Acute post-streptococcal glomerulonephritis in adults: a long-term study.

The long-term outcome after acute post-streptococcal glomerulonephritis was studied in 57 patients (52 aged 16 or over) followed for a period of one to 14 years (mean seven years). All patients presented with hypertension, haematuria and proteinuria. The antistreptolysin-0 titre was raised or the serum complement was low in all cases at the initial episode. All patients had histological evidence of a diffuse proliferative and exudative glomerulonephritis at onset. Follow-up renal biopsy was performed in 33 patients; in 18 patients this was carried out five years or more after the initial illness. Five patients died beyond two years, only two having had abnormal renal function at the time or death. Four patients were found to be mildly hypertensive without other clinical abnormalities. Eleven patients had proteinuria, haematuria or abnormal renal function; in three of these repeat renal biopsy was normal, incomplete resolution was reported in five, obsolescent glomeruli in one, and two others were not biopsied. No patient who had normal renal function at the time of follow-up had abnormal renal histology on biopsy. Obsolescent glomeruli were present in two other biopsies in association with evidence of incomplete resolution. It was concluded that the majority of patients with acute PSGN have a good prognosis. Histological resolution of the renal lesion may not occur for nine years.