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[Anesthetic management of a patient with thrombocytopenia induced by methotrexate undergoing emergent clipping surgery].

A 70-year-old woman underwent emergent clipping surgery for subarachnoid hemorrhage under general anesthesia. Her laboratory data showed thrombocytopenia (4.0 x 10(4) microl(-1)). She had taken prednisolone (3 mg x day(-1)) and methotrexate (MTX) (10 mg x week(-1)) for rheumatoid arthritis for the last 10 years. Anesthesia was induced with remifentanil as well as propofol, maintained with remifentanil and sevoflurane in oxygen. The operation was performed uneventfully without platelet transfusion. Since the cause of thrombocytopenia was suspected to be MTX, we started rescue therapy by calcium folinate postoperatively. Platelet count was normalized two days later (11.6 x 10(4) microl(-1)). One month after the operation, she was discharged uneventfully.