For persistent anuria, death may generally occur in 3-7 days. Persistent anuria is renal failure. With prolonged anuria, it is impossible to eliminate a large amount of urea nitrogen and creatinine from the body, and a large amount of toxins accumulate in the body, which can lead to heart failure, nephrogenic encephalopathy and complications of acute respiratory dysfunction, as well as coagulation dysfunction. This is a very dangerous condition, and it is recommended that in the case of anuria, treatment should be actively carried out, and if necessary, hemodialysis is needed to effectively remove urea nitrogen and creatinine from the body, so that the condition can be slowly controlled and the life of a normal person can be effectively restored.