title: 5-Aminosalicylic acid-associated renal tubular acidosis with decreased renal function in Crohn's disease.
abstract: The use of 5-aminosalicylic acid (5-ASA, mesalazine) in Crohn's disease is usually well tolerated. Nevertheless, the occasional occurrence of nephrotoxic side effects has been described in several case reports. We present the case of a 34-year-old female in whom chronic use of 5-ASA may have caused renal damage which manifested with tubular acidosis, severe weight loss, shortness of breath and fatigue. For 17 years the patient has suffered from Crohn's disease. She received sulfasalazine (3 g/day) for 12 years and was treated with resin-coated mesalazine (3 g/day) for the last 72 months. Onset of weight loss of 10 kg over a 6-month period, accompanied by progressive shortness of breath and fatigue, lead to a diagnosis of metabolic acidosis and renal bicarbonate loss due to damage to the tubular epithelium. Kidney biopsy demonstrated acute interstitial nephritis which may be related to 5-ASA.
authors.affiliation: Department of Medicine, Tabea Hospital Hamburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Hämling
authors.forename: A
authors.initials: A
authors.lastname: Raedler
authors.forename: U
authors.initials: U
authors.lastname: Helmchen
authors.forename: S
authors.initials: S
authors.lastname: Schreiber
mesh_terms: D000141:Acidosis, Renal Tubular / Q000139:chemically induced* / Q000473:pathology / Q000503:physiopathology; D000328:Adult; D000636:Aminosalicylic Acids / Q000009:adverse effects* / Q000627:therapeutic use; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000009:adverse effects* / Q000627:therapeutic use; D001639:Bicarbonates / Q000652:urine; D001706:Biopsy; D003424:Crohn Disease / Q000150:complications / Q000188:drug therapy* / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007668:Kidney / Q000187:drug effects / Q000503:physiopathology; D019804:Mesalamine; D009395:Nephritis, Interstitial / Q000150:complications / Q000473:pathology / Q000503:physiopathology
chemical_list: D000636:Aminosalicylic Acids; D000894:Anti-Inflammatory Agents, Non-Steroidal; D001639:Bicarbonates; D019804:Mesalamine