title: Subarachnoid haemorrhage: epidemiology, natural history, and surgical treatment.
abstract: We analysed 360 patients who presented with a proven subarachnoid haemorrhage during the period 1971-78. The most common cause was a cerebral aneurysm (75%), with the anterior communicating artery being the most common site for a ruptured aneurysm. Overall mortality rate before surgical intervention was 28%. During the period of study, 106 Grade 1 patients underwent direct clipping of their aneurysms; this procedure was associated with a 6.6% mortality rate. Delayed surgical intervention was associated with a lower surgical mortality rate.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D002532:Intracranial Aneurysm / Q000150:complications / Q000401:mortality / Q000601:surgery; D002538:Intracranial Arteriovenous Malformations / Q000150:complications; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012008:Recurrence; D012422:Rupture, Spontaneous; D013345:Subarachnoid Hemorrhage / Q000209:etiology / Q000401:mortality / Q000601:surgery; D013997:Time Factors