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Subclavian steal syndrome presenting as a reversible dementia.

To the Editor: Carotid stenosis can lead to stroke or cerebral hypoperfusion, resulting in cognitive impairment that can be ameliorated by reperfusion. Less is known about the effect of vertebrobasilar insufficiency on cognition and its possible improvement with stenting. A literature review suggests that vertebrobasilar insufficiency may produce mild cognitive impairments characterized by axial amnesia—the impairment of learning new information. The authors describe a woman with vertebrobasilar insufficiency and subclavian steal syndrome who exhibited a 2-year history of dementia that was reversed following stenting.