The circumstances for setting up dialysis in the neonatal period are multiple: congenital anomaly of the kidney and urinary tract (CAKUT), secondary acute renal failure whose etiologies are multiple (sepsis, hypovolemia, respiratory distress syndrome, neonatal asphyxia, Arterial or venous renal thrombosis, nephrotoxic drugs, etc.), metabolic diseases (mainly hyperammonemia and leucinosis) and post-operative management of heart disease: analysis of the characteristics of the patients in our study and comparison with existing epidemiological data in the literature.

The decision to set up dialysis in a newborn whose recovery of renal function is uncertain or in a context of acute multi-visceral failure is not always obvious and must be discussed carefully. multidisciplinary in connection with neonatologists, resuscitators and nephrologists as well as families with the consideration of the future quality of life of the child.

Inclusion criteria:

• Minor under 28 days old
• Having benefited from a renal purification technique in the pediatric intensive care unit of the University Hospital of Strasbourg
• Holders of parental authority who do not object to the reuse of their child's data for scientific research purposes.

Exclusion criteria:

- Holders of parental authority who have expressed their opposition to the reuse of their child's data for scientific research purposes.

Minor under 28 days old, having benefited from a renal purification technique in the pediatric intensive care unit of the University Hospital of Strasbourg