Blood Pressure Variability and the Prognosis of Ischemic Stroke With Intracranial Artery Stenosis

Inclusion Criteria: * age : ≥ 18 years of age , ≤ 75 years old * with intracranial artery stenosis in ischemic stroke * the diagnosis of ischemic cerebrovascular disease are in line with the diagnostic criteria developed by the Chinese Medical Association Fourth National Cerebrovascular Disease Conference * the patient admitted to hospital receive at least one examination like cranial MRI + DWI, MRA and TCD examination, clearly associated with intracranial arterial stenosis * MRS score ≤ 3 points Exclusion Criteria: * vascular , cardiac , and unknown causes or other reasons lead to ischemic stroke * associated with significant emotional disorders, cognitive impairment or other mental disorders can not be partners * severe occlusion of Unilateral intracranial arteries ( over 90 % ) or bilateral stenosis more than 70% * With extracranial artery stenosis, especially carotid and vertebral artery stenosis . * patients with extracranial artery stenosis or patients previously done neck or intracranial artery balloon dilation , stent forming surgery or carotid endarterectomy * Incomplete clinical data collection in patients