Abstract
Ninety-six patients with aneurysmal subarachnoid haemorrhage underwent serial measurement of regional cerebral blood flow throughout the period of their treatment over the period of 5 years (1983 to 1988). A portable bedside xenon cerebral blood flow machine was used in this study and the initial slope index (ISI) values showed a clear relationship between reduction of cerebral blood flow and deteriorating clinical grade. Furthermore, serial measurements showed a statistically significant relationship between drop of cerebral blood flow, at anytime during the course of the disease, and fatal or less than satisfactory outcome.
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