Long-term Renal Prognosis of Neonatal Acute Kidney Injury

Inclusion Criteria: * Delivered in this hospital and subsequently admitted to the NICU during the study period; * Diagnosed with neonatal AKI according to the 2015 KDIGO neonatal AKI criteria; * Age \<28 days. Exclusion Criteria: * Severe hydronephrosis diagnosed by prenatal renal ultrasound; * Patients with congenital urinary malformations, including solitary kidney, cystic dysplasia, multicystic dysplastic kidney, renal dysplasia, and obstructive uropathy; * Newborns who required congenital heart surgery within the first 7 days after birth; * Newborns whose mothers had a history of renal failure; * Death within 48 hours after birth; * Other genetic syndromes or medical conditions were not eligible for inclusion according to the attending neonatologist's judgment.