Antenatal Bartter syndrome (Q85249)

This is a rare inherited defect characterised by polyhydramnios (Increased water in the uterus) due to polyuria in utero. In contrast to Classic Bartter Syndrome and Gitelman Syndrome, the Antenatal variant of Bartter Syndrome has both the features of metabolic alkalosis (from the low potassium), as well as profound systemic manifestations. Out of all of the variants, this form is the most severe.