Mg Sulfate Versus Dexmedetomidine on Cerebral Oxygen Saturation

Exclusion Criteria

• •Patient refusal to participate in research.
• •History of preoperative neuromuscular disease.
• •Patients with preexisting cerebral pathology (such as previous episodes of cerebral ischemia or stroke).
• •History of psychiatric illness.
• •History of orthostatic hypotension, myocardial infarction, uncontrolled hypertension or documented carotid stenosis.
• •Coagulopathy disorder.
• •Patients receiving magnesium supplementation.
• •Chronic use of opioids.
• •Current treatment with a β-blocker or calcium channel blocker.