Background and Purpose—Stroke is the third leading cause of death and the leading cause of disability in the United
States. Intracerebral hemorrhage and subarachnoid hemorrhage represent 20% of all stroke cases and have a mortality
rate of 40% to 50%. Hypertension is an important risk factor for these subtypes of stroke. We sought to determine
whether untreated hypertension carries a different risk from treated hypertension for hemorrhagic stroke.