Abstract
Subarachnoid haemorrhage represents 8% of all cerebrovascular events. Up to 25% of patients are dead within 24 hours, the figure rising to perhaps 50% by three months [1]. Subarachnoid haemorrhage from aneurysmal rupture reaches a peak incidence in the early fifties, some 20 years later than for cases due to arteriovenous malformation [2]. Anterior communicating aneurysms are the commonest source of subarachnoid bleeding, followed by posterior communicating then middle cerebral aneurysms. Vertebrobasilar aneurysms account for some 5% of the total [2]. Aneurysmal rupture is more common in women, except for the anterior communicating group. Some 20% of patients have more than one aneurysm. Other sources of subarachnoid haemorrhage include primary haemorrhage into the brain substance with subsequent rupture into the subarachnoid space or ventricular system, and bleeding due to a disorder of haemostasis.
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© 1988 G.D. Perkin
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Perkin, G.D. (1988). Neurological emergencies — 2. In: Diagnostic Tests in Neurology. Diagnostic Tests Series. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3320-1_12
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DOI: https://doi.org/10.1007/978-1-4899-3320-1_12
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