Low Intracranial Pressure Treatment Strategies for Chronic Subdural Hematoma Patients

Inclusion Criteria: * patients above 14 yrs with chronic subdural hematoma confirmed by cranial imaging; * patients with MGS-GCS score ≤1 point, showing no signs of neurological deficits caused by CSDH or characteristics of high intracranial pressure; * patients with MGS-GCS score ≥1 point, but with medication history of anticoagulant or antiplatelet drugs, coagulation dysfunction so that they are unsuitable or intolerant of surgery although they are in stable condition; * patients who are unwilling to operate when they have no life-threatening brain herniation or no indications for emergency surgery, which confirmed by two neurosurgeons Exclusion Criteria: * women pregnant or in lactation * those who are allergic to atorvastatin, hypoxamethasone; * patients with brain herniation or altered mental status; * patients with primary diseases like tumors, hemorrhagic diseases or some other critically serious conditions( eg.multiple organ failure); * patients with uncontrollable diabetes and heart failure * patients with preexisting chronic abdominal diseases (such as inflammatory bowel disease) or lung tumors or digestive system neoplasm * Patients with abnormal liver function * patients had taken atorvastatin or dexamethasone, ACEI in the past one week * other conditions not eligible to enroll the trial confirmed by two individual doctor