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Study design with inclusion and exclusion criteria for aSAH patients. Of 289 consecutive patients with SAH, 256 (88.6%) had an intracranial aneurysm as the confirmed source of hemorrhage. From these 256 patients, 246 (96.1%) were included in the study based on available transcranial Doppler ultrasound and angiography findings to confirm the presence or absence of delayed cerebral vasospasm. Of these, 166 (67.5%) had angiographic or sonographic evidence of vasospasm.
