13. Cutaneous silent periods in multiple system atrophy

cantly better and the pattern-reversal VEP amplitudes (element size 20’ only) had a similar trend of improvement. However, this effect disappeared after seven weeks when only apheresis treatment was performed. No significant changes in latencies of any of the tested VEP variants were found in relationship to the treatment. Conclusion: This pilot study cannot give a definite view on usefulness of the extended set of VEPs in objective monitoring of GO, it seems that steroid pulse therapy effect is detectable in contrary to no apheresis influence onto the tested electrophysiological parameters. Acknowledgements: Supported by Czech Ministry of Education (VZ0021620816) and by Grant Agency of the Czech Republic 309/ 09/0869.