous modalities are commonly used first line because endovascular techniques have changed practice and are associated with lower morbidity, mortality, and cost in reported reviews; comparative long-term randomized evidence remains limited. PubMed+1PubMedSymptomatic subclavian steal syndrome: Report of four Moroccan cases and literature reviewPubMedSubclavian Artery Stenosis - StatPearls - NCBI Bookshelf

Use CTA, MRA, or catheter angiography to determine lesion location relative to the vertebral and internal mammary origins before choosing angioplasty and stenting versus surgical reconstruction. Atherosclerotic disease is usually proximal, and the procedure must restore inflow without compromising vertebral or internal mammary circulation. JAMA+2JAMAProximal Extracranial Vertebral Artery Disease in the New ...ScienceDirectSubclavian Steal Syndrome - an overviewScienceDirectCoronary Subclavian Steal Syndrome - an overview

Surgical revascularization remains an option when lesion anatomy is unsuitable for endovascular treatment or when a durable reconstruction is required. Case-based literature reports improvement in chronic vertebrobasilar insufficiency after surgical treatment, but treatment selection should be individualized to lesion anatomy, prior interventions, and the affected vascular territory. Wiley+1WileyChronic vertebrobasilar insufficiency in subclavian steal ...PubMedSymptomatic subclavian steal syndrome: Report of four Moroccan cases and literature review