Inclusion Criteria:  Adult patients admitted to our surgical ICU aged between (18-60) years old World Federation of Neurological Surgeons grades 1-3 Grades  Exclusion Criteria:  Aneurysmal SAH SAH with Fisher Grade I and IV, World Federation of Neurological Surgeons grade IV & V No informed consent, peripheral vascular disease Cardiac disease (heart block, severe valvular stenosis, cardiomyopathothy , ejection fraction<40%), Renal impairment (serum creatinine ≥ 1.4 mg.L-1), Hemodynamic instability