The natural history of IgA nephritis in Singapore.

The clinical and histological features of 151 patient with IgA nephritis were analyzed to determine the prognostic features of the disease. The mean duration of follow up examinations was 50 +/- 34 months (range 6 to 168 months). The majority of the patients were young males and showed no signs of IgA nephritis. The disease was detected by routine screening before induction into national service. The plot of the reciprocals of serum creatinine against time in the patients with progressive disease showed that the patients ran two different courses when they developed renal impairment; one was a slow progressive course over an average of 7.7 years before reaching end stage renal failure (ESRF), while the other was a more rapid decline to ESRF within an average of 3.3 years in which severe uncontrolled hypertension seemed to be the major adverse factor. Hypertension was present in 23% of patients. Nine percent had renal impairment at the end of the follow up period while 5% progressed to ESRF. The cumulative renal survival was 91% after 6 years with no further development of renal failure up to 14 years. Unfavorable long term prognostic indices were proteinuria of more than 2 gm, hypertension and presence of crescents on renal biopsy.