Tocilizumab improves cardiac disease in a hemodialysis patient with AA amyloidosis secondary to rheumatoid arthritis

摘要

A 58-year-old Japanese woman on hemodialysis (HD) was admitted for intractable rheumatoid arthritis. Even after HD was started due to end-stage renal failure in 2004, her arthropathy worsened. A soluble tumor necrosis factor receptor inhibitor (etanercept at 25mg twice weekly), tacrolimus (2mg daily), and prednisolone (10mg daily) had been administered since 2005, but high disease activity had persisted. She was admitted to our hospital in July 2007. C-reactive protein (CRP) was 6.8mg/dL, and the DAS-CRP score was calculated to be 8.3. The cardiothoracic ratio (CTR) was 62% on a chest radiograph, but dialysis hypotension was remarkable. Left ventricular mass (LVM) was calculated as 320g using echocardiography. Endoscopic biopsy of the stomach and duodenum revealed heavy deposition of AA amyloid. Etanercept was discontinued and tocilizumab was started at a dose of 320mg (8mg/kg) monthly. Even after predonisolone and tacrolimus were tapered gradually and discontinued because of her good response, CRP and DAS-CRP became 0.0mg/dL and 1.5, respectively. In September 2011, re-evaluation was performed. CTR was reduced to 51% and LVM was decreased to 180g. Endoscopic biopsy of the stomach and duodenum revealed disappearance of AA amyloid. Although AA amyloidosis of the gastrointestinal tract has already been reported to be improved by tocilizumab, this is the first report on improvement of myocardial hypertrophy as well as dialysis hypotension.