Effect of Inhalatory Sedation in Subarachnoid Hemorrhage

The aim of this study is to evaluate the effect of inhalational sedation on cerebral perfusion in patients with SAH. It will evaluate whether the administration of isofluorane, by inducing direct vasodilation in the cerebral parenchyma, can improve the cerebral perfusion rates. Perfusional CT will be used to study the variation of cerebral blood flow to rule out the vasodilatory effect on territories with different cerebrovascular reactivity aggravating the phenomena of distrectual hypoperfusion (theft theory).