Cerebral infarction is ischemic necrosis or softening of restricted brain tissue due to impaired blood circulation, ischemia and hypoxia in the brain, and changes very rapidly after the onset of the disease, and severe cerebral infarction may lead to life-threatening conditions. Signs before the death of a patient with cerebral infarction are generally manifested in increased impairment of consciousness and changes in breathing and heartbeat. Impaired consciousness: A relatively extensive and critical area of cerebral infarction will affect the control arousal center located in the brainstem, resulting in various degrees of impaired consciousness and, in severe cases, coma in the patient. As the degree of coma gradually increases, the patient will lose response to various strong stimuli, and if there is also eye fixation and dilated pupils, it indicates a very serious condition, and the patient’s life will be in danger at any time. Respiration and heartbeat changes: Respiration and heartbeat are the basis of life support, and the brain is the command center of respiration and heartbeat. Brain herniation or brainstem infarction will destroy the respiratory and circulatory center, causing changes in the rhythm of respiration and heartbeat or even causing respiration and heartbeat to stop, which directly leads to death. The patient’s breathing will be severely irregular, with sighing or sobbing breathing, or even prolonged respiratory arrest, and the respiratory rate will drop significantly, requiring tracheal intubation and ventilator to maintain breathing; the heartbeat will also have significant changes, the heartbeat will lose its inherent rhythm, the blood pressure will drop significantly, and in severe cases, medication will be required to maintain blood pressure and heartbeat, the pulse will be shallow and fast, the blood pressure will drop, or the heart rate will drop or even suddenly These are all indications of a serious condition and can be life-threatening at any time. Therefore, when a patient with cerebral infarction has a deepened barrier to consciousness with obvious changes in breathing and heartbeat, a sharp drop in blood pressure and unstable vital signs such as dilated pupils, it is a sign of life-threatening condition at any time.