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Angiographic vasospasm frequently complicates subarachnoid hemorrhage and has been implicated in the development of delayed cerebral ischemia. Whether large-vessel narrowing adequately accounts for the critical reductions in regional cerebral blood flow underlying ischemia is unclear. We sought to clarify the relationship between angiographic vasospasm and regional hypoperfusion.

Twenty-five patients with aneurysmal subarachnoid hemorrhage underwent cerebral catheter angiography and ¹⁵O-positron emission tomographic imaging within 1 day of each other (median of 7 days after subarachnoid hemorrhage). Severity of vasospasm was assessed in each intracranial artery, whereas cerebral blood flow and oxygen extraction fraction were measured in 28 brain regions distributed across these vascular territories. We analyzed the association between vasospasm …