In humans, statin administered within the first 72 hours showed to significantly reduce the incidence of vasospasm up to 50% an therefore, induce a lower morbidity and mortality of this severely ill population. The aim of this study is to demonstrate that atorvastatin reduces the incidence of cerebral vasospasm-related morbidity and mortality within 1 year post aneurysmal subarachnoid hemorrhage (aSAH) treated by either clipping or endovascular coiling.