Investigators aimed to investigate the changes of glymphatic function after remote ischemic postcondioning treatment in acute ischemic stroke .

Inclusion Criteria:

• The patient was 18-80 years old;
• The NIHSS score was ≤ 25 and NIHSS > 5，Glasgow coma score ≥ 8;
• The patients were diagnosed as anterior circulation cerebral infarction and could start remote ischemic postcondioning within 24 hours after onset
• Normal to random time within 24 hours
• Written informed consent signed by patients or their families

Exclusion criteria:

• patients receiving thrombolysis or endovascular therapy;
• modified Rankin scale (mRS) score ≥ 2 before this attack;
• other intracranial lesions, such as cerebral hemorrhage, cerebral venous disease, severe subclavian artery stenosis and other diseases involving the brain;
• Arterial blood pressure ≤ 90/60mmHg or ≥ 180/100mmHg after treatment.