Improved prognosis of renal microscopic polyarteritis in recent years.

To determine if the short- and long-term prognosis of renal micropolyarteritis (including Wegener's granulomatosis) had improved in our Unit in the last 5 years compared to our previous series from 1965 to 1980, we examined data from 26 recent patients, 1981-1986. Twenty were admitted during acute phase and six after a mean of 7.1 months of disease. The acute phase showed mild to severe impairment of renal function, and renal biopsies showed necrotising glomerulitis in all acute patients with extensive crescents in 67%. Acute patients (20) were treated with 'aggressive' immunosuppression including i.v. methylprednisolone (15), plasmapheresis (seven) and cyclophosphamide (ten). Chronic immunosuppressive treatment was continued in most patients. In the 20 acute-onset patients, life survival at 2 and 5 years was 77%; four of five deaths occurred during the acute phase in aged patients with severe renal failure. The notable improvement in life and kidney survival (only one patient underwent chronic dialysis) probably resulted from greater awareness of vasculitis in general practice with early referral of patients to specialised units, and to more aggressive treatment.