Classic Bartter syndrome is a type of Bartter syndrome, characterized by a milder clinical picture than the antenatal/infantile subtype, and presenting with failure to thrive, hypokalemic alkalosis, increased levels of plasma renin and aldosterone, low blood pressure and vascular resistance to angiotensin II. The disease is Bartter disease type 3 (MONDO_0011822). Also known as: BARTS3, Bartter syndrome type 3, Bartter syndrome type III, adult Bartter syndrome, classic Bartter syndrome.