Our aim was to analyze death prognostic factors in the first six months or the development of major neurological complications (delayed brain ischaemia and rebleeding) or general complications (cardiorespiratory, hydroelectrolytic or infectious) in non-traumatic subarachnoid haemorrhage. We carried out an observational study of a historical cohort of 111 patients admitted consecutively to our Centre between 1986 and 1992 and who were diagnosed as having subarachnoid haemorrhage based upon clinical data and confirmed in all cases by brain computerized tomography (CT) scan and/or lumbar puncture. Clinical variables upon admission were collected prospectively and radiological data were obtained retrospectively. We performed a logistic regression analysis which showed as significant predictive variables for death in the first six months a score on the Hunt-Hess scale greater than 2, a score on the Glassow scale of less than 9, female, aged over 50 and rebleeding. As predictive factors for delayed brain ischaemia we identified the female sex and the existence of earlier general complications. In the development of rebleeding a significant predictive factor was high blood pressure antecedents although this may have been controlled upon admission. For the appearance of general complications, significant predictive factors were more than 2 on the Hunt-Hess scale and hypertension antecedents. The use of these predictive parameters may help evaluate a prognosis in subarachnoid haemorrhage patients and also help make decisions in the management of this pathology.