Abstract

In an unselected series of patients with IgA glomerulonephritis, old age, high blood pressure, and high urinary protein excretion at the time of renal biopsy were found to correlate with impaired renal function, whereas sex, estimated duration of the disease, or high serum IgA levels did not. The following clinical features were favorable prognostic signs: asymptomatic proteinuria, macroscopic hematuria, and isolated microscopic hematuria. The degree of diffuse mesangial alteration and the presence of segmental glomerular lesions correlated clearly with the subsequent clinical outcome. Vascular lesions, i.e. arteriosclerosis and renal vascular deposition of C3, were most often present in patients with severe glomerulopathy. The presence of electron-dense deposits in glomerular capillary walls was also an unfavorable prognostic finding. Renal biopsy findings of interstitial infiltrates of inflammatory cells and IgA distributed along glomerular capillary walls were usually associated with extrarenal manifestations of the disease.

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