Cerebral monitoring is important for management of severe head injury and critically ill neurologic patient. It is also useful in subarachnoid hemorrhage, stroke, intracerebral hematoma, meningitis, encephalopathies, hepatic failure, after neurosurgery and in patients undergoing carotid artery surgeryThe goals of cerebral monitoring are to detect changes in cerebral hemodynamics, cerebral oxygenation, intracranial pressure, cerebral metabolism and neuronal function. Advances in technology over the last few decades, have produced many new monitors of cerebral function, some of which are now available for clinical use.