TREATMENTS
Subclavian & Upper-Extremity Artery Treatment
Blockages aren't limited to the legs. When the subclavian artery — the main artery supplying the arm — narrows, it can cause arm fatigue, uneven arm blood pressures, dizziness, and problems for dialysis access or prior bypass grafts. These are problems that often go unlooked-for — uneven blood pressure or arm fatigue gets shrugged off — which is exactly why we check.
What it is
The subclavian artery is the main artery supplying each arm, and it also gives rise to the vertebral artery that feeds the back of the brain. When it narrows — almost always from atherosclerosis, most often on the left — the arm receives less blood, and in some cases the vertebral artery reverses direction to supply the arm instead, pulling blood away from the brain. That reversal is called subclavian steal.
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Arm fatigue, aching, or weakness with use
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A meaningful difference in blood pressure between the two arms
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Dizziness with arm activity (subclavian steal); a reduced or absent pulse in one arm
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Problems affecting dialysis access flow or a prior bypass graft
Why it matters
Arm artery disease is easy to dismiss. Uneven blood pressure gets attributed to the cuff; arm fatigue gets attributed to age. Even so, it matters for three reasons.
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It is a marker. A subclavian narrowing is atherosclerosis, and atherosclerosis is rarely confined to one artery. It raises the question of coronary and carotid disease. Coronary → Carotid →
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It can starve a dialysis access. An access downstream of a narrowed subclavian may never mature, or may fail repeatedly for reasons that look local and are not. Dialysis access →
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It can distort every blood pressure you have ever had recorded. If one arm reads low because of a narrowing, treatment decisions have been made on the wrong number.
Risk Factors
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Smoking or any nicotine use →
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Diabetes, high blood pressure, high cholesterol
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Known atherosclerosis elsewhere — coronary, carotid, or peripheral artery disease
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Older age; chronic kidney disease
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Prior chest or neck radiation; prior coronary bypass using the internal mammary artery, where a subclavian narrowing upstream can compromise the graft
Diagnostic Testing
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Bilateral arm blood pressures. The simplest test there is, and the one most often skipped. A meaningful difference between arms is the finding.
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Upper-extremity arterial duplex ultrasound, in our office, with no dye and no radiation →
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Vertebral artery duplex to look for reversed flow, when steal is suspected
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CT or catheter angiography when the anatomy must be defined before treatment Diagnostic Imaging →
Treatment Options
Medical Therapy
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Risk-factor control: statin, blood pressure, diabetes, tobacco cessation
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Antiplatelet therapy →
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Observation when the narrowing is incidental and the arm is not symptomatic
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Many subclavian narrowings never need to be opened. A narrowing found on imaging is not, by itself, a reason to treat it.
Invasive Treatment
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Through a small puncture, we image the subclavian and arm arteries and reopen the narrowing with angioplasty and, when needed, a stent. Outpatient — nearly all patients home the same day.
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We treat when symptoms are limiting, when steal is causing neurologic symptoms, when a dialysis access or a bypass graft depends on that inflow, or when the arm pressure is compromising the management of your blood pressure.
Frequently asked questions
For referring providers — We welcome referrals for arm claudication, inter-arm BP differential, subclavian steal, and access- or graft-related subclavian disease. Refer: (918) 943-5303 · fax (855) 312-3594.
When to refer: arm claudication, an inter-arm BP differential, subclavian steal, or access/graft-related subclavian disease. Full referral guide →