The Effect of Huperzine A Injection on Postoperative Cognitive Dysfunction in Patients With Aneurysmal Subarachnoid Hemorrhage: a Pilot Study

Inclusion Criteria: * Age 18-70; * The patients were proved to be aneurysmal subarachnoid hemorrhage by imaging examination (head CT, CT angiography (CTA), whole brain angiography (DSA)); * Hunt Hess was graded I-III at admission; * The patients were treated with endovascular therapy or craniotomy and clipping surgery; * The time from the onset of aSAH symptoms to admission ≤ 72 hours; ⑥ The subject himself or the guardian of the subject knew and voluntarily signed the informed consent form. Exclusion Criteria: * Non aneurysmal subarachnoid hemorrhage; * Cognitive dysfunction existed before onset; * Patients with angina pectoris, bronchial asthma, mechanical intestinal obstruction, liver and kidney insufficiency, and urinary tract obstruction; * Complicated with other nervous system diseases, including nervous system degenerative diseases (Alzheimer's disease, Parkinson's disease, Lewy body dementia, frontotemporal dementia, etc.), neuromyelitis optica, epilepsy, central nervous system infection (such as AIDS, syphilis, etc.), brain traumatic dementia, etc; * Psychotic patients, according to DSM-IV-TR standards, including schizophrenia or other mental diseases, bipolar disorder, major depression or delirium; * Other cholinesterase inhibitor drugs are being used; ⑦ There are uncorrectable visual and auditory disorders, and neuropsychological tests and scales cannot be completed; * Have unstable or serious heart, lung, liver, kidney and hematopoietic system diseases; * Pregnant or lactating women and women of childbearing age without reliable contraception, and there is no evidence of negative pregnancy; ⑩ Patients who cannot be followed up as required during the study period; ⑪ Those who are allergic to the test drug; ⑫ Those who have participated in other clinical trials in recent 3 months; ⑬ Patients who are not suitable to participate in the clinical trial.