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[Long-term treatment with 7S immunoglobulins in myasthenia gravis. Preliminary clinical results].

After initial high-dose intravenous 7S immunoglobulin therapy, six patients with seropositive myasthenia gravis received intermittent low-dose 7S immunoglobulins for at least 4-12 months. This treatment was started in five cases following an acute exacerbation of myasthenic symptoms (Oosterhuis class 3-4) and in one case because of marked clinical fluctuations (Oosterhuis class 3). In five of the six patients, there was a clinical response to the immunoglobulin therapy within 2 weeks, followed by marked long-standing improvement and stability of the clinical outcome. In four cases a decrease in the titer of acetylcholine receptor antibodies was noted in parallel. Our observations suggest an additional positive therapeutic effect of long-term, low-dose intravenous immunoglobulin therapy following the acute management of myasthenic exacerbations.