For most of the ischemic foci, if the infarct area is not particularly large, it usually does not affect the patient’s life. However, it can produce serious symptoms, such as paralysis of one side of the limb or general sensory impairment, aphasia, visual impairment, and in some cases, partial blindness. In the case of infarction of the cerebral hemispheres, muscle weakness of the face and lower extremities may occur. In the case of ischemia in the vertebrobasilar system, the brainstem, cerebellum, and hypothalamus may develop severe sequelae, such as drowsiness, lethargy, or even coma in severe cases, sometimes with swallowing disorders and ataxia. The most serious one is brainstem ischemia, which seriously leads to coma and even affects the patient’s breathing and heartbeat function, and its may cause life threatening.