Prerenal oliguria or anuria is due to

Oliguria, mainly 24 hours of urine volume less than 400 ml. Anuria, mainly 24 hours of urine volume less than 100 ml. This condition is divided into prerenal, renal and postrenal. The main reason for prerenal is insufficient renal perfusion, such as a large loss of fluid, not timely replacement. Or after a large amount of blood loss, not timely rehydration, transfusion treatment. In this case, after a large number of rehydration, can effectively increase urine volume. At the same time of rehydration, it is necessary to closely observe the changes in blood pressure, heart rate and urine volume, so as to effectively supplement blood volume and improve the patient's vital signs.