[Bartter's syndrome. Pathophysiology in three cases (author's transl)].

The primary pathologic defect in Bartter's syndrome is unknown. Three patients have been studied. In two of them, with normal intra-erythrocite sodium concentration, authors prove the existence of an impaired proximal tubular sodium reabsorption. In the last case, with a high intra-erythrocite sodium concentration, this impaired sodium reabsorption was localized in the proximal and distal tubular portions.