**1. Introduction**

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Aneurysmal subarachnoid hemorrhage (SAH) is a neurosurgical emergency that results from the rupture of an aneurysm in the subarachnoid space (see figure 1). SAH carries a high mortality rate, estimated at 45%; additionally, a significant amount of patients are left with impaired neurologic function [1]. The critical care management of SAH requires an appreciation of both neurologic and general critical care principles; it is best thought of as a systemic multi-organ disease.
