title: Effective therapy for severe Henoch-Schonlein purpura nephritis with prednisone and azathioprine: a clinical and histopathologic study.
abstract: OBJECTIVE
  To validate a scoring system to assess the severity of renal lesions and to correlate histology with clinical findings. We also examined the efficacy of treatment with prednisone (1 to 2 mg/kg/d) and azathioprine (1 to 2 mg/kg/d) for severe Henoch-Schonlein purpura (HSP) nephritis.
  
  
  METHODS
  Twenty patients were evaluated retrospectively. All underwent biopsy before treatment, and 13 underwent biopsy after therapy. We developed a scale based on glomerular, tubulointerstitial (TI), and vascular changes and assigned all specimens acuity, chronicity, and TI scores. The outcomes of 17 patients were compared with those of a historical control group.
  
  
  RESULTS
  Chronicity score at initial biopsy increased with increasing delay between onset of renal involvement and first biopsy (rho = 0.55, P =.016) but did not progress after treatment was initiated. Both acuity (rho = 0.57,P =. 016) and TI (rho = 0.69, P =.003) scores correlated with clinical severity at first biopsy. The TI score correlated negatively with serum albumin (rho = -.60, P <.01). Significantly more patients in the study group than in the control group had a favorable outcome (15 [88%] of 17 vs 32 [54%] of 59, P =.011).
  
  
  CONCLUSIONS
  Our scale reflects disease activity and highlights the importance of TI changes in severe HSP nephritis. Outcome comparisons indicate that early treatment with prednisone and azathioprine prevents progression of chronic changes and improves outcome.
authors.affiliation: Departments of Nephrology and Pathology, Montreal Children's Hospital, McGill University, Montreal, Quebec, Canada.
authors.forename: B J
authors.initials: BJ
authors.lastname: Foster
authors.forename: C
authors.initials: C
authors.lastname: Bernard
authors.forename: K N
authors.initials: KN
authors.lastname: Drummond
authors.forename: A K
authors.initials: AK
authors.lastname: Sharma
mesh_terms: D000293:Adolescent; D000328:Adult; D000893:Anti-Inflammatory Agents / Q000627:therapeutic use*; D001379:Azathioprine / Q000627:therapeutic use*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D011695:IgA Vasculitis / Q000150:complications / Q000188:drug therapy* / Q000473:pathology*; D007166:Immunosuppressive Agents / Q000627:therapeutic use*; D008297:Male; D009393:Nephritis / Q000150:complications / Q000188:drug therapy* / Q000473:pathology*; D011241:Prednisone / Q000627:therapeutic use*; D012189:Retrospective Studies; D012720:Severity of Illness Index
chemical_list: D000893:Anti-Inflammatory Agents; D007166:Immunosuppressive Agents; D001379:Azathioprine; D011241:Prednisone