Dizziness & Syncope — Vascular Causes, Evaluation & Treatment in Sarasota & Bradenton
Dizziness and fainting have many causes, and most of them are not serious. But when these symptoms happen alongside other signs of poor circulation — arm fatigue, headaches, or vision changes — a vascular cause is worth investigating. Sometimes narrowing in the carotid arteries or the arteries to the brain can reduce blood flow enough to cause these kinds of episodes, particularly in people with cardiovascular risk factors.
Vascular Causes of Dizziness
The vascular system supplies the brain with the oxygen-rich blood it needs to function. Any significant compromise of cerebral blood flow — even transiently — can produce dizziness, lightheadedness, vision changes, speech difficulty, or loss of consciousness. Two important vascular causes evaluated by our team include carotid disease causing TIAs with anterior circulation symptoms (sudden one-sided weakness, speech problems, vision loss in one eye) and subclavian steal syndrome causing posterior circulation symptoms (vertigo, bilateral vision blurring, ataxia, drop attacks) triggered by arm exercise.
Carotid Artery Disease and TIA
A transient ischemic attack (TIA) — often called a mini-stroke — is a brief episode of neurological dysfunction caused by temporary blockage of blood flow to the brain, most commonly from a small clot or plaque fragment breaking off from the carotid artery. TIA symptoms include sudden dizziness, one-sided face or arm numbness or weakness, difficulty speaking, or sudden vision loss in one eye. A TIA is a medical emergency — 10–15% of patients have a major stroke within 90 days. Immediate evaluation and treatment (CEA, TCAR, or carotid stenting) dramatically reduces stroke risk.
Subclavian Steal Syndrome
Subclavian steal syndrome produces posterior circulation symptoms — dizziness, vertigo, ataxia, visual changes — triggered by arm use, particularly overhead activities. Blood is diverted retrograde from the basilar artery down the vertebral artery to supply the arm beyond a stenosed subclavian artery. The symptoms characteristically relate to arm activity and are reproduced by arm exercise testing. Treatment with subclavian artery stenting eliminates the steal and resolves symptoms.
Evaluating Dizziness in Sarasota & Bradenton
Our vascular surgeons evaluate patients with dizziness and TIA symptoms with carotid duplex ultrasound — the front-line test for carotid stenosis — and subclavian artery assessment. CT angiography of the head and neck provides detailed vascular imaging. Close coordination with neurology ensures appropriate stroke-risk stratification and management.