Intraoperative Dexmedetomidine Infusion in Endovascular Intervention for Aneurysmal Subarachnoid Hemorrhage

Inclusion Criteria: * Aged \>18 years. * Both sexes. * American Society of Anesthesiologists (ASA) I-III * Unruptured subarachnoid hemorrhage (SAH) confirmed by digital subtraction catheter angiography (DSA) undergoing endovascular intervention with general anesthesia. Exclusion Criteria: * Subarachnoid hemorrhage (SAH) from a lesion other than a ruptured saccular aneurysm. * Intraventricular or intracerebral blood in the absence of localized thick or diffuse Subarachnoid hemorrhage (SAH). * No or localized thin subarachnoid hemorrhage (SAH) on computed tomography (CT). * Cerebral vasospasm on admission digital subtraction catheter angiography (DSA). * Hypotension (systolic blood pressure 90 mm Hg) refractory to fluid therapy. * Neurogenic pulmonary edema. * Cardiac failure requiring inotropic support. * Severe or unstable concomitant condition or disease or chronic condition. * Kidney and/or liver disease. * Prior cerebral damage on computed tomography (CT) scan such as stroke (\>2 cm maximum diameter). * Pregnancy. * Traumatic brain injury. * Previously treated cerebral aneurysm. * Arterial venous malformation. * Pre-existing cerebrovascular disorder that will affect diagnosis and evaluation of Subarachnoid hemorrhage (SAH). * Ischemic heart disease or second or third-degree atrioventricular block. * Long-term abuse of alcohol, opioids, or sedative-hypnotic drugs. * Obesity (body mass index \[BMI\] \>30 kg/m2).