Study design: Case report of Baclofen pump catheter failure investigated by radioisotope injection. Objectives: To report a safe and reliable method for evaluating catheter dysfunction. Setting: France. Methods: Single case report of failure of Baclofen pump investigated by radioisotope injection. Results: The injection demonstrated the block in the catheter. The catheter failure was not visualised by plain X-ray nor by ®lling the pump with radio-opaque solution. Conclusion: Catheter failure is a common cause of intrathecal drug delivery problems and may be di cult to diagnose. When catheter disconnection, kink, or dislodgement is not visible on X-ray, radioisotopic control is a safe and reliable method for assessment. Spinal Cord (2001) 39, 283 ± 285
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