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[Intravenous immunoglobulin therapy for Guillain-Barré syndrome in Japan: changes in treatment after its inclusion in health insurance coverage].

In December 2000, health insurance in Japan was instituted for the use of intravenous immunoglobulin (IVIg) therapy for the acute phase of Guillain-Barré syndrome (GBS) that required aid to walk or worse. A nation-wide questionnaire survey was made to investigate the changes in treatment. In September 2002, a letter of inquiry was sent to experienced physicians in 620 teaching hospitals associated with the Societas Neurologica Japonica and 417 associated with the Societas Paediatrica Japonica. Totally, 356 neurologists (57%) and 223 pediatricians (53%) responded. After the introduction of IVIg health insurance coverage, more than 90% thought that GBS patients should be hospitalized and given treatment. The frequency of hospitals with an intensive care unit, however, was 70%. Before IVIg therapy's inclusion in health insurance coverage, many neurologists selected plasmapheresis (88%) rather than IVIg (4%) therapy, whereas pediatricians preferred IVIg (49%) to plasmapheresis (12%). After its inclusion, 75% of neurologists selected IVIg rather than plasmapheresis (21%), whereas pediatricians selected IVIg (86%) over plasmapheresis (5%). In March 2003, new payment system based on Diagnosis Procedure Combination was introduced into 82 large hospitals, and leads to difficulties to select IVIg in the hospitals. The payment system should be revised.