Abstracts

RATIONALE: Metallic devices generally represent a contra-indication for MRI scanning. Based on laboratory testing, the NCP is labeled MRI compatible when used with a send and receive head coil. However, there are no published clinical data to support the safety of brain MRI in patients with the NCP, and the objective of this case series was to describe such a population. METHODS: We questioned 40 centers that had implanted the NCP System as of 10/1/99. If MRI was performed, we collected information on the patients, the MRI technique, and the events noted during the scan, if any, including both subjective reports (by the patient), and observable (objective) changes noted by the staff. RESULTS: Twelve centers (30%) responded. Over a time period of three years, there were a total of 27 MRI scans performed in 25 patients. All scanners were 1.5 T. A head coil was used in 26 scans, and a body coil in 1. Fourteen patients were males, and ages ranged from one to 52 (mean 24). The indications for the scans were diverse. Some were related to the epilepsy, including etiology or presurgical evaluation. Others were unrelated, including brain tumors, cerebral hematoma, vasculitis, headaches, and head trauma. Three scans were performed with the stimulator on, while 24 were performed with the stimulator off. One patient had a mild objective voice change for several minutes. No other objective changes were noted in any of the patients. One 11-year old reported chest pain while experiencing severe claustrophobia. Twenty-five patients denied any discomfort around the lead or the generator. CONCLUSIONS: This clinical series supports the safety of routine brain MRI using a send and receive head coil in patients implanted with the NCP System.