Atrial fibrillation leads to how long a patient can live with brain infarction, mainly related to the severity of the patient’s disease. It can be considered from the following aspects: 1. If the thrombus shed by atrial fibrillation is relatively large, resulting in infarction of large blood vessels in the brain of the patient, causing a large area of cerebral infarction in the patient, generally if the treatment is not timely or the effect of treatment is not satisfactory, usually the patient will die within 2-3 days of the onset. Because atrial fibrillation causes patients to have brain infarction, the symptoms are severe in about 2-3 days belong to the acute phase of cerebral edema, which can easily lead to brain herniation and cause sudden death of patients. 2, if the area of brain infarction caused by atrial fibrillation is relatively small, it usually does not cause patients to die, and through active treatment, the patient’s symptoms can be improved to a certain extent.