Large cerebral infarction is, as the name implies, a relatively large area of cerebral infarction, and generally the most common site of large cerebral infarction is infarction of the blood supply area due to middle cerebral artery occlusion, or internal carotid artery occlusion. In this case, the assessment criterion is greater than 2/3 of the area of the ipsilateral cerebral hemisphere, which is generally called large cerebral infarction. Its symptoms are more serious, and the patient often has severe hemiparesis, hemianesthesia, and even impaired consciousness and convulsions, and the patient has more complications, including severe pulmonary infections, electrolyte disorders, malnutrition and even gastrointestinal bleeding, which are the manifestations of clinically severe patients. One point to note in the assessment of large cerebral infarction is that in the early stage of cerebral infarction, if CT examination is used, the infarct area may not be shown clearly, so a few days after the occurrence of cerebral infarction, CT or MRI may be repeated to specifically assess the infarct area and extent. In medicine, infarcts larger than 2/3 of the cerebral hemisphere area are classified as large cerebral infarcts, which can cause severe cerebrovascular disease with severe paralysis, partial sensory impairment or even coma and convulsions, as well as more complications such as pulmonary infections, electrolyte disturbances, and gastrointestinal bleeding.