Journal
CLINICAL NEUROLOGY AND NEUROSURGERY
Volume 114, Issue 2, Pages 135-141Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clineuro.2011.09.013
Keywords
Externalised SCS; fMRI; MRS; Safety measurements
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Object: Spinal cord stimulation (SCS) is a well-known treatment option for intractable neuropathic pain after spinal surgery, but its pathophysiological mechanisms are poorly stated. The goal of this study is to analyse the feasibility of using brain MRI, functional MRI (fMRI) and Magnetic Resonance Spectroscopy (MRS) as tools to analyse these mechanisms in patients with externalised neurostimulators during trial period. Methods: The authors conducted in an in vitro and in vivo study analysing safety issues when performing brain MRI, fMRI and MRS investigations in human subjects with externalised SCS. Temperature measurements in vitro were performed simulating SCS during MRI sequences using head transmit-receive coils in 1.5 and 3T MRI systems. 40 Patients with externalised SCS were included in the in vivo study. 20 patients underwent brain MRI, fMRI and another 20 patients underwent brain MRI and MRS. Results: A maximal temperature increase of 0.2 degrees C was measured and neither electrode displacements nor hardware failures were observed. None of the patients undergoing the MRS sequences at the 1.5 or 3T MRI scanners described any discomfort or unusual sensations. Conclusion: We can conclude that brain MRI, fMRI and MRS studies performed in patients with externalised SCS can be safely executed. (C) 2011 Elsevier B.V. All rights reserved.
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