Early Brain Damage Assessment in Aneurysmal Subarachnoid Haemorrhage in Predicting Cognitive Impairment

Inclusion Criteria: first-ever stroke, diagnosed with SAH via CT scan within 24 - 48 hours or lumbar puncture; 2) age between 18 and 70 years; 3) Confirmation of cerebral aneurysm by digital subtraction angiography (DSA) and/or CT angiography (CTA); 4) absence of neurological or psychiatric disease history and each unruptured intracranial aneurysm patient must be admitted to the hospital in excellent preoperative and pre-interventional condition; 5) Informed consent is signed by the patient and/or family. 6)Clinical diagnosis of Alzheimer's Disease Must be able to swallow tablets. \- Exclusion Criteria: 1) patients over 70 years old; 2) presence of neurological focal deficits or severe aphasia; 3) cognitive dysfunction or history of cognitive decline including craniotomy, antipsychotics, neurodegenerative diseases, and chronic subdural hematoma; 4) concurrent acute or chronic infections, corneal or pupillary abnormalities, severe autoimmune or systemic diseases such as rheumatic illnesses of the musculoskeletal system; 5) concurrent severe organic dysfunction; 6) patients with recurrent aneurysms or aneurysms not first diagnosed in our hospital; 7) diagnosis of major psychosis according to the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition criteria 8)Insulin dependent diabetes,9)Thyroid disease