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We treated 2 patients with IgM monoclonal paraproteinemic demyelinating peripheral neuropathy (PPN) with monthly intravenous human immunoglobulin. Both patients had a steadily progressive course in spite of steroid and other immunosuppressive therapy for 3 years before starting the immunoglobulin therapy. Both had a rapid clinical improvement noticeable 5 to 10 days after the 1st immunoglobulin infusion lasting on the average of 3 to 6 weeks. Retreatment caused improvement after each consecutive infusion. There were no significant adverse side effects. High-dose IV human immunoglobulin can be a useful therapy in the treatment of PPN and warrants a large-scale controlled therapeutic trial.

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