Stroke is a major cause of death and disability in developing and developed countries (Murray & Lopez 1996). Incidence rises steeply with age so that about three quarters of incident strokes occur in people over 65 years of age. In community-based studies among whites, around 80% of strokes are ischaemic, while 15% are due to primary intracerebral haemorrhage, and 5% to subarachnoid haemorrhage (Fig. 1). The proportion of haemorrhagic strokes in the mainly non-white populations of Asia and Africa may be somewhat higher, but ischaemic stroke is still the dominant problem (Sudlow & Warlow 1997).
The management of patients with acute ischaemic stroke aims to restore tissue perfusion, minimize cytotoxic brain damage and cerebral oedema, prevent complications of stroke, and prevent a recurrent stroke or other serious vascular event.
About 10% of patients with a first-ever acute ischaemic stroke die within 30 days of onset. Most of these early
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