The inflammatory myopathies are a group of acquired muscle diseases characterized by subacute onset of progressive proximal muscle weakness, elevated serum muscle enzymes and endomysial inflammation. They comprise 3 clinically distinct subsets: polymyositis (PM), dermatomyositis (DM) and Inclusion Body Myositis (IBM). Because immune-mediated mechanisms are primarily responsible for the clinical manifestations of these conditions, the treatment of choice is with corticosteroids or immunotherapy drugs. Although most of the patients initially respond to these drugs, a number of them become resistant or develop unacceptable side effects that necessitate their discontinuation. The need for a more effective and safe immunotherapy in patients with PM, DM or IBM prompted the present study using high dose intravenous immunoglobulin (IVIg). IVIg is an immunomodulating agent which has been shown to be effective and safe in the treatment of a number of patients with immune-related neuromuscular diseases. This is a double-blind, randomized, placebo-controlled study involving 30 patients, who will receive IVIg or placebo for 3 months and then will cross-over to the alternate therapy for another period of 3 monthly infusions. The monthly dose of IVIg is 2 GM/Kg divided into two daily doses. The drug will be considered effective if patients experience an increase of more than 15% in their baseline muscle strength. Muscle strength will be assessed with a series of objective dynamometric measurements performed before and at the end of each monthly infusion.
INCLUSION CRITERIA: Selected patients should have PM, IBM or DM. Specifically they should have a) proximal muscle weakness; b) no evidence of clinical, histological or family history of another neuromuscular illness; c) elevation of muscle enzymes during the course of the disease; d) typical skin rash in case of DM; and e) diagnostic muscle biopsy. Suitable candidates for IVIg should be patients with active, bonefide disease who: 1. have been treated with steroids but had: a) no response or incomplete response (as defined by continued muscle weakness) to high-dose therapy or b) a good response to steroids but inability to taper the dose without a flare of disease activity or c) unacceptable steroid side effects such as gastrointestinal hemorrhages, osteonecrosis, hyperglycemia, extreme weight gain etc., and 2. have been treated with one immunosuppressive drug (such as azathioprine, Methotrexate, Cyclophosphamide, Cyclosporine) but without benefit or with unacceptable side effects. EXCLUSION CRITERIA: Pregnant or nursing women (confirmed by a screening pregnancy test). Critically ill patients such as those requiring intravenous pressors for maintenance of cardiac output due to severe cardiomyopathy, patients with respiratory insufficiency and patients with severe muscle weakness requiring help for basic self care. Children below age 18. Patients with severe renal or hepatic disease, severe COPD or coronary artery disease or other systemic medical problems often seen when PM or DM is associated with severe cases of lupus, rheumatoid arthritis or scleroderma. Patients with known allergic reaction to IVIg. Serum IgA less than 11mg/dl.