A case of transient hyperammonemia in the newborn transient neonatal hyperammonemia.

A case of transient hyperammonemia of the newborn (THAN) is described in this paper. THAN is the disorder that is much more frequently present than diagnosed. Therefore, it is necessary to estimate the serum ammonia level in every preterm newborn infant, who develops the signs of respiratory distress syndrome in the first hours of life, along with the symptoms of hyperammonemia (lethargy, hypotonia, seizures, and coma). Dialysis proved the most effective treatment.