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Note: Data from 275 patients reported by Hunt and Hess in 1968, 214 patients from Johns Hopkins in 1997, and 534 patients enrolled in the Columbia Subarachnoid Hemorrhage Outcomes Project in 2001.

Note: Data from 275 patients reported by Hunt and Hess in 1968, 214 patients from Johns Hopkins in 1997, and 534 patients enrolled in the Columbia Subarachnoid Hemorrhage Outcomes Project in 2001.

PROGNOSIS AND OUTCOMES FOLLOWING ANEURYSMAL SUBARACHNOID HEMORRHAGE Table 3 The Fisher Scale

Grade Computed tomography scan

1 No blood visualized

2 A diffuse deposition or thin layer, with all vertical layers of blood less than 1 mm in thickness

3 Localized clots and/or vertical layers of blood 1 mm or greater in thickness

4 Diffuse thin or no subarachnoid blood, but with intracerebral or intraventricular clots

Note: The 1-mm criterion for differentiating thick versus thin aneurysmal subarachnoid hemorrhage (aSAH) was based on actual millimeters measured on the printed computed tomography films and, thus, is not generalizable to patients' millimeters. Grade 4 excludes patients with thick aSAH, hence a patient with a large ventricular or intracerebral clot and thick cisternal aSAH would be classified as grade 3.

assessment of the patient's perceived physical, social, and emotional health status and well being) (Table 5). Disability can be further categorized into loss of independence in self-care ADLs, such as walking, toileting, and eating, and loss of higher level instrumental ADLs, such as using the telephone, shopping, and housekeeping.

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