Brain infarction is a relatively serious ischemic cerebrovascular accident that may lead to sudden death, depending on where the infarction is located and how extensive the infarction is. If it is a large brainstem infarction, especially a lower brainstem medulla oblongata infarction, the patient may have difficulty swallowing, which in turn may cause difficulty breathing, and then sudden death may occur. If it is a cerebral hemisphere infarction, it will cause severe cerebral edema, which will lead to the formation of cerebellar curtain incisional hernia, and the patient will become unconscious, pupil dilatation, limb paralysis, and urinary and fecal dysfunction, and if the treatment is not done in a timely manner with craniotomy decompression surgery, the patient will definitely develop central respiratory and circulatory failure and die as a result.