Renal manifestations in Henoch-Schönlein purpura: a 10-year clinical study.

Henoch-Schönlein purpura (HSP) is an IgA-mediated systemic small vessel vasculitis of childhood. It is characterized by the symptoms including nonthrombocytopenic purpura, abdominal pain, hematuria/proteinuria, and arthargia/arthritis. We conducted a retrospective study of 261 patients diagnosed with HSP from December 1991 to December 2001. Of the 261 patients, fifty-three (20.3%) developed renal manifestations after onset of the disease. Two patients developed nephrotic syndrome. Four patients had group A beta-hemolytic streptococcal pharyngitis and subsequent depressed serum C3 concentration typical of post streptococcal glomerulonephritis. During the study period, the renal survival rate after disease onset was 100%. The prognosis of renal involvement was better than reports from other series. In this study we also found factors associated with HSP nephritis; these included older age at onset, GI bleeding, and central nervous system involvement. The long-term morbidity of HSP is predominantly attributed to renal involvement. It is thus recommended that patients with HSP nephritis are followed for longer periods of time.