[Neonatal variant of Bartter syndrome].

A male preterm infant of 32 weeks of gestation with history of severe polyhydramnios during pregnancy presented soon after birth with polyuria with initial sodium chloride loss subsequently followed by increasing potassium loss. After manifestation of hypokalaemia, hypochloraemia, alkalosis and high urinary prostaglandin concentrations, the diagnosis of the neonatal variant of Bartter's syndrome was made. The treatment consisted of administered of large amounts of fluid with sodium chloride and potassium supplementation and indomethacin (1.5 to 2 mg/kg per day).