Ribeiro, JPMarcelino, PMarum, SFernandes, APGrilo, A2012-12-062012-12-062004Crit Care. 2004 Jun;8(3):R137http://hdl.handle.net/10400.17/773Purple urine bag syndrome (PUBS) was first reported in 1978. PUBS is rare, occurs predominantly in constipated women, chronically catheterized and associated with some bacterial urinary infections that produce sulphatase/phosphatase. The etiology is due to indigo (blue) and indirubin (red) or to their mixture that becomes purple. A chain reaction begins in the gastrointestinal tract with tryptophan as described in the article.engCatéteres PermanentesSíndromeCateterização UrináriaInfecções do Sistema UrinárioUrinajournal article