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Cost-effectiveness analysis of intrathecal baclofen therapy in Japan.

Intrathecal baclofen (ITB) therapy was approved for health insurance coverage in 2005 for the treatment of patients whose spasticity could not be adequately controlled by conventional therapy, and is currently being used to treat around 300 patients nationwide in Japan. Various reports have examined the efficacy and safety of ITB therapy, but no report has evaluated the patient quality of life and medical costs in Japan. A cost-utility analysis of ITB was conducted by time period in six severely spastic patients admitted to our university hospital between 2005 and 2010 for ITB therapy. The average cost of ITB therapy per quality-adjusted life year (QALY; number of years survival in perfect health) 5 years after surgery was 1,554,428 yen, below the 6 million yen willingness-to-pay threshold for 1 QALY. This study shows that ITB therapy in Japan is an outstanding treatment in medicoeconomic terms.