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Intern Med. 2012;51(18):2587-90. Epub 2012 Sep 15.

Rapidly progressive glomerulonephritis associated with PR3-ANCA positive subacute bacterial endocarditis.

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Renal Division, Department of Internal Medicine, Iwata City Hospital, Japan.


Patients with bacterial endocarditis often have renal complications. This report presents the case of an elderly man with rapidly progressive glomerulonephritis (RPGN) associated with subacute bacterial endocarditis (SBE) due to Enterococcus faecalis infection. The patient was positive for anti-proteinase 3-antineutrophil cytoplasmic antibody (PR3-ANCA) and rheumatoid factor (RF) with hypocomplementemia. Treatment for SBE with antibiotics and the surgical replacement of the affected valves resulted in an improvement of RPGN, the disappearance of PR3-ANCA and RF, and the normalization of hypocomplementemia. This rare case suggests the importance of recognizing the cause of positive PR3-ANCA, because SBE could be an occult cause of RPGN mimicking ANCA-associated vasculitis.

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