Mesangial proliferative glomerulonephritis in chronic obstructive pulmonary disease.

Ten patients of chronic obstructive pulmonary disease were studied for changes in ultrastructure of the glomeruli, serum immunoglobulin and complement levels. The glomeruli showed proliferation in the mesangium in 90% patients and electron dense deposits in the mesangium in 30% patients. IgA and IgG were usually elevated whereas complements were usually depressed in most of these patients. It is suggested that repeated respiratory infections in these subjects may be responsible for mesangioproliferative type of glomerulonephritis, high IgA and IgG levels. The complements are activated and they take part in immune complex formation getting deposited in mesangium.